METHACRYLIC ACID

Methacrylic acid is used as a thermosetting acrylic resin comonomer, a carboxylated comonomer, in various methacrylate resins and plastics, in engineering adhesives, and for organic synthesis (Ashford, 1994) Budavari, 1989; (Hathaway et al, 1991; Lewis, 1993).

FORMS

To prevent polymerization, commercially available grades generally contain p-methoxyphenol (0.025%) or hydroquinone (1000 ppm) and hydroquinone monomethyl ether (250 ppm) (Ashford, 1994) CHRIS, 1996; (NIOSH , 1996).
Commercially available grades (CHRIS, 1996):

99% plus
98% plus (glacial)
85% (crude monomer)
40% aqueous solution

-CLINICAL EFFECTS

GENERAL CLINICAL EFFECTS

Methacrylic acid is corrosive to the skin, eyes, and mucous membranes and causes severe eye and skin burns. Direct eye contact may cause blindness.

Inhalation may cause nausea, vomiting, headache, dizziness, confusion, and loss of consciousness.

EKG changes, decreased heart rate, and an increased respiratory rate have been noted in experimental animals.

POTENTIAL HEALTH HAZARDS - EMERGENCY RESPONSE GUIDEBOOK, GUIDE 153 (ERG, 2004)

TOXIC; inhalation, ingestion or skin contact with material may cause severe injury or death.
Contact with molten substance may cause severe burns to skin and eyes.
Avoid any skin contact.
Effects of contact or inhalation may be delayed.
Fire may produce irritating, corrosive and/or toxic gases.
Runoff from fire control or dilution water may be corrosive and/or toxic and cause pollution.

-MEDICAL TREATMENT

LIFE SUPPORT

Support respiratory and cardiovascular function.

SUMMARY

FIRST AID - EMERGENCY RESPONSE GUIDEBOOK, GUIDE 153 (ERG, 2004)

Move victim to fresh air.
Call 911 or emergency medical service.
Give artificial respiration if victim is not breathing.
Do not use mouth-to-mouth method if victim ingested or inhaled the substance; give artificial respiration with the aid of a pocket mask equipped with a one-way valve or other proper respiratory medical device.
Administer oxygen if breathing is difficult.
Remove and isolate contaminated clothing and shoes.
In case of contact with substance, immediately flush skin or eyes with running water for at least 20 minutes.
For minor skin contact, avoid spreading material on unaffected skin.
Keep victim warm and quiet.
Effects of exposure (inhalation, ingestion or skin contact) to substance may be delayed.
Ensure that medical personnel are aware of the material(s) involved and take precautions to protect themselves.

FIRST AID

FIRST AID

EYE EXPOSURE - Immediately wash the eyes with large amounts of water, occasionally lifting the lower and upper lids. Get medical attention immediately. Contact lenses should not be worn when working with this chemical.
DERMAL EXPOSURE - Immediately flush the contaminated skin with water. If this chemical penetrates the clothing, immediately remove the clothing and flush the skin with water. Get medical attention promptly.
INHALATION EXPOSURE - Move the exposed person to fresh air at once. If breathing has stopped, perform artificial respiration. Keep the affected person warm and at rest. Get medical attention as soon as possible.
ORAL EXPOSURE - If this chemical has been swallowed, get medical attention immediately.
TARGET ORGANS - Eyes, skin, and respiratory system (National Institute for Occupational Safety and Health, 2007).

GENERAL

Move victims of inhalation exposure from the toxic environment and administer 100% humidified supplemental oxygen with assisted ventilation as required. Exposed skin and eyes should be copiously flushed with water. Because of the potential for rapid onset of CNS depression or seizures with possible aspiration of gastric contents, EMESIS SHOULD NOT BE INDUCED. Cautious gastric lavage followed by administration of activated charcoal may be of benefit if the patient is seen soon after the exposure.

INHALATION EXPOSURE

INHALATION: Move patient to fresh air. Monitor for respiratory distress. If cough or difficulty breathing develops, evaluate for respiratory tract irritation, bronchitis, or pneumonitis. Administer oxygen and assist ventilation as required. Treat bronchospasm with an inhaled beta2-adrenergic agonist. Consider systemic corticosteroids in patients with significant bronchospasm.
If bronchospasm and wheezing occur, consider treatment with inhaled sympathomimetic agents.

DERMAL EXPOSURE

DECONTAMINATION: Remove contaminated clothing and jewelry and place them in plastic bags. Wash exposed areas with soap and water for 10 to 15 minutes with gentle sponging to avoid skin breakdown. A physician may need to examine the area if irritation or pain persists (Burgess et al, 1999).
Treat dermal irritation or burns with standard topical therapy. Patients developing dermal hypersensitivity reactions may require treatment with systemic or topical corticosteroids or antihistamines.

EYE EXPOSURE

DECONTAMINATION: Remove contact lenses and irrigate exposed eyes with copious amounts of room temperature 0.9% saline or water for at least 15 minutes. If irritation, pain, swelling, lacrimation, or photophobia persist after 15 minutes of irrigation, the patient should be seen in a healthcare facility.

ORAL EXPOSURE

Because of the potential for gastrointestinal tract irritation or CNS depression do not induce emesis.
DILUTION: If no respiratory compromise is present, administer milk or water as soon as possible after ingestion. Dilution may only be helpful if performed in the first seconds to minutes after ingestion. The ideal amount is unknown; no more than 8 ounces (240 mL) in adults and 4 ounces (120 mL) in children is recommended to minimize the risk of vomiting.
Significant esophageal or gastrointestinal tract irritation or burns may occur following ingestion. The possible benefit of early removal of some ingested material by cautious gastric lavage must be weighed against potential complications of bleeding or perforation.
GASTRIC LAVAGE: Consider after ingestion of a potentially life-threatening amount of poison if it can be performed soon after ingestion (generally within 1 hour). Protect airway by placement in the head down left lateral decubitus position or by endotracheal intubation. Control any seizures first.

CONTRAINDICATIONS: Loss of airway protective reflexes or decreased level of consciousness in unintubated patients; following ingestion of corrosives; hydrocarbons (high aspiration potential); patients at risk of hemorrhage or gastrointestinal perforation; and trivial or non-toxic ingestion.

ACTIVATED CHARCOAL: Administer charcoal as a slurry (240 mL water/30 g charcoal). Usual dose: 25 to 100 g in adults/adolescents, 25 to 50 g in children (1 to 12 years), and 1 g/kg in infants less than 1 year old.
Observe patients with ingestion carefully for the possible development of esophageal or gastrointestinal tract irritation or burns. If signs or symptoms of esophageal irritation or burns are present, consider endoscopy to determine the extent of injury.

-RANGE OF TOXICITY

MINIMUM LETHAL EXPOSURE

GENERAL/SUMMARY

The minimum lethal human dose to this agent has not been delineated.

MAXIMUM TOLERATED EXPOSURE

GENERAL/SUMMARY

The maximum tolerated human exposure to this agent has not been delineated.
Airborne concentrations of up to 113 ppm of methacrylic acid in a manufacturing facility produced skin toxicity and one corneal burn; no respiratory tract symptoms were reported (ACGIH, 1991).

ANIMAL DATA

Animal experiments have demonstrated that direct ocular contact with liquid methacrylic acid can cause blindness. Skin contact may result in dermal corrosion (ACGIH, 1991; Clayton & Clayton, 1994).

Carcinogenicity Ratings for CAS79-41-4 :

ACGIH (American Conference of Governmental Industrial Hygienists, 2010): Not Listed ; Listed as: Methacrylic acid
EPA (U.S. Environmental Protection Agency, 2011): Not Listed
IARC (International Agency for Research on Cancer (IARC), 2016; International Agency for Research on Cancer, 2015; IARC Working Group on the Evaluation of Carcinogenic Risks to Humans, 2010; IARC Working Group on the Evaluation of Carcinogenic Risks to Humans, 2010a; IARC Working Group on the Evaluation of Carcinogenic Risks to Humans, 2008; IARC Working Group on the Evaluation of Carcinogenic Risks to Humans, 2007; IARC Working Group on the Evaluation of Carcinogenic Risks to Humans, 2006; IARC, 2004): Not Listed
NIOSH (National Institute for Occupational Safety and Health, 2007): Not Listed ; Listed as: Methacrylic acid
MAK (DFG, 2002): Not Listed
NTP (U.S. Department of Health and Human Services, Public Health Service, National Toxicology Project ): Not Listed

TOXICITY AND RISK ASSESSMENT VALUES

EPA IRIS

EPA Risk Assessment Values for CAS79-41-4 (U.S. Environmental Protection Agency, 2011):

Not Listed

TOXICITY VALUES

References: ACGIH, 1991 Clayton & Clayton, 1994 ITI, 1988 Lewis, 1996 RTECS, 1996 Note: Unless otherwise noted all data is from RTECS.
- LD50- (SKIN)GUINEA_PIG:
- LD50- (INTRAPERITONEAL)MOUSE:
- LD50- (ORAL)MOUSE:
- LD50- (ORAL)RABBIT:
- LD50- (SKIN)RABBIT:
- LD50- (ORAL)RAT:
- TCLo- (INHALATION)MOUSE:
- TCLo- (INHALATION)RAT:

CALCULATIONS

AMBIENT CONVERSIONS

CONVERSION FACTORS

1 ppm = 3.58 mg/m(3) (760 mmHg at 68 degrees C) (NIOSH , 1996)

-STANDARDS AND LABELS

WORKPLACE STANDARDS

ACGIH TLV Values for CAS79-41-4 (American Conference of Governmental Industrial Hygienists, 2010):

Editor's Note: The listed values are recommendations or guidelines developed by ACGIH(R) to assist in the control of health hazards. They should only be used, interpreted and applied by individuals trained in industrial hygiene. Before applying these values, it is imperative to read the introduction to each section in the current TLVs(R) and BEI(R) Book and become familiar with the constraints and limitations to their use. Always consult the Documentation of the TLVs(R) and BEIs(R) before applying these recommendations and guidelines.

Adopted Value

Methacrylic acid

TLV:

TLV-TWA: 20 ppm
TLV-STEL:
TLV-Ceiling:

Notations and Endnotes:

Carcinogenicity Category: Not Listed
Codes: Not Listed
Definitions: Not Listed

TLV Basis - Critical Effect(s): Skin and eye irr
Molecular Weight: 86.09

For gases and vapors, to convert the TLV from ppm to mg/m(3):

[(TLV in ppm)(gram molecular weight of substance)]/24.45

For gases and vapors, to convert the TLV from mg/m(3) to ppm:

[(TLV in mg/m(3))(24.45)]/gram molecular weight of substance

AIHA WEEL Values for CAS79-41-4 (AIHA, 2006):

Not Listed

NIOSH REL and IDLH Values for CAS79-41-4 (National Institute for Occupational Safety and Health, 2007):

Listed as: Methacrylic acid
REL:

TWA: 20 ppm (70 mg/m(3))
STEL:
Ceiling:
Carcinogen Listing: (Not Listed) Not Listed
Skin Designation: [skin]

Indicates the potential for dermal absorption; skin exposure should be prevented as necessary through the use of good work practices and gloves, coveralls, goggles, and other appropriate equipment.

Note(s):

IDLH: Not Listed

OSHA PEL Values for CAS79-41-4 (U.S. Occupational Safety, and Health Administration (OSHA), 2010):

Not Listed

OSHA List of Highly Hazardous Chemicals, Toxics, and Reactives for CAS79-41-4 (U.S. Occupational Safety and Health Administration, 2010):

Not Listed

ENVIRONMENTAL STANDARDS

EPA CERCLA, Hazardous Substances and Reportable Quantities for CAS79-41-4 (U.S. Environmental Protection Agency, 2010):

Not Listed

EPA CERCLA, Hazardous Substances and Reportable Quantities, Radionuclides for CAS79-41-4 (U.S. Environmental Protection Agency, 2010):

Not Listed

EPA RCRA Hazardous Waste Number for CAS79-41-4 (U.S. Environmental Protection Agency, 2010b):

Not Listed
Editor's Note: The D, F, and K series waste numbers and Appendix VIII to Part 261 -- Hazardous Constituents were not included. Please refer to 40 CFR Part 261.

EPA SARA Title III, Extremely Hazardous Substance List for CAS79-41-4 (U.S. Environmental Protection Agency, 2010):

Not Listed

EPA SARA Title III, Community Right-to-Know for CAS79-41-4 (40 CFR 372.65, 2006; 40 CFR 372.28, 2006):

Not Listed

DOT List of Marine Pollutants for CAS79-41-4 (49 CFR 172.101 - App. B, 2005):

Not Listed

EPA TSCA Inventory for CAS79-41-4 (EPA, 2005):

Listed as: 2-Propenoic acid, 2-methyl-

SHIPPING REGULATIONS

SURFACE

DOT -- Table of Hazardous Materials and Special Provisions for UN/NA Number 2531 (49 CFR 172.101, 2005):

Hazardous materials descriptions and proper shipping name: Methacrylic acid, stabilized

Symbol(s): Not Listed
Hazard class or Division: 8

8: Corrosive material. See 49 CFR section 173.136 for definitions.

Identification Number: UN2531
Packing Group: II

II: Packing Group II - indicates the degree of danger presented by the material is medium.

Label(s) required (if not excepted): 8

8: Corrosive.

Special Provisions: IB2, T7, TP1, TP18, TP30

IB2: Authorized IBCs: Metal (31A, 31B and 31N); Rigid plastics (31H1 and 31H2); Composite (31HZ1). Additional Requirement: Only liquids with a vapor pressure less than or equal to 110 kPa at 50 °C (1.1 bar at 122 °F), or 130kPa at 55 °C (1.3 bar at 131 °F) are authorized.
T7: Minimum test pressure (bar): 4; Minimum shell thickness (in mm-reference steel) (See sxn.178.274(d)): sxn.178.274(d)(2); Pressure-relief requirements (See sxn.178.275(g)): Normal; Bottom opening requirements (See sxn.178.275(d)): sxn.178.275(d)(3).
TP1: The maximum degree of filling must not exceed the degree of filling determined by the following: [Degree of filling = 97/1+alpha(tr - tf)], where tr is the maximum mean bulk temperature during transport, and tf is the temperature in degrees celsius of the liquid during filling.
TP18: The temperature of this material must be maintained between 18 °C (64.4 °F) and 40 °C (104 °F) while in transportation. Portable tanks containing solidified methacrylic acid must not be reheated during transportation.
TP30: This hazardous material may only be transported in insulated tanks.

Packaging Authorizations (refer to 49 CFR 173.***):

Exceptions: 154
Non-bulk packaging: 202
Bulk packaging: 242

Quantity Limitations:

Passenger aircraft or railcar: 1 L
Cargo aircraft only: 30 L

Vessel Stowage Requirements:

Vessel stowage location: C

C: The material must be stowed "on deck only" on a cargo vessel and on a passenger vessel.

Vessel stowage other: 40

40: Stow "clear of living quarters".

ICAO International Shipping Name for UN2531 (ICAO, 2002):

Proper Shipping Name: Methacrylic acid, stabilized
UN Number: 2531

LABELS

NFPA

NFPA Hazard Ratings for CAS79-41-4 (NFPA, 2002):

Listed as: Methacrylic Acid
Hazard Ratings:

Health Rating (Blue): 3

(3) Seriously toxic material. Short term exposure could cause serious temporary or residual injury even though prompt medical treatment is given. Includes known or suspect small animal carcinogens, mutagens, or teratogens.

Flammability Rating (Red): 2

(2) Combustible. Materials that must be moderately heated before ignition can occur. Including liquids having a flash point above 100 degrees F, and solids that readily give off flammable vapors.

Instability Rating (Yellow): 2

(2) Materials which in themselves are normally unstable and readily undergo violent chemical change, but do not detonate. This rating includes materials which may react violently with water or which may form potentially explosive mixtures with water.

Oxidizer/Water-Reactive Designation: Not Listed

-HANDLING AND STORAGE

HANDLING

Methacrylic acid is stable during transport, if stored away from heat (CHRIS, 1996; (HSDB , 1996).

Broken packages/containers should not be handled unless by persons outfitted with appropriate protective clothing (AAR, 1994).

According to 49 CFR 171.2: "No person may /transport,/ offer or accept a hazardous material for transportation in commerce unless that material is properly classed, described, packaged, marked, labeled, and in condition for shipment as required or authorized by.../the hazardous materials regulations (49 CFR 171 to 177)" (HSDB , 1996).

STORAGE

CONTAINER

Glass bottles and carboys as well as lined drums and tankers are the usual shipping containers (NFPA, 1994).

ROOM/CABINET RECOMMENDATIONS

Store methacrylic acid in a dry, cool, well-ventilated place (ITI, 1988; NFPA, 1994).
- Storage facilities removed from residential districts are optimal (ITI, 1988).
Store at ambient temperature (CHRIS, 1996).
The uninhibited vapor can form the polymer in confined areas (i.e., vents) (NFPA, 1994).

INCOMPATIBILITIES

This compound is a storage hazard, as it may spontaneously, exothermically polymerize (Lewis, 1996).
Keep it separated from peroxides, oxidizers, or other initiators (e.g., open flame, elevated temperatures, or sunlight) (NFPA, 1994).
- Methacrylic acid, with or without an inhibitor, can be stored safely for extended periods if the temperature remains below its melting point (16 degrees C) (ITI, 1988).
Protect from physical damage. Keep separated from all other storage (ITI, 1988).

-PERSONAL PROTECTION

SUMMARY

RECOMMENDED PROTECTIVE CLOTHING - EMERGENCY RESPONSE GUIDEBOOK, GUIDE 153 (ERG, 2004)

Wear positive pressure self-contained breathing apparatus (SCBA).
Wear chemical protective clothing that is specifically recommended by the manufacturer. It may provide little or no thermal protection.
Structural firefighters' protective clothing provides limited protection. fire situations ONLY; it is not effective in spill situations where direct contact with the substance is possible.

Appropriate protective clothing should be worn to prevent skin contact. Wash the skin, with large amounts of soap and water, immediately after it becomes contaminated. Clothing which becomes wet should be removed as quickly as possible. Workers need to change into uncontaminated clothing before leaving the job site (AAR, 1994; (NIOSH , 1996).

"SRP: Contaminated protective clothing should be segregated in such a manner so that there is no direct personal contact by personnel who handle, dispose, or clean the clothing. Quality assurance to ascertain the completeness of the cleaning procedures should be implemented before the decontaminated protective clothing is returned for reuse by the workers. Contaminated clothing should not be taken home at end of shift, but should remain at employee's place of work for cleaning." (HSDB , 1996)

EYE/FACE PROTECTION

Use appropriate eye protection to prevent contact. In areas where there is any possibility that persons may be exposed to methacrylic acid, eyewash fountains should be provided (NIOSH , 1996).

RESPIRATORY PROTECTION

Refer to "Recommendations for respirator selection" in the NIOSH Pocket Guide to Chemical Hazards on TOMES Plus(R) for respirator information.

PROTECTIVE CLOTHING

CHEMICAL PROTECTIVE CLOTHING. Search results for CAS 79-41-4.

All data are compiled from published sources and are NOT recommended specifically by Truven Health Analytics. The appearance of specific manufacturers or products in this section does not represent an endorsement by Truven Health Analytics. No attempt has been made to verify the data presented. All product recommendations should be confirmed with the specific manufacturer for verification of product performance.
CLOTHING

Neoprene

River City

Neoprene splash suits

Degradation Rating: Not Recommended
Breakthrough Time (minutes): Not Listed
Permeation Rate (mcg/cm2/min): Not Listed
Notes: Not Listed
Citation: (River City, 1995)

Plastic Laminate

DuPont Personal Protection

Responder

Degradation Rating: No Degradation Rating provided
Breakthrough Time (minutes): >480
Permeation Rate (mcg/cm2/min): None detected
Notes: Not Listed
Citation: (DuPont, 2002)

Responder Plus

Degradation Rating: No Degradation Rating provided
Breakthrough Time (minutes): >480
Permeation Rate (mcg/cm2/min): None detected
Notes: Not Listed
Citation: (DuPont, 2002)

Tychem 10,000

Degradation Rating: No Degradation Rating provided
Breakthrough Time (minutes): >480
Permeation Rate (mcg/cm2/min): <0.001
Notes: liquid
Citation: (DuPont, 2002)

Tychem 7500

Degradation Rating: No Degradation Rating provided
Breakthrough Time (minutes): Not Tested
Permeation Rate (mcg/cm2/min): Not Tested
Notes: liquid
Citation: (DuPont, 2002)

Tychem 9400

Degradation Rating: No Degradation Rating provided
Breakthrough Time (minutes): >480
Permeation Rate (mcg/cm2/min): <0.01
Notes: liquid
Citation: (DuPont, 2002)

Tychem BR

Degradation Rating: No Degradation Rating provided
Breakthrough Time (minutes): >480
Permeation Rate (mcg/cm2/min): <0.01
Notes: Not Listed
Citation: (DuPont, 2002)

Tychem LV

Degradation Rating: Not Listed
Breakthrough Time (minutes): >480
Permeation Rate (mcg/cm2/min): <0.01
Notes: Not Listed
Citation: (DuPont, 2003)

Tychem QC

Degradation Rating: No Degradation Rating provided
Breakthrough Time (minutes): Not Tested
Permeation Rate (mcg/cm2/min): Not Tested
Notes: liquid
Citation: (DuPont, 2002)

Tychem SL

Degradation Rating: No Degradation Rating provided
Breakthrough Time (minutes): Not Tested
Permeation Rate (mcg/cm2/min): Not Tested
Notes: liquid
Citation: (DuPont, 2002)

Tychem ThermoPro

Degradation Rating: No Degradation Rating provided
Breakthrough Time (minutes): >480
Permeation Rate (mcg/cm2/min): <0.0001
Notes: Not Listed
Citation: (DuPont, 2003)

Tychem TK

Degradation Rating: No Degradation Rating provided
Breakthrough Time (minutes): >480
Permeation Rate (mcg/cm2/min): <0.01
Notes: Not Listed
Citation: (DuPont, 2002)
Degradation Rating: No Degradation Rating provided
Breakthrough Time (minutes): >480
Permeation Rate (mcg/cm2/min): <0.01
Notes: liquid
Citation: (DuPont, 2002)

Polyvinyl Chloride

River City

PVC splash suits

Degradation Rating: Not Recommended
Breakthrough Time (minutes): Not Listed
Permeation Rate (mcg/cm2/min): Not Listed
Notes: Not Listed
Citation: (River City, 1995)

FOOTWEAR

Specific recommendations and test data for this product type were not found in the available manufacturers' product literature.

GLOVES

Butyl

North Safety Products

Butyl Series

Degradation Rating: Good
Breakthrough Time (minutes): >480
Permeation Rate (mcg/cm2/min): None Detected
Notes: Not Listed
Citation: (North, 2002)

Nitrile

North Safety Products

Nitrile Series

Degradation Rating: Poor
Breakthrough Time (minutes): 102
Permeation Rate (mcg/cm2/min): 23000
Notes: Not Listed
Citation: (North, 2002)

Plastic Laminate

North -- Safety 4H

Degradation Rating: No Degradation Rating provided
Breakthrough Time (minutes): >240
Permeation Rate (mcg/cm2/min): Not reported
Notes: tested at 35 degrees C; 95 degrees F
Citation: (Safety 4, 2002)
Degradation Rating: No Degradation Rating provided
Breakthrough Time (minutes): >480
Permeation Rate (mcg/cm2/min): Not reported
Notes: tested at 21 degrees C; 70 degrees F
Citation: (Safety 4, 2002)

Viton

North Safety Products

Viton Series

Degradation Rating: Excellent
Breakthrough Time (minutes): >480
Permeation Rate (mcg/cm2/min): None Detected
Notes: Not Listed
Citation: (North, 2002)

GENERAL INFORMATION

This section provides a compilation of chemical resistance information and test data for specific protective clothing products. Chemical resistance information includes both degradation resistance ratings and permeation resistance data. This information is designed to assist in the selection of appropriate protective clothing. Only data on specific products and manufacturers are included. Generic information or recommendations are not provided since significant differences can exist in the chemical resistance for apparent similar product types.
Specific product information is organized by general product type (gloves, garments, and footwear), material type, and manufacturer. The category 'garments' may include totally encapsulating suits, splash suits, as well as other items (e.g., coveralls, jackets, and aprons). Specific manufacturers should be contacted to determine the features of available styles/models.
In addition to chemical resistance information, there are many critical variables in the selection of protective clothing which cannot be represented in this summary of the literature. Some factors to be considered in choosing protective clothing include, but are not limited to: overall clothing integrity, physical hazard resistance, durability, human factors, ease of decontamination, and cost. Overall clothing integrity refers to a specific design's ability to offer consistent protection for all clothing-covered areas of the body. Physical hazards include resisting the effects of abrasion, cuts, tears, and punctures. Human factors entail effects on wearer mobility, visibility, and hearing for garments; dexterity, tactility, and grip for gloves; ankle support and weight for footwear; and, any effect of the clothing on the function of the wearer. There are several variations in the design for gloves, garments, and footwear that affect these factors. Protective clothing must properly be sized and correctly fit the wearer to ensure its proper use and function.
As required in the U.S.A., protective clothing should be selected based on a risk assessment of the workplace. This risk assessment must account for the identification of existing as well as potential hazards and involve the recommendation of protective clothing appropriate for the identified hazards. Therefore, the recommendations in this section should not be used as the sole basis for decisions on choice of protective clothing, but rather should be used as a tool by qualified occupational health and safety professionals or other technically qualified persons in conjunction with a review of all mitigating factors. Consult the OSHA PPE Standard (29 CFR 1910.132 - 1910.138) for regulations and additional guidance regarding the selection and use of protective clothing and equipment. For general information on protective clothing selection, refer to the "PERSONAL PROTECTIVE EQUIPMENT - OSHA PUB 3077" document.
PROTECTIVE CLOTHING SELECTION

Determine the type of protective clothing item needed based on a risk assessment (e.g., gloves, garments, footwear).
For high risk situations, choose clothing that covers all parts of the body that may be exposed. In many cases, multiple clothing items will be required. Low risk situations may permit partial body protective clothing. Select protective clothing products that have reported chemical resistance data. High risk situations involving full body clothing or extended chemical contact often require permeation resistance data to determine the barrier effectiveness of materials used in the construction of clothing. Relatively low risk situations, where only splash or incidental exposure occur, may allow use of protective clothing based on degradation or penetration resistance data. Specifics on the interpretation of chemical resistance data are presented below.
Other factors must be considered in addition to chemical resistance. The selected chemical protective clothing item should offer the optimal combination of protection against identified hazards while allowing maximum function and comfort.

INTERPRETATION OF DEGRADATION RATINGS

Degradation refers to physical changes in a material as the result of chemical exposure. Degradation may become evident in visible changes, such as discoloration, swelling, delamination, deterioration, or disintegration. Degradation effects may also be measured by weight change or other changes in a material's physical properties (e.g., strength, elasticity, hardness).
Degradation resistance ratings are provided by manufacturers to rate the amount of degradation that occurs for a particular protective clothing material when contacted by a chemical. All degradation ratings are qualitative and include ratings, such as "EXCELLENT," "GOOD," "FAIR," "POOR," and "NOT RECOMMENDED." There is no standard test method for the measurement of chemical degradation resistance; therefore, manufacturer ratings may be based on different testing approaches. This makes comparison of degradation ratings between manufacturers unreliable.
The use of degradation resistance ratings alone to recommend protective clothing, particularly for high hazard situations, should be avoided. Degradation resistance testing does not directly assess the barrier quality of protective clothing, since materials can show relatively little degradation but still allow either permeation or penetration by a chemical. Degradation resistance ratings can be used to exclude protective clothing materials from consideration. Protective clothing materials with a "NOT RECOMMENDED" degradation resistance rating should never be used.
For some products, the rating "NO PENETRATION" is provided. This refers to penetration resistance test results that are based on a different procedure (American Society for Testing and Materials (ASTM) Standard Test Method F 903). Penetration resistance testing involves placing a material sample in a test cell, exposing the exterior side of the material to a chemical, and then observing the interior side of the material for visible signs of liquid penetration. Part of the test is conducted at an elevated pressure. Test results are reported as pass (no penetration) or fail (penetration detected). Unlike degradation testing, penetration testing provides an assessment of protective clothing material barrier performance. Since penetration resistance testing examines only observable amounts of liquid penetration, permeation may still occur. The use of penetration resistance data must be restricted to liquid chemicals, and should be limited to scenarios where there is no reasonable vapor exposure hazard under the conditions of exposure.

INTERPRETATION OF PERMEATION DATA

Permeation is the process of chemical movement through a material on a molecular level. Permeation resistance refers to the ability of a material to retard or prevent chemical movement through it. Permeation may occur without any visible signs of degradation.
Permeation resistance is measured using a test cell which is divided into two halves by a protective clothing specimen. Chemical is placed on the challenge side, while the collection side is periodically monitored for permeating chemical. Permeation data were obtained in accordance with the American Society for Testing and Materials (ASTM) Standard Test Method F 739 (Resistance of Materials Used in Protective Clothing to Permeation by Liquids and Gases), unless stated otherwise. In the case of chemicals that are classified as warfare agents, the data were obtained in accordance with the Military Standard 282 (MIL-STD-282) (Military Standard, Filter Units, Protective Clothing, Gas-Mask Components, and Related Products: Performance Test Methods).
Permeation rate is the amount of chemical that passes through a material for a measured surface area per unit time. In this section, permeation rate is expressed in micrograms per square centimeter per minute (mcg/cm(2)/min). The reported permeation rate is either the steady-state rate or the maximum rate observed during testing. In some cases, very large permeation rates exceed measurement techniques and are reported as ">" (greater than) or "HIGH."
Breakthrough time is the elapsed time, in minutes, from the time the chemical comes in contact with the material exterior surface, to the time that chemical is detected on the interior surface. When no breakthrough is detected, the breakthrough time is report as ">" the testing period. If permeation breakthrough is rapid, results are reported as "<" (less than) the earlier sampling time or as "IMMEDIATELY" (which usually means breakthrough in less than 4 minutes).
The breakthrough time should exceed the expected use period of the selected protective clothing. Additionally, there are several other factors that must be taken into account to provide appropriate protection.
Permeation testing is usually conducted with full strength, undiluted chemical for the duration of the test period. Actual exposures may involve diluted chemical for short or intermittent exposure periods.
Permeation testing is usually conducted at room temperature. Permeation occurs faster at elevated temperatures (short breakthrough times and higher permeation rates) and slower at reduced temperatures (long breakthrough times and lower permeation rates).
Permeation resistance of mixtures cannot usually be determined on the basis of the individual chemicals making up the mixture. Synergistic effects may occur and result in more rapid permeation than accounted for by the individual mixture chemicals.
Permeation rates may be used to calculate potential wearer exposure; however, several assumptions must be made about the extent of exposure and condition of clothing wear. Furthermore, there are few chemicals with dermal exposure limits, making it difficult to determine an acceptable skin exposure level.

COMPANY INFORMATION

DuPont Personal Protection P. O. Box 80705 Wilmington, DE 19880-0705 USA Phone: (302) 774-1000 Toll-Free: (800) 931-3456 Website: http://personalprotection.dupont.com Email: personalprotection@usa.dupont.com
North -- Safety 4H 2000 Plainfield Pike Cranston, RI 02921 USA Phone: (800) 430-4110 Fax: (800) 572-6346 Toll-Free: (800) 430-4110 Website: http://www.safety4.com
North Safety Products 2000 Plainfield Pike Cranston, RI 02921 USA Phone: (800) 430-4110 Fax: (800) 572-6346 Toll-Free: (800) 430-4110 Website: http://www.northsafety.com Email: marketing@northsafety.com
River City 5321 East Shelby Dr. Memphis, TN 38188 USA Phone: (800) 888-0347 Fax: (901) 795-3815 Toll-Free: (800) 888-0347 Website: http://www.protectivewear.com Email: support@protectivewear.com

REFERENCES

CHEMICAL PROTECTIVE CLOTHING CITATIONS

The following sources were consulted for chemical protective clothing data:

(Ansell-Edmont, 2001)
(Bata Shoe Company, 1995)
(Best Manufacturing, 2002)
(Best Manufacturing, 2004)
(Boss Manufacturing Company, 1998)
(ChemFab Corporation, 1993)
(Comasec Safety, Inc., 2003)
(Comasec Safety, Inc., 2003a)
(DuPont, 2002)
(DuPont, 2002)
(DuPont, 2003)
(Guardian Manufacturing Group, 2001)
(ILC Dover, Inc., 1998)
(Kappler Inc., 2001)
(Kimberly-Clark, 2002)
(LaCrosse-Rainfair, 1997)
(MAPA Professional, 2003)
(MAPA Professional, 2004)
(Mar-Mac Manufacturing, Inc, 1995)
(Marigold Industrial, 2003)
(Memphis Glove Company, 2001)
(Montgomery Safety Products, 1995)
(Nat-Wear, 2001)
(Neese Industries, Inc., 2003)
(North, 2002)
(North, 2002)
(Playtex, 1995)
(River City, 1995)
(Safety 4, 2002)
(Servus, 1995)
(Standard Safety Equipment, 1995)
(Tingley, 2002)
(Trelleborg-Viking, Inc., 2001)
(Trelleborg-Viking, Inc., 2002)
(Wells Lamont Industrial, 2002)
(Workrite, 1997)

-PHYSICAL HAZARDS

FIRE HAZARD

SUMMARY

POTENTIAL FIRE OR EXPLOSION HAZARDS - EMERGENCY RESPONSE GUIDEBOOK, GUIDE 153 (ERG, 2004)
- Combustible material: may burn but does not ignite readily.
- When heated, vapors may form explosive mixtures with air: indoors, outdoors and sewers explosion hazards.
- Those substances designated with a "P" may polymerize explosively when heated or involved in a fire.
- Contact with metals may evolve flammable hydrogen gas.
- Containers may explode when heated.
- Runoff may pollute waterways.
- Substance may be transported in a molten form.
Methacrylic acid is a combustible liquid; it is a fire hazard when exposed to heat, open flame, or oxidizing materials. The vapor forms explosive mixtures with air (CHRIS, 1996; (Lewis, 1996; NFPA, 1994; NIOSH , 1996).
Toxic gases (including carbon monoxide) may be produced in a fire involving methacrylic acid or when it is heated to decomposition (AAR, 1994; CHRIS, 1996; (Lewis, 1996; NFPA, 1994).
Spontaneous exothermic polymerization may occur; this reaction is potentially explosive (Lewis, 1996; NFPA, 1994).
Polymerization can be triggered by sunlight, elevated temperature, as well as contact with peroxides and oxidizing materials (Budavari, 1989; (NFPA, 1994; NIOSH , 1996).
The uninhibited vapor can form the polymer in confined areas (NFPA, 1994).
The glacial form is lighter than water; the vapors are heavier than air. Methacrylic acid, inhibited is slightly heavier than water (AAR, 1994).

FLAMMABILITY CLASSIFICATION

NFPA Flammability Rating for CAS79-41-4 (NFPA, 2002):

Listed as: Methacrylic Acid
Flammability Rating: 2

(2) Combustible. Materials that must be moderately heated before ignition can occur. Including liquids having a flash point above 100 degrees F, and solids that readily give off flammable vapors.

FIRE CONTROL/EXTINGUISHING AGENTS

SMALL FIRE PRECAUTIONS - EMERGENCY RESPONSE GUIDEBOOK, GUIDE 153 (ERG, 2004)

Dry chemical, CO2 or water spray.

LARGE FIRE PRECAUTIONS - EMERGENCY RESPONSE GUIDEBOOK, GUIDE 153 (ERG, 2004)

Dry chemical, CO2, alcohol-resistant foam or water spray.
Move containers from fire area if you can do it without risk.
Dike fire control water for later disposal; do not scatter the material.

TANK OR CAR/TRAILER LOAD FIRE PRECAUTIONS - EMERGENCY RESPONSE GUIDEBOOK, GUIDE 153 (ERG, 2004)

Fight fire from maximum distance or use unmanned hose holders or monitor nozzles.
Do not get water inside containers.
Cool containers with flooding quantities of water until well after fire is out.
Withdraw immediately in case of rising sound from venting safety devices or discoloration of tank.
ALWAYS stay away from tanks engulfed in fire.

NFPA Extinguishing Methods for CAS79-41-4 (NFPA, 2002):

Listed as: Methacrylic Acid
Extinguishing Method(s): 5

5: Flammable liquid fires can be extinguished using carbon dioxide, dry chemical, foam, and vaporizing liquid extinguishers, as long as the fires are small to moderate in size and the flammable liquid reservoir is shallow. Use of foam to form a blanket over a flammable liquid is not effective when the liquid is water-soluble. Certain alcohol resistant foams are effective extinguishing agents for polar, non-polar, and water-soluble liquid fires. These foams are preferred for fighting flammable liquid fires except those that involve water reactive flammable liquids.

To combat a fire involving methacrylic acid, use "alcohol resistant" foam, carbon dioxide, dry sand, and dry chemical. Water spray may be employed to cool exposed containers/structures. Water applied in solid streams may be ineffective. Fight fire from the greatest possible distance or from a protected location. Approach fire with extreme caution (AAR, 1994; CHRIS, 1996; (Lewis, 1996) NFPA, 1996).

COMBUSTION TOXICITY

Toxic gases may be produced in a fire involving methacrylic acid (AAR, 1994; CHRIS, 1996).

EXPLOSION HAZARD

Closed containers may explode when heated (AAR, 1994; CHRIS, 1996; (NFPA, 1994).

The vapor can explode if ignited in an enclosed area (CHRIS, 1996).

DUST/VAPOR HAZARD

Acrid fumes and carbon monoxide are emitted when methacrylic acid is heated to decomposition (Lewis, 1996; NFPA, 1994).

REACTIVITY HAZARD

CAUTION: This material may polymerize violently under high temperature conditions or upon contamination with other products. Polymerization will produce heat and high pressure buildup in containers which may lead to an explosion or container rupture (ERG, 2004).

Spontaneous exothermic polymerization may occur; this reaction is potentially explosive (Lewis, 1996; NFPA, 1994).

Specific incident reported in Urben (1995): "A more serious accident involved a railtank of acid-washed crude technical methacrylic acid (liable to throw down a dilute H2SO4 layer) which exploded, throwing debris 300 metres, some 20 hours after a pressure relief valve was seen to lift, despite being sprayed with water meanwhile. It was shipped in unlined steel without corrosion tests because that had previously been used for purified inhibited product and it contained negligible stabiliser."

Polymerization can be triggered by sunlight, elevated temperature, as well as contact with peroxides and oxidizing materials (Budavari, 1989; (NFPA, 1994; NIOSH , 1996).

Specific incident reported in Urben (1995): "A drum of the uninhibited acid...which had been stored outside under winter conditions was transferred into a warm room to liquefy the acid. Later, exothermic polymerisation led to bulging of the drum and leakage of the acid vapor."

Methacrylic acid is incompatible with strong acids (hydrochloric acid) and alkalies (NFPA, 1994; NIOSH , 1996).

The liquid is corrosive to metals (AAR, 1994; (NFPA, 1994).

EVACUATION PROCEDURES

SUMMARY

Editor's Note: This material is not listed in the Table of Initial Isolation and Protective Action Distances.

SPILL - PUBLIC SAFETY EVACUATION DISTANCES - EMERGENCY RESPONSE GUIDEBOOK, GUIDE 153 (ERG, 2004)

Increase, in the downwind direction, as necessary, the isolation distance of at least 50 meters (150 feet) for liquids and at least 25 meters (75 feet) for solids in all directions.

FIRE - PUBLIC SAFETY EVACUATION DISTANCES - EMERGENCY RESPONSE GUIDEBOOK, GUIDE 153 (ERG, 2004)

If tank, rail car or tank truck is involved in a fire, ISOLATE for 800 meters (1/2 mile) in all directions; also, consider initial evacuation for 800 meters (1/2 mile) in all directions.

PUBLIC SAFETY MEASURES - EMERGENCY RESPONSE GUIDEBOOK, GUIDE 153 (ERG, 2004)

CALL Emergency Response Telephone Number on Shipping Paper first. If Shipping Paper not available or no answer, refer to appropriate telephone number:

MEXICO:

SETIQ:

01-800-00-214-00 in the Mexican Republic;
For calls originating in Mexico City and the Metropolitan Area: 5559-1588;
For calls originating elsewhere, call: 011-52-555-559-1588.

CENACOM:

01-800-00-413-00 in the Mexican Republic;
For calls originating in Mexico City and the Metropolitan Area: 5550-1496, 5550-1552, 5550-1485, or 5550-4885;
For calls originating elsewhere, call: 011-52-555-550-1496, or 011-52-555-550-1552; 011-52-555-550-1485, or 011-52-555-550-4885.

ARGENTINA:

CIQUIME:

0-800-222-2933 in the Republic of Argentina;
For calls originating elsewhere, call: +54-11-4613-1100.

BRAZIL:

PRÓ-QUÍMICA:

0-800-118270 (Toll-free in Brazil);
For calls originating elsewhere, call: +55-11-232-1144 (Collect calls are accepted).

COLUMBIA:

CISPROQUIM:

01-800-091-6012 in Colombia;
For calls originating in Bogotá, Colombia, call: 288-6012;
For calls originating elsewhere, call: 011-57-1-288-6012.

CANADA:

CANUTEC:

613-996-6666 (Collect calls are accepted);
*666 cellular (in Canada only).

UNITED STATES:

CHEMTREC®:

1-800-424-9300 (Toll-free in the U.S., Canada, and the U.S. Virgin Islands);
703-527-3887 for calls originating elsewhere (Collect calls are accepted).

CHEM-TEL, INC.:

1-800-255-3924 (Toll-free in the U.S., Canada, and the U.S. Virgin Islands);
813-248-0585 for calls originating elsewhere (Collect calls are accepted).

INFOTRAC:

1-800-535-5053 (Toll-free in the U.S., Canada, and the U.S. Virgin Islands);
352-323-3500 for calls originating elsewhere (Collect calls are accepted).

3E COMPANY:

1-800-451-8346 (Toll-free in the U.S., Canada, and the U.S. Virgin Islands);
760-602-8703 for calls originating elsewhere (Collect calls are accepted).

NATIONAL RESPONSE CENTER (NRC):

1-800-424-8802 - (24 hours) (Toll-free in the U.S., Canada, and the U.S. Virgin Islands);
202-267-2675 for calls in the District of Columbia.

MILITARY SHIPMENTS:

703-697-0218 - Explosives/ammunition incidents (Collect calls are accepted);
1-800-851-8061 - All other dangerous goods incidents.

NATIONWIDE POISON CONTROL CENTER (United States only):

1-800-222-1222 (Toll-free in the U.S.).

For additional details see the section entitled "WHO TO CALL FOR ASSISTANCE" under the ERG Instructions.
As an immediate precautionary measure, isolate spill or leak area in all directions for at least 50 meters (150 feet) for liquids and at least 25 meters (75 feet) for solids.
Keep unauthorized personnel away.
Stay upwind.
Keep out of low areas.
Ventilate enclosed areas.

AAR (1994) states that if methacrylic acid is involved in an uncontrollable fire or if a sealed container is exposed to direct flame, consider evacuation in a one-third mile radius.

AIHA ERPG Values for CAS79-41-4 (AIHA, 2006):

Not Listed

DOE TEEL Values for CAS79-41-4 (U.S. Department of Energy, Office of Emergency Management, 2010):

Listed as Methacrylic acid
TEEL-0 (units = ppm): 6.7
TEEL-1 (units = ppm): 6.7
TEEL-2 (units = ppm): 61
TEEL-3 (units = ppm): 220
Definitions:

TEEL-0: The threshold concentration below which most people will experience no adverse health effects.
TEEL-1: The airborne concentration (expressed as ppm [parts per million] or mg/m(3) [milligrams per cubic meter]) of a substance above which it is predicted that the general population, including susceptible individuals, could experience notable discomfort, irritation, or certain asymptomatic, nonsensory effects. However, these effects are not disabling and are transient and reversible upon cessation of exposure.
TEEL-2: The airborne concentration (expressed as ppm or mg/m(3)) of a substance above which it is predicted that the general population, including susceptible individuals, could experience irreversible or other serious, long-lasting, adverse health effects or an impaired ability to escape.
TEEL-3: The airborne concentration (expressed as ppm or mg/m(3)) of a substance above which it is predicted that the general population, including susceptible individuals, could experience life-threatening adverse health effects or death.

AEGL Values for CAS79-41-4 (National Research Council, 2010; National Research Council, 2009; National Research Council, 2008; National Research Council, 2007; NRC, 2001; NRC, 2002; NRC, 2003; NRC, 2004; NRC, 2004; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2006; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2007; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2005; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2005; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2007; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2006; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2006; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2006; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2006; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2006; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2006; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2006; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2006; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2006; United States Environmental Protection Agency Office of Pollution Prevention and Toxics, 2006; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2006; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2007; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2007; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2008; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2008; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2007; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2008; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2007; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2008; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2007; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2009; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2009; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2009; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2009; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2009; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2009; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2009; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2009; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2009; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2009; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2009; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2008; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2008; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2008; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2008; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2008; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2008; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2008; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2009; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2008; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2008; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2008; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2009; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2008; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2008; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2008; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2008; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2008; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2008; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2008; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2007; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2006; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2006; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2006; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2007; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2007; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2007; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2007; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2007; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2005; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2005; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2005; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2005; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2005; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2005; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2005; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2005; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2007; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2005; National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances, 2006; 62 FR 58840, 1997; 65 FR 14186, 2000; 65 FR 39264, 2000; 65 FR 77866, 2000; 66 FR 21940, 2001; 67 FR 7164, 2002; 68 FR 42710, 2003; 69 FR 54144, 2004):

Not Listed

NIOSH IDLH Values for CAS79-41-4 (National Institute for Occupational Safety and Health, 2007):

Not Listed

CONTAINMENT/WASTE TREATMENT OPTIONS

SUMMARY

SPILL OR LEAK PRECAUTIONS - EMERGENCY RESPONSE GUIDEBOOK, GUIDE 153 (ERG, 2004)
- ELIMINATE all ignition sources (no smoking, flares, sparks or flames in immediate area).
- Do not touch damaged containers or spilled material unless wearing appropriate protective clothing.
- Stop leak if you can do it without risk.
- Prevent entry into waterways, sewers, basements or confined areas.
- Absorb or cover with dry earth, sand or other non-combustible material and transfer to containers.
- DO NOT GET WATER INSIDE CONTAINERS.
RECOMMENDED PROTECTIVE CLOTHING - EMERGENCY RESPONSE GUIDEBOOK, GUIDE 153 (ERG, 2004)
- Wear positive pressure self-contained breathing apparatus (SCBA).
- Wear chemical protective clothing that is specifically recommended by the manufacturer. It may provide little or no thermal protection.
- Structural firefighters' protective clothing provides limited protection. fire situations ONLY; it is not effective in spill situations where direct contact with the substance is possible.
Avoid contact with any form of this compound. Stay upwind. Water spray can be utilized to cool structures, protect personnel, disperse vapors, and dilute the spill to form a nonflammable mixture. Apply water from as great a distance as feasible. Keep all possible ignition sources out of the area. Runoff needs to be isolated for proper disposal; dikes can be employed to control the flow of liquid. Ensure that this material does not enter sewers and water sources (AAR, 1994; CHRIS, 1996; (NFPA, 1994).

SMALL LEAK/SPILL

To neutralize, cover with sodium bicarbonate, soda ash, crushed limestone, or lime (AAR, 1994; (ITI, 1988).

WASTE TREATMENT OPTIONS

PHYSICAL TREATMENT

Small quantities may be dissolved in a flammable solvent and then sprayed into an afterburner equipped furnace (ITI, 1988).
Waste management activities associated with material disposition are unique to individual situations. Proper waste characterization and decisions regarding waste management should be coordinated with the appropriate local, state, or federal authorities to ensure compliance with all applicable rules and regulations.

-ENVIRONMENTAL HAZARD MANAGEMENT

POLLUTION HAZARD

Methacrylic acid is likely released to the environment from stack and fugitive emissions, or in wastewater from its production and use. This compound naturally occurs in oil from Roman chamomile (Budavari, 1989; (HSDB , 1996).

ENVIRONMENTAL FATE AND KINETICS

In the atmosphere, methacrylic acid is expected to exist almost entirely as a vapor. Photo-oxidation by reaction with ozone and photochemically produced hydroxyl radicals is predicted to be a significant route; estimated atmospheric half-life of 6.12 hours. It may directly photolyze (HSDB , 1996).

WATER

SURFACE WATER
- This compound may undergo direct photolysis in sunlit waters. Volatilization is a relatively slow process; estimated half-lives of 292 days from a model pond and 27.5 days from a model river. Methacrylic acid may biodegrade. It is not expected to adsorb to suspended particulates or sediment, hydrolyze (under most conditions), or bioconcentrate in aquatic organisms (HSDB , 1996).

SOIL

TERRESTRIAL
- In soil, methacrylic acid is expected to exhibit very high mobility. It may biodegrade, leach to groundwater, and/or volatilize from surface soil, although this route may be attenuated by adsorption. Under most environmental conditions this compound is not expected to hydrolyze (HSDB , 1996).

BIODEGRADATION

Under aerobic conditions, methacrylic acid is quickly biodegraded in tests utilizing adapted activated sludge inocula (HSDB , 1996).

BIOACCUMULATION

BIOCONCENTRATION FACTOR

An estimated BCF of 3.0 indicates that this compound is not expected to significantly bioconcentrate in aquatic organisms (HSDB , 1996).

ENVIRONMENTAL TOXICITY

No information found at the time of this review.

-PHYSICAL/CHEMICAL PROPERTIES

MOLECULAR WEIGHT

86.09

DESCRIPTION/PHYSICAL STATE

Methacrylic acid exists as colorless crystals (long prisms) below 61 degrees F; above this temperature it exists as a colorless, corrosive liquid. It possesses a repulsive, acrid odor as well as a bitter taste (Budavari, 1989; (ITI, 1988; Lewis, 1996; NIOSH , 1996).

VAPOR PRESSURE

1.4 mmHg (at 30 degrees C) (Clayton & Clayton, 1994)

1 mmHg (at 25.5 degrees C) (ITI, 1988; Lewis, 1996)

1.0 mmHg (at 25 degrees C) (Clayton & Clayton, 1994)

1 mmHg (at 20 degrees C) (NFPA, 1994)

0.975 mmHg (at 25 degrees C) (HSDB , 1996)

0.7 mmHg (NIOSH , 1996)

0.65 mmHg (at 20 degrees C) (ACGIH, 1991; Clayton & Clayton, 1994)

SPECIFIC GRAVITY

OTHER TEMPERATURE AND/OR PRESSURE

1.0153 (at 20/4 degrees C) (ACGIH, 1991) Budavari, 1989)

TEMPERATURE AND/OR PRESSURE NOT LISTED

LIQUID: 1.02 (NIOSH , 1996)

DENSITY

NORMAL TEMPERATURE AND PRESSURE

(25 degrees C; 77 degrees F and 760 mmHg)
1.014 kg/L (glacial) (Lewis, 1996)

OTHER TEMPERATURE AND/OR PRESSURE

1.02 kg/L (at 20 degrees C) (Ashford, 1994; ITI, 1988)
1.015 kg/L (at 20 degrees C) (Lewis, 1993)

FREEZING/MELTING POINT

FREEZING POINT

61 degrees F (AAR, 1994; (NIOSH , 1996)
14 degrees C (Ashford, 1994)

MELTING POINT

16 degrees C; 61 degrees F; 289 degrees K (Budavari, 1989; CHRIS, 1996; (Lewis, 1996)
15-16 degrees C (Lewis, 1993)

BOILING POINT

163 degrees C; 325 degrees F (at 760 mmHg) (Budavari, 1989; (Lewis, 1996)

159-163 degrees C (Ashford, 1994)

162-163 degrees C (Clayton & Clayton, 19934)

161-162 degrees C (Lewis, 1993)

160-163 degrees C; 320-325 degrees F; 433-436 degrees K (CHRIS, 1996)

81 degrees C (at 30 mmHg) (Budavari, 1989)

63 degrees C (at 12 mmHg) (Budavari, 1989)

40% Methacrylic acid (aqueous solution): 76-78 degrees C (25 mmHg) (Lewis, 1993)

FLASH POINT

77 degrees C; 171 degrees F (Cleveland open cup) (Ashford, 1994; NFPA, 1994)

76.6 degrees C; 170 degrees F (Lewis, 1993)

76 degrees C; 170 degrees F (open cup) (ACGIH, 1991) Budavari, 1989)

170 degrees F (AAR, 1994)

154 degrees F (glacial) (AAR, 1994)

152 degrees F (closed cup) (CHRIS, 1996)

AUTOIGNITION TEMPERATURE

68 degrees C; 154 degrees F (NFPA, 1994)

EXPLOSIVE LIMITS

LOWER

1.6% (NFPA, 1994)
2.4% (calculated) (CHRIS, 1996)

UPPER

8.8% (NFPA, 1994)

SOLUBILITY

IN WATER

Methacrylic acid is slightly soluble in water; it is soluble in warm water (Ashford, 1994) Budavari, 1989; (Clayton & Clayton, 1994; Lewis, 1996). When this compound polymerizes, water soluble polymers are formed (ACGIH, 1991; ITI, 1988; Lewis, 1993).
Solubility in water at 77 degrees F: 9% (NIOSH , 1996)
Solubility in water at 25 degrees C: 89 g/L (HSDB , 1996)

IN ORGANIC SOLVENTS

It is miscible with alcohol, ether, and most organic solvents (Budavari, 1989; (Lewis, 1996). Greater than 10% soluble in alcohol and ether (HSDB , 1996). Methacrylic acid is infinitely soluble in acetone and ethanol (ACGIH, 1991; Clayton & Clayton, 1994). The polymer forms a ceramic-looking substance which is soluble in absolute alcohol, and from which it is precipitated by ether (Budavari, 1989).

OCTANOL/WATER PARTITION COEFFICIENT

Log Kow = 0.93 (HSDB , 1996)

OTHER/PHYSICAL

ODOR THRESHOLD

Data not available (CHRIS, 1996)

DISSOCIATION CONSTANT

pKa = 4.66 (HSDB , 1996)

HEAT OF POLYMERIZATION

56.5 kJ/mol (HSDB , 1996)

INDEX OF REFRACTION

1.43143 (at 20 degrees C/D) (HSDB , 1996; ITI, 1988)
1.4288 (at 25 degrees C/D) (HSDB , 1996; ITI, 1988)

-REFERENCES

GENERAL BIBLIOGRAPHY

40 CFR 372.28: Environmental Protection Agency - Toxic Chemical Release Reporting, Community Right-To-Know, Lower thresholds for chemicals of special concern. National Archives and Records Administration (NARA) and the Government Printing Office (GPO). Washington, DC. Final rules current as of Apr 3, 2006.

40 CFR 372.65: Environmental Protection Agency - Toxic Chemical Release Reporting, Community Right-To-Know, Chemicals and Chemical Categories to which this part applies. National Archives and Records Association (NARA) and the Government Printing Office (GPO), Washington, DC. Final rules current as of Apr 3, 2006.

49 CFR 172.101 - App. B: Department of Transportation - Table of Hazardous Materials, Appendix B: List of Marine Pollutants. National Archives and Records Administration (NARA) and the Government Printing Office (GPO), Washington, DC. Final rules current as of Aug 29, 2005.

49 CFR 172.101: Department of Transportation - Table of Hazardous Materials. National Archives and Records Administration (NARA) and the Government Printing Office (GPO), Washington, DC. Final rules current as of Aug 11, 2005.

62 FR 58840: Notice of the National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances - Proposed AEGL Values, Environmental Protection Agency, NAC/AEGL Committee. National Archives and Records Administration (NARA) and the Government Publishing Office (GPO), Washington, DC, 1997.

65 FR 14186: Notice of the National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances - Proposed AEGL Values, Environmental Protection Agency, NAC/AEGL Committee. National Archives and Records Administration (NARA) and the Government Publishing Office (GPO), Washington, DC, 2000.

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Information to evaluate chemical incidents

Information to evaluate chemical incidents

Information to evaluate chemical incidents