ACETIC ANHYDRIDE

It is used: in the manufacture of acetyl compounds as well as cellulose acetates and esters; in the manufacture of plastics, pharmaceuticals, photographic films, cigarette filters, and magnetic tape; as acetylizer and solvent in examining wool fat, glycerol, fatty and volatile oils, as well as resins; for detection of rosin; in organic syntheses (eg, as dehydrating agent in nitrations, sulfonations, and other reactions where removal of water is necessary); and, in aspirin as a esterifying agent for food starch (5% maximum). It is also used in production of drugs of abuse (Budavari, 1989; Hathaway et al, 1991; Lewis, 1992; Sax & Lewis, 1987).

FORMS

Acetic anhydride is a colorless, mobile, and very refractive liquid with a strong, acetic odor (Budavari, 1989; Lewis, 1992).

-CLINICAL EFFECTS

GENERAL CLINICAL EFFECTS

Acetic anhydride is a severe irritant of the eyes, mucous membranes, and skin.

INHALATION EXPOSURE - The immediate effect of exposure to vapor concentrations above 5 ppm is acute irritation of the eyes and upper respiratory tract. Inhalation of high vapor concentrations may produce ulceration of the nasal mucosa and, in some instances, bronchospasm.

EYE EXPOSURE - Both the liquid and the vapor can cause severe damage to the human eye. This is characterized by immediate burning, followed some hours later by an increasing severity of reaction with corneal and conjunctival edema. Interstitial corneal opacity may develop over a period of several days due to progression of tissue infiltration. In mild cases, this condition is reversible, but permanent opacification with loss of vision also may occur.

Workers exposed to acetic anhydride vapor may show evidence of conjunctivitis with associated photophobia.

DERMAL EXPOSURE - Prolonged dermal contact with the liquid may cause the skin to redden and subsequently to turn white and wrinkled, but may not be painful. Skin burns may appear later. Repeated exposure to the liquid or vapor may cause irritation. Skin sensitization in humans occasionally occurs.

ORAL EXPOSURE - Although ingestion of the liquid is unlikely in ordinary industrial use, this highly corrosive substance may be expected to produce serious burns of the mouth and esophagus.

No effects from cumulative exposure are known (ACGIH, 1991).

The following information is for ACIDS in general:

Ingestion may produce mild to moderately severe oral and esophageal burns with more severe burns occurring in the stomach. Perforations are rare but may occur. The pyloric end of the stomach is most severely affected and is the site of delayed stricture occurring generally at 3 weeks after the ingestion.
Signs and symptoms at presentation were unreliable in predicting the extent and severity of injury in a prospective study of 41 patients evaluated for location, extent, severity, and outcome of injury to the upper gastrointestinal tract following acid ingestion.

POTENTIAL HEALTH HAZARDS - EMERGENCY RESPONSE GUIDEBOOK, GUIDE 137 (ERG, 2004)

CORROSIVE and/or TOXIC; inhalation, ingestion or contact (skin, eyes) with vapors, dusts or substance may cause severe injury, burns, or death.
Fire will produce irritating, corrosive and/or toxic gases.
Reaction with water may generate much heat which will increase the concentration of fumes in the air.
Contact with molten substance may cause severe burns to skin and eyes.
Runoff from fire control or dilution water may cause pollution.

-MEDICAL TREATMENT

LIFE SUPPORT

Support respiratory and cardiovascular function.

SUMMARY

FIRST AID - EMERGENCY RESPONSE GUIDEBOOK, GUIDE 137 (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.
Removal of solidified molten material from skin requires medical assistance.
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

GENERAL -

The following information is for Acids in general.
Irrigate all contaminated areas with copious amounts of water.
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.

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).

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 -

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.
Do not induce vomiting; do not give bicarbonate to neutralize. Activated charcoal is of no value. Passing a nasogastric or orogastric tube into the stomach is controversial at this time.
STEROIDS - Steroid use is controversial. There is no good data in the literature to assess the efficacy of steroids for oral burns.
In severe cases of gastrointestinal necrosis or perforation, surgical consultation should be obtained.

-RANGE OF TOXICITY

MINIMUM LETHAL EXPOSURE

GENERAL/SUMMARY

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

ANIMAL DATA

Rats exposed to 2000 ppm for 4 hours died, but 1000 ppm for 4 hours was not lethal (Hathaway et al, 1991).

MAXIMUM TOLERATED EXPOSURE

GENERAL/SUMMARY

The maximum tolerated human exposure to this agent has not been delineated.

ANIMAL DATA

Rats exposed to 2000 ppm for 4 hours died, but 1000 ppm for 4 hours was not lethal (Hathaway et al, 1991).

Carcinogenicity Ratings for CAS108-24-7 :

ACGIH (American Conference of Governmental Industrial Hygienists, 2010): Not Listed ; Listed as: Acetic anhydride
ACGIH (American Conference of Governmental Industrial Hygienists, 2010): A4 ; Listed as: Acetic anhydride

A4 :Not Classifiable as a Human Carcinogen: Agents which cause concern that they could be carcinogenic for humans but which cannot be assessed conclusively because of a lack of data. In vitro or animal studies do not provide indications of carcinogenicity which are sufficient to classify the agent into one of the other categories.

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: Acetic anhydride
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 CAS108-24-7 (U.S. Environmental Protection Agency, 2011):

Not Listed

TOXICITY VALUES

References: RTECS, 1993
- LC50- (INHALATION)RAT:
- LD50- (SKIN)RABBIT:
- LD50- (ORAL)RAT:

-STANDARDS AND LABELS

WORKPLACE STANDARDS

ACGIH TLV Values for CAS108-24-7 (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

Acetic anhydride

TLV:

TLV-TWA: (5 ppm)
TLV-STEL: (.)
TLV-Ceiling:

Notations and Endnotes:

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

TLV Basis - Critical Effect(s): (Eye and URT irr)
Molecular Weight: 102.09

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

Additional information:

See Notice of Intended Changes; Adopted values enclosed in parentheses are those for which changes are proposed in the Notice of Intended Changes.

Notice of Intended Changes

Acetic anhydride

TLV:

TLV-TWA: 1 ppm
TLV-STEL: 3 ppm
TLV-Ceiling:

Notations and Endnotes:

Carcinogenicity Category: A4
Codes: Not Listed
Definitions:

A4: Not Classifiable as a Human Carcinogen: Agents which cause concern that they could be carcinogenic for humans but which cannot be assessed conclusively because of a lack of data. In vitro or animal studies do not provide indications of carcinogenicity which are sufficient to classify the agent into one of the other categories.

TLV Basis - Critical Effect(s): URT irr
Molecular Weight: 102.09

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 CAS108-24-7 (AIHA, 2006):

Not Listed

NIOSH REL and IDLH Values for CAS108-24-7 (National Institute for Occupational Safety and Health, 2007):

Listed as: Acetic anhydride
REL:

TWA:
STEL:
Ceiling: 5 ppm (20 mg/m(3))
Carcinogen Listing: (Not Listed) Not Listed
Skin Designation: Not Listed
Note(s):

IDLH:

IDLH: 200 ppm
Note(s): Not Listed

OSHA PEL Values for CAS108-24-7 (U.S. Occupational Safety, and Health Administration (OSHA), 2010):

Listed as: Acetic anhydride
Table Z-1 for Acetic anhydride:

8-hour TWA:

ppm: 5

Parts of vapor or gas per million parts of contaminated air by volume at 25 degrees C and 760 torr.

mg/m3: 20

Milligrams of substances per cubic meter of air. When entry is in this column only, the value is exact; when listed with a ppm entry, it is approximate.

Ceiling Value:
Skin Designation: No
Notation(s): Not Listed

OSHA List of Highly Hazardous Chemicals, Toxics, and Reactives for CAS108-24-7 (U.S. Occupational Safety and Health Administration, 2010):

Not Listed

ENVIRONMENTAL STANDARDS

EPA CERCLA, Hazardous Substances and Reportable Quantities for CAS108-24-7 (U.S. Environmental Protection Agency, 2010):

Listed as: Acetic anhydride
Final Reportable Quantity, in pounds (kilograms):

5000 (2270)

Additional Information:

EPA CERCLA, Hazardous Substances and Reportable Quantities, Radionuclides for CAS108-24-7 (U.S. Environmental Protection Agency, 2010):

Not Listed

EPA RCRA Hazardous Waste Number for CAS108-24-7 (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 CAS108-24-7 (U.S. Environmental Protection Agency, 2010):

Not Listed

EPA SARA Title III, Community Right-to-Know for CAS108-24-7 (40 CFR 372.65, 2006; 40 CFR 372.28, 2006):

Not Listed

DOT List of Marine Pollutants for CAS108-24-7 (49 CFR 172.101 - App. B, 2005):

Not Listed

EPA TSCA Inventory for CAS108-24-7 (EPA, 2005):

Listed as: Acetic acid, anhydride

SHIPPING REGULATIONS

SURFACE

DOT -- Table of Hazardous Materials and Special Provisions for UN/NA Number 1715 (49 CFR 172.101, 2005):

Hazardous materials descriptions and proper shipping name: Acetic anhydride

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

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

Identification Number: UN1715
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, 3

8: Corrosive.
3: Flammable Liquid.

Special Provisions: A3, A6, A7, A10, B2, IB2, T7, TP2

A3: For combination packagings, if glass inner packagings (including ampoules) are used, they must be packed with absorbent material in tightly closed metal receptacles before packing in outer packagings.
A6: For combination packagings, if plastic inner packagings are used, they must be packed in tightly closed metal receptacles before packing in outer packagings.
A7: Steel packagings must be corrosion-resistant or have protection against corrosion.
A10: When aluminum or aluminum alloy construction materials are used, they must be resistant to corrosion.
B2: MC 300, MC 301, MC 302, MC 303, MC 305, and MC 306 and DOT 406 cargo tanks are not authorized.
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).
TP2: a. The maximum degree of filling must not exceed the degree of filling determined by the following: [Degree of filling = 95/1+alpha(tr - tf)], where tr is the maximum mean bulk temperature during transport, tf is the temperature in degrees celsius of the liquid during filling, and alpha is the mean coefficient of cubical expansion of the liquid between the mean temperature of the liquid during filling (tf) and the maximum mean bulk temperature during transportation (tr) both in degrees celsius; and b. For liquids transported under ambient conditions a may be calculated using the formula: [alpha = (d15-d50)/(35 x d50)], where d15 and d50 are the densities (in units of mass per unit volume) of the liquid at 15 degrees C (59 degrees F) and 50 degrees C (122 degrees F), respectively.

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

Exceptions: 154
Non-bulk packaging: 202
Bulk packaging: 243

Quantity Limitations:

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

Vessel Stowage Requirements:

Vessel stowage location: A

A: The material may be stowed "on deck" or "under deck" on a cargo vessel and on a passenger vessel.

Vessel stowage other: 40

40: Stow "clear of living quarters".

ICAO International Shipping Name for UN1715 (ICAO, 2002):

Proper Shipping Name: Acetic anhydride
UN Number: 1715

LABELS

NFPA

NFPA Hazard Ratings for CAS108-24-7 (NFPA, 2002):

Listed as: Acetic Anhydride
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): 1

(1) Materials which are normally stable, but which can become unstable at elevated temperatures and pressures, or which may react with water with some release of energy, but not violently.

Oxidizer/Water-Reactive Designation: Not Listed

-HANDLING AND STORAGE

STORAGE

CONTAINER

Exclude moisture from vapor space in storage tanks (NFPA, 1991).

ROOM/CABINET RECOMMENDATIONS

Store in a cool, dry, well-ventilated location (NFPA, 1991).
Store away from heat, oxidizers, and sunlight (NFPA, 1991).
Outside or detached storage is preferred (NFPA, 1991).
Inside storage should be in a standard flammable liquids storage room or cabinet in a fire-proofed area equipped with automatic sprinkler system (OHM/TADS , 1993).
Ventilate at floor level and higher (OHM/TADS , 1993).
Avoid storage locations in pits, depressions, basements, etc (OHM/TADS , 1993).

-PERSONAL PROTECTION

SUMMARY

RECOMMENDED PROTECTIVE CLOTHING - EMERGENCY RESPONSE GUIDEBOOK, GUIDE 137 (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 in fire situations ONLY; it is not effective in spill situations where direct contact with the substance is possible.

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 108-24-7.

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

Plastic Laminate

DuPont Personal Protection

CPF 4

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): <0.001
Notes: liquid
Citation: (DuPont, 2002)

Tychem BR

Degradation Rating: No Degradation Rating provided
Breakthrough Time (minutes): >480
Permeation Rate (mcg/cm2/min): <0.001
Notes: Not Listed
Citation: (DuPont, 2002)

Tychem LV

Degradation Rating: Not Listed
Breakthrough Time (minutes): >480
Permeation Rate (mcg/cm2/min): <0.001
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): >480
Permeation Rate (mcg/cm2/min): <0.001
Notes: Not Listed
Citation: (DuPont, 2002)
Degradation Rating: No Degradation Rating provided
Breakthrough Time (minutes): >480
Permeation Rate (mcg/cm2/min): <0.001
Notes: liquid
Citation: (DuPont, 2002)

Tychem TK

Degradation Rating: No Degradation Rating provided
Breakthrough Time (minutes): >480
Permeation Rate (mcg/cm2/min): <0.001
Notes: liquid
Citation: (DuPont, 2002)
Degradation Rating: No Degradation Rating provided
Breakthrough Time (minutes): >480
Permeation Rate (mcg/cm2/min): <0.001
Notes: Not Listed
Citation: (DuPont, 2002)

Kimberly-Clark Professional

Hazard-Gard I

Degradation Rating: not tested
Breakthrough Time (minutes): Not Tested
Permeation Rate (mcg/cm2/min): Not Tested
Notes: liquid
Citation: (Kimberly-Clark, 2002)

Hazard-Gard II

Degradation Rating: PASS
Breakthrough Time (minutes): >480
Permeation Rate (mcg/cm2/min): <0.001
Notes: liquid
Citation: (Kimberly-Clark, 2002)

Trelleborg-Viking, Inc.

Degradation Rating: No Degradation Rating provided
Breakthrough Time (minutes): >480
Permeation Rate (mcg/cm2/min): <0.1
Notes: liquid
Citation: (Trelleborg-Viking, Inc., 2001)

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)

Rubber Laminate

Trelleborg-Viking, Inc.

Degradation Rating: No Degradation Rating provided
Breakthrough Time (minutes): >480
Permeation Rate (mcg/cm2/min): <0.1
Notes: liquid
Citation: (Trelleborg-Viking, Inc., 2001)

Degradation Rating: No Degradation Rating provided
Breakthrough Time (minutes): >480
Permeation Rate (mcg/cm2/min): <0.1
Notes: liquid
Citation: (Trelleborg-Viking, Inc., 2001)

Viton/Butyl

Trelleborg-Viking, Inc.

Super

Degradation Rating: No Degradation Rating provided
Breakthrough Time (minutes): >480
Permeation Rate (mcg/cm2/min): <0.1
Notes: liquid
Citation: (Trelleborg-Viking, Inc., 2001)

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: Excellent
Breakthrough Time (minutes): >480
Permeation Rate (mcg/cm2/min): None Detected
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)

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
Kimberly-Clark Professional 1400 Holcomb Bridge Road Roswell, GA 30076 Phone: (800) 255-6401 Fax: (800) 579-3555 Toll-Free: (800) 255-6401 Website: http://www.kcprofessional.com/us/ Email: kcpinfo@kcc.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
Trelleborg-Viking, Inc. 170 West Road Suite 1 Portsmouth, NH 03801 USA Phone: (603) 436-1236 Fax: (603) 436-1392 Toll-Free: (800) 344-4458 Website: http://www.trelleborg.com/protective/ Email: protective@trelleborg.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 137 (ERG, 2004)
- EXCEPT FOR ACETIC ANHYDRIDE (UN1715), THAT IS FLAMMABLE, some of these materials may burn, but none ignite readily.
- May ignite combustibles (wood, paper, oil, clothing, etc.).
- Substance will react with water (some violently), releasing corrosive and/or toxic gases.
- Flammable/toxic gases may accumulate in confined areas (basement, tanks, hopper/tank cars etc.)
- Contact with metals may evolve flammable hydrogen gas.
- Containers may explode when heated or if contaminated with water.
- Substance may be transported in a molten form.
Acetic anhydride is readily combustible. It is a moderate fire and explosion hazard when exposed to heat or flame (Budavari, 1989; Lewis, 1992).
Toxic gases and vapors such as acetic acid and carbon monoxide may be released in fire involving acetic anhydride (HSDB , 1993).

FLAMMABILITY CLASSIFICATION

NFPA Flammability Rating for CAS108-24-7 (NFPA, 2002):

Listed as: Acetic Anhydride
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

FIRE PRECAUTIONS - EMERGENCY RESPONSE GUIDEBOOK, GUIDE 137 (ERG, 2004)

When material is not involved in fire: do not use water on material itself.

SMALL FIRE PRECAUTIONS - EMERGENCY RESPONSE GUIDEBOOK, GUIDE 137 (ERG, 2004)

Dry chemical or CO2.
Move containers from fire area if you can do it without risk.

LARGE FIRE PRECAUTIONS - EMERGENCY RESPONSE GUIDEBOOK, GUIDE 137 (ERG, 2004)

Flood fire area with large quantities of water, while knocking down vapors with water fog. If insufficient water supply: knock down vapors only.

TANK OR CAR/TRAILER LOAD FIRE PRECAUTIONS - EMERGENCY RESPONSE GUIDEBOOK, GUIDE 137 (ERG, 2004)

Cool containers with flooding quantities of water until well after fire is out.
Do not get water inside containers.
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 CAS108-24-7 (NFPA, 2002):

Listed as: Acetic Anhydride
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 fight fire, use carbon dioxide, dry chemical, water mist, or alcohol foam (Lewis, 1992).

COMBUSTION TOXICITY

When heated to decomposition, acetic anhydride emits toxic fumes (Lewis, 1992).
Toxic gases and vapors such as acetic acid and carbon monoxide may be released in fire involving acetic anhydride (HSDB , 1993).
It can react vigorously with oxidizing materials (Lewis, 1992).
It will react violently on contact with water or steam (Lewis, 1992).

EXPLOSION HAZARD

Acetic anhydride forms potentially explosive reactions with the following (Lewis, 1992):

Acetic acid + water
Barium peroxide
Boric acid
Chromium trioxide
1,3-Diphenyltriazene
Hydrochloric acid + water
Hypochlorous acid
Nitric acid
Perchloric acid + water
Peroxyacetic acid
Potassium permanganate
Tetrafluoroboric acid
4-Toluenesulfonic acid + water

Acetic anhydride reacts violently with the following (Lewis, 1992):

N-tert-Butylphthalimic acid + tetrafluoroboric acid
Chromic acid
Glycerol + phosphoryl chloride
Metal nitrates (eg, copper or sodium nitrates)

Reactions with acetic anhydride and the following form explosive products (Lewis, 1992):

Ethanol + sodium hydrogen sulfate
Hydrogen peroxide

Reactions with ammonium nitrate + hexamethylenetetraminium acetate + nitric acid form as products the military explosives RDX and HMX (Lewis, 1992).

Accidental slow addition of water to a mixture of the anhydride and acetic acid led to a violent, large-scale explosion (Bretherick, 1990).

If unmoderated, the rate of acid-catalyzed hydrolysis of (water insoluble) acetic anhydride can accelerate to explosive boiling (Bretherick, 1990).

During the preparation of chromyl acetate by the direct reaction of chromic anhydride on acetic anhydride without the use of diluting solvents, a violent explosion occurred (NFPA, 1991).

Acetic anhydride or acetic acid can explode with sodium peroxide if not kept cold (NFPA, 1991).

DUST/VAPOR HAZARD

Toxic gases and vapors such as acetic acid and carbon monoxide may be released in fire involving acetic anhydride (HSDB , 1993).

Vapor is moderately irritating such that personnel will not usually tolerate moderate or high vapor concentrations (CHRIS , 1993).

REACTIVITY HAZARD

When heated to decomposition, acetic anhydride emits toxic fumes. It can react vigorously with oxidizing materials. It will react violently on contact with water or steam (Lewis, 1992).

Toxic gases and vapors such as acetic acid and carbon monoxide may be released in fire involving acetic anhydride (HSDB , 1993).

Acetic anhydride corrodes iron, steel, and other metals at normal atmosphere and temperature due to reaction with water to form acetic acid (CHRIS , 1993; OHM/TADS , 1993).

Acetic anhydride is readily combustible (Budavari, 1989).

Acetic anhydride is a moderate fire and explosion hazard when exposed to heat or flame (Lewis, 1992).

Reactions with ammonium nitrate + hexamethylenetetraminium acetate + nitric acid form as products the military explosives RDX and HMX (Lewis, 1992).

Accidental slow addition of water to a mixture of the anhydride and acetic acid led to a violent, large-scale explosion (Bretherick, 1990).

If unmoderated, the rate of acid-catalyzed hydrolysis of (water insoluble) acetic anhydride can accelerate to explosive boiling (Bretherick, 1990).

During the preparation of chromyl acetate by the direct reaction of chromic anhydride on acetic anhydride without the use of diluting solvents, a violent explosion occurred (NFPA, 1991).

Acetic anhydride or acetic acid can explode with sodium peroxide if not kept cold (NFPA, 1991).

Acetic anhydride forms potentially explosive reactions with the following (Lewis, 1992):

Acetic acid + water
Barium peroxide
Boric acid
Chromium trioxide
1,3-Diphenyltriazene
Hydrochloric acid + water
Hypochlorous acid
Nitric acid
Perchloric acid + water
Peroxyacetic acid
Potassium permanganate
Tetrafluoroboric acid
4-Toluenesulfonic acid + water

Acetic anhydride reacts violently with the following (Lewis, 1992):

N-tert-Butylphthalimic acid + tetrafluoroboric acid
Chromic acid
Glycerol + phosphoryl chloride
Metal nitrates (eg, copper or sodium nitrates)

Reactions with acetic anhydride and the following form explosive products (Lewis, 1992):

Ethanol + sodium hydrogen sulfate
Hydrogen peroxide

Acetic anhydride is incompatible with the following (Lewis, 1992):

(CrO3 + acetic acid)
HF
H2SO4
NaOH
Na2O2
N2O2
2-Aminoethanol
Aniline
Chlorosulfonic acid
Ethylenediamine
Ethyleneimine
Glycerol
(Glycerol + phosphoryl chloride)
Oleum
Permanganates
Water

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 137 (ERG, 2004)

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

FIRE - PUBLIC SAFETY EVACUATION DISTANCES - EMERGENCY RESPONSE GUIDEBOOK, GUIDE 137 (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 137 (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.

AIHA ERPG Values for CAS108-24-7 (AIHA, 2006):

Listed as Acetic Anhydride
ERPG-1 (units = ):
ERPG-2 (units = ):
ERPG-3 (units = ):
Under Ballot, Review, or Consideration: Yes
Definitions:

ERPG-1: The ERPG-1 is the maximum airborne concentration below which it is believed nearly all individuals could be exposed for up to one hour without experiencing more than mild, transient adverse health effects or perceiving a clearly defined objectionable odor.
ERPG-2: The ERPG-2 is the maximum airborne concentration below which it is believed nearly all individuals could be exposed for up to one hour without experiencing or developing irreversible or other serious health effects or symptoms that could impair an individual's ability to take protective action.
ERPG-3: The ERPG-3 is the maximum airborne concentration below which it is believed nearly all individuals could be exposed for up to one hour without experiencing or developing life-threatening health effects.

DOE TEEL Values for CAS108-24-7 (U.S. Department of Energy, Office of Emergency Management, 2010):

Listed as Acetic Anhydride
TEEL-0 (units = ppm): 0.5
TEEL-1 (units = ppm): 0.5
TEEL-2 (units = ppm): 15
TEEL-3 (units = ppm): 100
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 CAS108-24-7 (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 CAS108-24-7 (National Institute for Occupational Safety and Health, 2007):

IDLH: 200 ppm
Note(s): Not Listed

CONTAINMENT/WASTE TREATMENT OPTIONS

SUMMARY

SPILL OR LEAK PRECAUTIONS - EMERGENCY RESPONSE GUIDEBOOK, GUIDE 137 (ERG, 2004)
- Fully encapsulating, vapor protective clothing should be worn for spills and leaks with no fire.
- Do not touch damaged containers or spilled material unless wearing appropriate protective clothing.
- Stop leak if you can do it without risk.
- Use water spray to reduce vapors; do not put water directly on leak, spill area or inside container.
- Keep combustibles (wood, paper, oil, etc.) away from spilled material.
RECOMMENDED PROTECTIVE CLOTHING - EMERGENCY RESPONSE GUIDEBOOK, GUIDE 137 (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 in fire situations ONLY; it is not effective in spill situations where direct contact with the substance is possible.
At the time of this review, criteria for land treatment or burial (sanitary landfill) disposal practices are subject to significant revision. Prior to implementing land disposal of waste residue (including waste sludge), consult with environmental regulatory agencies for guidance on acceptable disposal practices (HSDB , 1993).
ENVIRONMENTAL CONSIDERATIONS - LAND SPILL (AAR, 1987)
- Dig a pit, pond, lagoon, or holding area to contain liquid or solid material.
- Dike surface flow using soil, sand bags, foamed polyurethane, or foamed concrete.
- Absorb bulk liquid with fly ash or cement powder.
- Neutralize with dilute caustic soda (NaOH) or soda ash (Na2CO3).
ENVIRONMENTAL CONSIDERATIONS - WATER SPILL (AAR, 1987)
- Add dilute caustic soda (NaOH).
ENVIRONMENTAL CONSIDERATIONS - AIR SPILL (AAR, 1987)
- Apply water spray or mist to knock down vapors.
- Vapor knockdown water is corrosive or toxic and should be diked for containment.

SMALL LEAK/SPILL

SMALL SPILL PRECAUTIONS - EMERGENCY RESPONSE GUIDEBOOK, GUIDE 137 (ERG, 2004)
- Cover with DRY earth, DRY sand or other non-combustible material followed with plastic sheet to minimize spreading or contact with rain.
- Use clean non-sparking tools to collect material and place it into loosely covered plastic containers for later disposal.
- Prevent entry into waterways, sewers, basements or confined areas.

-ENVIRONMENTAL HAZARD MANAGEMENT

POLLUTION HAZARD

AIR: Since acetic anhydride is a relatively non-volatile liquid, direct venting of the vapor to the atmosphere from a hole in a ruptured vessel does not constitute a significant hazard downwind. Only vapor released from a liquid pool spilled on a ground or water surface is important (HSDB , 1993).

WATER: When spilled on a water surface, acetic anhydride will react slowly and become miscible, and will produce an irritating vapor. Mixing takes place and the spill is diluted. In rivers, the principal mixing agent is stream turbulence, while in calm water, mixing takes place by molecular diffusion (HSDB , 1993).

WATER: Effect on water treatment processes: High concentrations may cause extremely low pH which can destroy biota and interfere with coagulation (OHM/TADS , 1993).

SOIL: When spilled onto soil, acetic anhydride will readily infiltrate downward toward groundwater (HSDB , 1993).

BIOACCUMULATION: Acetic anhydride will not bioaccumulate or contaminate the food chain (HSDB , 1993).

ENVIRONMENTAL FATE AND KINETICS

OTHER

OTHER
- No information on the environmental kinetics of acetic anhydride was found in available references at the time of this review.

ENVIRONMENTAL TOXICITY

WATER: Acetic anhydride is harmful to aquatic life in very low concentrations (CHRIS , 1993).

-PHYSICAL/CHEMICAL PROPERTIES

MOLECULAR WEIGHT

102.09 (Budavari, 1989)

DESCRIPTION/PHYSICAL STATE

Acetic anhydride is a colorless, mobile, and very refractive liquid with a strong, acetic odor (Budavari, 1989; Lewis, 1992).

pungent, vinegar-like odor (HSDB , 1993)

VAPOR PRESSURE

400 mmHg (at 119.8 degrees C) (HSDB , 1993)

100 mmHg (at 82.2 degrees C) (HSDB , 1993)

40 mmHg (at 62.1 degrees C) (HSDB , 1993)

10 mmHg (at 36.0 degrees C) (Lewis, 1992; HSDB , 1993)

4 mmHg (at 20 degrees C) (ACGIH, 1991; NFPA, 1991)

1 mmHg (at 1.7 degrees C) (HSDB , 1993)

SPECIFIC GRAVITY

OTHER TEMPERATURE AND/OR PRESSURE

1.080 (at 15/4 degrees C) (Budavari, 1989)

FREEZING/MELTING POINT

MELTING POINT

-73 degrees C (Budavari, 1989)

BOILING POINT

139 degrees C (Budavari, 1989)

FLASH POINT

121-130 degrees F (Budavari, 1989; Sax & Lewis, 1987)

AUTOIGNITION TEMPERATURE

734 degrees F (Lewis, 1992)

EXPLOSIVE LIMITS

LOWER

2.9% (Lewis, 1992)

UPPER

10.3% (Lewis, 1992)

SOLUBILITY

IN WATER

Acetic anhydride is slowly soluble in water, forming acetic acid (Budavari, 1989).
This compound is somewhat soluble in cold water, decomposes in hot water (Lewis, 1992).

IN ORGANIC SOLVENTS

It is soluble in benzene, chloroform, and ether (Budavari, 1989; HSDB , 1993).
Acetic anhydride decomposes in hot alcohol. It is miscible in alcohol and ether (Lewis, 1992).
With alcohol it forms ethyl acetate (Budavari, 1989).

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Information to evaluate chemical incidents

Information to evaluate chemical incidents