DICHLOROMETHYLPHENYLSILANE

Dichloromethylphenylsilane is a member of the chlorosilane family. It is a colorless liquid which is soluble in methanol, benzene, and ether (HSDB, 1993).
Little information is available on the human toxicity of dichloromethylphenylsilane. The following review is based on the properties of chlorosilanes in general. Specific effects attributed to dichloromethylphenylsilane are identified.

-CLINICAL EFFECTS

GENERAL CLINICAL EFFECTS

Little information is available on human toxicity of dichloromethylphenylsilane. This review is based on the properties of chlorosilanes in general. Effects attributed specifically to dichloromethylphenylsilane are identified.

Chlorosilanes are very corrosive to skin and mucous membranes, and liberate hydrochloric acid in the presence of water. Oral toxicity is greater than for alkyl or alkoxy non-chlorinated derivatives in animals. Little is known about effects of chronic exposure.

POTENTIAL HEALTH HAZARDS - EMERGENCY RESPONSE GUIDEBOOK, GUIDE 156 (ERG, 2004)

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

ACUTE CLINICAL EFFECTS

Chlorosilanes liberate HYDROCHLORIC ACID in the presence of water (Finkel, 1983; Sax & Lewis, 1989).

Dichloromethylphenylsilane is hazardous by the inhalation, dermal, or oral exposure routes (EPA, 1985; Sax & Lewis, 1989). The vapor is irritating to the mucous membranes, and the liquid is corrosive (CHRIS, 1993; (Finkel, 1983; EPA, 1985) HSDB, 1993; (Sax & Lewis, 1989). Chlorosilanes can cause second- or third-degree burns, and death or permanent injury may occur after brief exposure to a small quantity (EPA, 1985) CHRIS, 1993).

Severe eye irritation or burns may occur following exposure to chlorosilane vapor or liquid (CHRIS, 1993; HSDB, 1993), possibly resulting in blindness (EPA, 1985). Dyspnea (difficulty breathing) and pulmonary edema may develop after inhalation of chlorosilane vapor (EPA, 1985) CHRIS, 1993).

Ingestion of chlorosilanes may cause spontaneous vomiting, burns of the mouth, esophagus, and stomach, viscid white or blood-stained foamy mucous, threads of tissue in the mouth, swelling of the throat, and possibly perforation of the esophagus, together with systemic effects such as weak and rapid pulse and circulatory collapse (EPA, 1985) HSDB, 1993). Emesis may contain fresh blood if corrosion of the gastrointestinal tract has occurred (HSDB, 1993). Systemic effects such as circulatory collapse leading to kidney failure, and weak and rapid pulse, may follow ingestion (HSDB, 1993). Gastric and pyloric strictures, stenosis, and obstruction by scar tissue may require surgical repair (EPA, 1985).

Shallow and difficult breathing, lacrimation, nasal discharge, salivation, and kidney failure were noted in rats exposed to chlorosilane vapor (Rowe et al, 1948). The instillation of a small drop of any of the chlorosilanes produced severe damage in rabbit eyes, including corneal and eyelid burns (Rowe et al, 1948). Corrosion of the gastrointestinal tract occurred when chlorosilanes were given orally (Rowe et al, 1948).

In experimental animals, oral toxicity is greater for the chlorosilanes than for the alkyl or alkoxy non-chlorinated derivatives (RTECS , 1993).

CHRONIC CLINICAL EFFECTS

At the time of this review, no reports of chronic exposure to dichloromethylphenylsilane were found in humans or experimental animals.

-MEDICAL TREATMENT

LIFE SUPPORT

Support respiratory and cardiovascular function.

SUMMARY

FIRST AID - EMERGENCY RESPONSE GUIDEBOOK, GUIDE 156 (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

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.
ACUTE LUNG INJURY: Maintain ventilation and oxygenation and evaluate with frequent arterial blood gases and/or pulse oximetry monitoring. Early use of PEEP and mechanical ventilation may be needed.
All persons with significant inhalation exposure should be admitted to a hospital, and observed and treated under controlled conditions until all signs and symptoms have resolved.

DERMAL EXPOSURE -

DECONTAMINATION: Remove contaminated clothing and jewelry and irrigate exposed areas with copious amounts of water. A physician may need to examine the area if irritation or pain persists.
Remove and isolate all contaminated clothing and shoes (EPA, 1985). Treat as hazardous waste.
All persons with significant dermal exposure should be admitted to a hospital, and observed and treated under controlled conditions until all signs and symptoms have resolved.
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.
There is no specific antidote for eye exposure to the chlorosilanes (Grant, 1986). All persons with significant eye exposure should be admitted to a hospital, and observed and treated under controlled conditions until all signs and symptoms have resolved.

ORAL EXPOSURE -

Do not induce vomiting or give bicarbonate to neutralize.
Irrigate the mouth with copious amounts of water.
Immediately dilute with 4 to 8 ounces (120 to 240 milliliters) of milk or water (not to exceed 15 milliliters per kilogram in a child).
Follow dilution with appropriate demulcents - milk, cornstarch, and water.
All persons with significant oral exposure should be admitted to a hospital and observed and treated under controlled conditions until all signs and symptoms have resolved.

-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.

Carcinogenicity Ratings for CAS149-74-6 :

ACGIH (American Conference of Governmental Industrial Hygienists, 2010): Not Listed
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
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 CAS149-74-6 (U.S. Environmental Protection Agency, 2011):

Not Listed

TOXICITY VALUES

References: RTECS, 1997
- LCLo- (INHALATION)MOUSE:
- LDLo- (INTRAPERITONEAL)MOUSE:
- LDLo- (SUBCUTANEOUS)MOUSE:
- LDLo- (INTRAPERITONEAL)RAT:

-STANDARDS AND LABELS

WORKPLACE STANDARDS

ACGIH TLV Values for CAS149-74-6 (American Conference of Governmental Industrial Hygienists, 2010):

Not Listed

AIHA WEEL Values for CAS149-74-6 (AIHA, 2006):

Not Listed

NIOSH REL and IDLH Values for CAS149-74-6 (National Institute for Occupational Safety and Health, 2007):

Not Listed

OSHA PEL Values for CAS149-74-6 (U.S. Occupational Safety, and Health Administration (OSHA), 2010):

Not Listed

OSHA List of Highly Hazardous Chemicals, Toxics, and Reactives for CAS149-74-6 (U.S. Occupational Safety and Health Administration, 2010):

Not Listed

ENVIRONMENTAL STANDARDS

EPA CERCLA, Hazardous Substances and Reportable Quantities for CAS149-74-6 (U.S. Environmental Protection Agency, 2010):

Not Listed

EPA CERCLA, Hazardous Substances and Reportable Quantities, Radionuclides for CAS149-74-6 (U.S. Environmental Protection Agency, 2010):

Not Listed

EPA RCRA Hazardous Waste Number for CAS149-74-6 (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 CAS149-74-6 (U.S. Environmental Protection Agency, 2010):

Listed as: Dichloromethylphenylsilane
Reportable Quantity, in pounds: 1000

Only the statutory or final RQ is shown. For more information, see 40 CFR table 302.4.

Threshold Planning Quantity, in pounds:

1000
Amount necessary to be covered by this standard. See 40 CFR 355.30.

Note(s): Not Listed

EPA SARA Title III, Community Right-to-Know for CAS149-74-6 (40 CFR 372.65, 2006; 40 CFR 372.28, 2006):

Not Listed

DOT List of Marine Pollutants for CAS149-74-6 (49 CFR 172.101 - App. B, 2005):

Not Listed

EPA TSCA Inventory for CAS149-74-6 (EPA, 2005):

Listed as: Silane, dichloromethylphenyl-

SHIPPING REGULATIONS

SURFACE

DOT -- Table of Hazardous Materials and Special Provisions for UN/NA Number 2437 (49 CFR 172.101, 2005):

Hazardous materials descriptions and proper shipping name: Methylphenyldichlorosilane

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

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

Identification Number: UN2437
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: TP2, TP13, IB2, T7

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.
TP13: Self-contained breathing apparatus must be provided when this hazardous material is transported by sea.
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).

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 UN2437 (ICAO, 2002):

Proper Shipping Name: Methylphenyldichlorosilane
UN Number: 2437

LABELS

NFPA

NFPA Hazard Ratings for CAS149-74-6 (NFPA, 2002):

Not Listed

-PERSONAL PROTECTION

SUMMARY

RECOMMENDED PROTECTIVE CLOTHING - EMERGENCY RESPONSE GUIDEBOOK, GUIDE 156 (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.

Use of full protective clothing is recommended for fire fighting activities and safe handling and use of dichloromethylphenylsilane (EPA, 1985).

RESPIRATORY PROTECTION

Use of self-contained positive pressure breathing apparatus is recommended for fire fighting activities and safe handling and use of dichloromethylphenylsilane (EPA, 1985).

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 149-74-6.

Specific recommendations and test data for this chemical were not found in the available manufacturers' product literature. A complete list of consulted manufacturers and references is presented below.

-PHYSICAL HAZARDS

FIRE HAZARD

SUMMARY

POTENTIAL FIRE OR EXPLOSION HAZARDS - EMERGENCY RESPONSE GUIDEBOOK, GUIDE 156 (ERG, 2004)
- Combustible material: may burn but does not ignite readily.
- Substance will react with water (some violently) releasing flammable, toxic or corrosive gases and runoff.
- When heated, vapors may form explosive mixtures with air: indoors, outdoors and sewers explosion hazards.
- Most vapors are heavier than air. They will spread along ground and collect in low or confined areas (sewers, basements, tanks).
- Vapors may travel to source of ignition and flash back.
- Contact with metals may evolve flammable hydrogen gas.
- Containers may explode when heated or if contaminated with water.
Dichloromethylphenylsilane is a flammable/combustible material (Sax & Lewis, 1989).
When heated to decomposition, dichloromethylphenylsilane emits toxic fumes of chloride (Sax & Lewis, 1989).
- Chlorinated silanes are corrosive to eyes, skin, and mucous membranes, and liberate hydrochloric acid in the presence of water.
Wear full protective clothing and a self-contained positive pressure breathing apparatus (EPA, 1985).

FLAMMABILITY CLASSIFICATION

NFPA Flammability Rating for CAS149-74-6 (NFPA, 2002):

Not Listed

FIRE CONTROL/EXTINGUISHING AGENTS

FIRE PRECAUTIONS - EMERGENCY RESPONSE GUIDEBOOK, GUIDE 156 (ERG, 2004)

Note: Most foams will react with the material and release corrosive/toxic gases.

SMALL FIRE PRECAUTIONS - EMERGENCY RESPONSE GUIDEBOOK, GUIDE 156 (ERG, 2004)

CO2, dry chemical, dry sand, alcohol-resistant foam.

LARGE FIRE PRECAUTIONS - EMERGENCY RESPONSE GUIDEBOOK, GUIDE 156 (ERG, 2004)

Water spray, fog or alcohol-resistant foam.
FOR CHLOROSILANES, DO NOT USE WATER; use AFFF alcohol-resistant medium expansion foam.
Move containers from fire area if you can do it without risk.
Use water spray or for; do not use straight streams.

TANK OR CAR/TRAILER LOAD FIRE PRECAUTIONS - EMERGENCY RESPONSE GUIDEBOOK, GUIDE 156 (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 CAS149-74-6 (NFPA, 2002):

Not Listed

Apply water from as far a distance as possible.

COMBUSTION TOXICITY

When heated to decomposition, dichloromethylphenylsilane emits toxic fumes of chloride (Sax & Lewis, 1989).
Chlorinated silanes liberate hydrochloric acid in the presence of water.

DUST/VAPOR HAZARD

When heated to decomposition, dichloromethylphenylsilane emits toxic fumes of chloride (Sax & Lewis, 1989).

Chlorinated silanes liberate hydrochloric acid in the presence of water.

REACTIVITY HAZARD

When heated to decomposition, dichloromethylphenylsilane emits toxic fumes of chloride (Lewis, 1996).

Dichloromethylphenylsilane reacts strongly with oxidizing materials (EPA, 1985).

Chlorinated silanes liberate hydrochloric acid in the presence of water.

EVACUATION PROCEDURES

SUMMARY

Initial Isolation and Protective Action Distances (ERG, 2004)

Data presented from the Emergency Response Guidebook Table of Initial Isolation and Protective Action Distances are for use when a spill has occurred and there is no fire. If there is a fire, or if a fire is involved, evacuation information presented under FIRE - PUBLIC SAFETY EVACUATION DISTANCES should be used.
Generally, a small spill is one that involves a single, small package such as a drum containing up to approximately 200 liters, a small cylinder, or a small leak from a large package. A large spill is one that involves a spill from a large package, or multiple spills from many small packages.
Suggested distances to protect from vapors of toxic-by-inhalation and/or water-reactive materials during the first 30 minutes following the spill.

DOT ID No. 2437 - Methylphenyldichlorosilane

when spilled in water
SMALL SPILLS

First isolate in all directions: 30 meters (100 feet).
Note wind direction.
Then protect persons downwind:

during the DAY for: 0.1 kilometers (0.1 miles); or
during the NIGHT for: 0.1 kilometers (0.1 miles).

LARGE SPILLS

First isolate in all directions: 30 meters (100 feet).
Note wind direction.
Then protect persons downwind:

during the DAY for: 0.3 kilometers (0.2 miles); or
during the NIGHT for: 1.1 kilometers (0.7 miles).

CAUTION:

This material which produces large amounts of the following gas(es)when spilled in water:

Hydrogen chloride

SPILL - PUBLIC SAFETY EVACUATION DISTANCES - EMERGENCY RESPONSE GUIDEBOOK, GUIDE 156 (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 156 (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 156 (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 CAS149-74-6 (AIHA, 2006):

Not Listed

DOE TEEL Values for CAS149-74-6 (U.S. Department of Energy, Office of Emergency Management, 2010):

Listed as Dichloromethylphenylsilane
TEEL-0 (units = mg/m3): 1
TEEL-1 (units = mg/m3): 3
TEEL-2 (units = mg/m3): 20
TEEL-3 (units = mg/m3): 20
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 CAS149-74-6 (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 CAS149-74-6 (National Institute for Occupational Safety and Health, 2007):

Not Listed

CONTAINMENT/WASTE TREATMENT OPTIONS

SUMMARY

SPILL OR LEAK PRECAUTIONS - EMERGENCY RESPONSE GUIDEBOOK, GUIDE 156 (ERG, 2004)
- ELIMINATE all ignition sources (no smoking, flares, sparks or flames in immediate area).
- All equipment used when handling the product must be grounded.
- Do not touch damaged containers or spilled material unless wearing appropriate protective clothing.
- Stop leak if you can do it without risk.
- A vapor suppressing foam may be used to reduce vapors.
- FOR CHLOROSILANES, use AFFF alcohol-resistant medium expansion foam to reduce vapors.
- DO NOT GET WATER on spilled substance or inside containers.
- Use water spray to reduce vapors or divert vapor cloud drift. Avoid allowing water runoff to contact spilled material.
- Prevent entry into waterways, sewers, basements or confined areas.
RECOMMENDED PROTECTIVE CLOTHING - EMERGENCY RESPONSE GUIDEBOOK, GUIDE 156 (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.
Wear full protective clothing and self-contained positive pressure breathing apparatus (EPA, 1985).

SMALL LEAK/SPILL

SMALL SPILL PRECAUTIONS - EMERGENCY RESPONSE GUIDEBOOK, GUIDE 156 (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.

-ENVIRONMENTAL HAZARD MANAGEMENT

POLLUTION HAZARD

No information found at the time of this review.

ENVIRONMENTAL FATE AND KINETICS

OTHER

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

ENVIRONMENTAL TOXICITY

No information on the environmental toxicity of dichloromethylphenylsilane was found in available references at the time of this review.

-PHYSICAL/CHEMICAL PROPERTIES

MOLECULAR WEIGHT

191.14 (Lewis, 1996)

DESCRIPTION/PHYSICAL STATE

Dichloromethylphenylsilane is a colorless liquid (EPA, 1985).

ODOR and TASTE

No information found at the time of this review.

No information found at the time of this review.

It would be expected to be acidic, due to the liberation of hydrochloric acid.

DENSITY

TEMPERATURE AND/OR PRESSURE NOT LISTED

1.19 g/L (HSDB , 1990)

BOILING POINT

82 degrees C (at 13 mm Hg) (HSDB , 1990)

205 degrees C; 401 degrees F (EPA, 1985)

FLASH POINT

28 degrees C (EPA, 1985)

83 degrees F (EPA, 1985; HSDB , 1990)

OTHER/PHYSICAL

INDEX OF REFRACTION

1.5199 (at 25 degrees C/D) (HSDB , 1990)

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Information to evaluate chemical incidents

Information to evaluate chemical incidents

Information to evaluate chemical incidents