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Toxic Gases & Vapors -> Chlorosilanes

Corrosives

1.11 at 77 °F (USCG, 1999) - Denser than water; will sink

1.10 at 27 °C

Relative density (water = 1): 1.1

1.10 @ 27°C

Sol in benzene, ether, heptane

SOL IN WATER

Solubility in water: reaction

-14 °F (USCG, 1999)

-14 °F

15 °F (-9 °C) (Closed cup)

-22 °C (closed cup)

-22 °C c.c.

106.7 °F at 760 mmHg (USCG, 1999)

41 °C

41 °C

41 °C @760 [mm Hg]

Toxic hydrogen chloride and phosgene gases may be formed.

The silanes decomp at elevated temp to liberate hydrogen and deposit a high purity silicon, which leads to some of the principal uses of silanes. /Silanes/

When heated to decomposition it emits toxic fumes of /hydrogen chloride/.

The substance decomposes on contact with bases, forming flammable/explosive gas.

-135 °F (USCG, 1999)

-93 °C

-92 °C

-93 °C

3.97 (AIR= 1)

Relative vapor density (air = 1): 3.97

This chemical does not meet GHS hazard criteria for < 0.1% (1 of 2259) of reports.

Danger

H225 (> 99.9%): Highly Flammable liquid and vapor [Danger Flammable liquids]

P210, P231+P232, P233, P240, P241, P242, P243, P260, P261, P264, P270, P271, P280, P301+P316, P301+P330+P331, P302+P361+P354, P303+P361+P353, P304+P340, P305+P354+P338, P316, P321, P330, P363, P370+P378, P402+P404, P403+P233, P403+P235, P405, and P501 (click each P-code to see the statement)

Aggregated GHS information provided per 2259 reports by companies from 12 notifications to the ECHA C&L Inventory. Each notification may be associated with multiple companies.

Danger

Chemical: Silane, dichloromethyl-

Silane, dichloromethyl- is listed on the EPA's Chemical Data Reporting (CDR) system. Manufacturers and importers of Silane, dichloromethyl- are required to report information about their production and use of this chemical to the EPA under the Toxic Substances Control Act (TSCA). (40 eCFR Part 711)

Status: Active Update: 17-02-2023 https://echa.europa.eu/registration-dossier/-/registered-dossier/15125

Silane, dichloromethyl-: Does not have an individual approval but may be used as a component in a product covered by a group standard. It is not approved for use as a chemical in its own right.

The New Jersey Worker and Community Right to Know Act requires public and private employers to provide information about hazardous substances at their workplaces. (N.J.S.A. 34:5A-1 et. seq.)

Special Hazards of Combustion Products: Toxic hydrogen chloride and phosgene gases may be formed.

· Produce flammable and toxic gases on contact with water.

Highly flammable. Gives off irritating or toxic fumes (or gases) in a fire. Vapour/air mixtures are explosive.

Flammable liquid. Vapors are heavier than air and may travel to a source of ignition and flash back. Evolves hydrogen and may ignite on contact with base. Combustion by-product include hydrogen chloride, other irritants, and toxic gases. Reignition may occur.

Inhalation causes irritation of respiratory tract; heavy exposure can cause pulmonary edema. Contact of liquid with skin or eyes causes severe burns. Ingestion causes burns of mouth and stomach. (USCG, 1999)

· Highly toxic: contact with water produces toxic gas, may be fatal if inhaled.

Chlorosilanes, such as METHYLDICHLOROSILANE, are compounds in which silicon is bonded to from one to four chlorine atoms with other bonds to hydrogen and/or alkyl groups. Chlorosilanes react with water, moist air, or steam to produce heat and toxic, corrosive fumes of hydrogen chloride. They may also produce flammable gaseous H2. They can serve as chlorination agents. Chlorosilanes react vigorously with both organic and inorganic acids and with bases to generate toxic or flammable gases. Impact of dichlorosilane causes mixtures to burst into flame. This is the case, when the dichlorosilane and most likely related substances are mixed with oxidants such as potassium permanganate, lead oxide, copper oxide, or silver oxide, even under inert gas atmosphere [Bretherick, 1995, pg. 193]. With METHYLDICHLOROSILANE, toxic hydrogen chloride and phosgene gases may be formed when burned.

Excerpt from ERG Guide 139 [Substances - Water-Reactive (Emitting Flammable and Toxic Gases)]:

Use AFFF, powder, carbon dioxide. NO hydrous agents. NO water. In case of fire: keep drums, etc., cool by spraying with water. NO direct contact with water.

Fresh air, rest. Half-upright position. Artificial respiration may be needed. Refer for medical attention.

Remove contaminated clothes. Rinse skin with plenty of water or shower. Refer for medical attention .

First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then refer for medical attention.

Rinse mouth. Do NOT induce vomiting. Give nothing to drink. Refer for medical attention .

· CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper not available or no answer, refer to appropriate telephone number listed on the inside back cover.

· ELIMINATE all ignition sources (no smoking, flares, sparks or flames) from immediate area.

Get medical attention following all exposures to this compound.

General First Aid:

The vapor is heavier than air and may travel along the ground; distant ignition possible.

Difficult to extinguish; reignition may occur. Contact with water applied to adjacent fires will generate irritating hydrogen chloride.

· Wear positive pressure self-contained breathing apparatus (SCBA).

TIH (Toxic Inhalation Hazard) - Term used to describe gases and volatile liquids that are toxic when inhaled. Some are TIH materials themselves, e.g., chlorine, and some release TIH gases when spilled in water, e.g., chlorosilanes. [ERG 2016].

Fireproof /storage/. Separated from oxidants, food and feedstuffs, incompatible materials. ...Cool. Dry. Well closed. Keep under inert gas.

Store in a cool, dry, well-ventilated location. Separate from acids, alkalies, oxidizing materials, & water. Outside or detached storage is preferred.

Evacuate danger area! Consult an expert! Collect leaking liquid in sealable dry containers; do not use plastic containers. Absorb remaining liquid in sand or inert absorbent and remove to safe place. Do NOT wash away into sewer. NEVER direct water jet on liquid. (Extra personal protection: complete protective clothing including self-contained breathing apparatus.)

Eliminate all ignition sources. Stop or control the leak, if this can be done without undue risk. Use water spray to cool & disperse vapors & protect personnel. Control runoff & isolate discharged material for proper disposal.

SRP: The most favorable course of action is to use an alternative chemical product with less inherent propensity for occupational exposure or environmental contamination. Recycle any unused portion of the material for its approved use or return it to the manufacturer or supplier. Ultimate disposal of the chemical must consider: the material's impact on air quality; potential migration in soil or water; effects on animal, aquatic, and plant life; and conformance with environmental and public health regulations.

TERRESTRIAL FATE: All silicon chlorides are immediately and completely hydrolyzed by water(1); therefore, methyldichlorosilane is expected to instantaneously hydrolyze to methyl dihydroxysilane upon contact with moist soil. Absorption to moist soil surfaces is not expected to be an important environmental fate process(SRC) due to this rapid hydrolysis(1). Methyldichlorosilane is expected to volatilize from dry soil surfaces(SRC) based upon a vapor pressure of 429 mm Hg(2).

AQUATIC FATE: All silicon chlorides are immediately and completely hydrolyzed by water(1); therefore, methyldichlorosilane is expected to immediately hydrolyze to methyl dihydroxysilane upon contact with water(1). Due to the rapid hydrolysis, bioconcentration and biodegradation are not important environmental factors for methyldichlorosilane(SRC) .

AQUATIC FATE: In water, chlorosilanes are hydrolyzed rapidly, releasing hydrochloric acid. /Chlorosilane/

ATMOSPHERIC FATE: According to a model of gas/particle partitioning of semivolatile organic compounds in the atmosphere(1), methyldichlorosilane, which has a vapor pressure of 429 mm Hg at 25 °C(2), is expected to exist solely as a vapor in the ambient atmosphere. Vapor-phase methyldichlorosilane is degraded in the atmosphere by reaction with photochemically-produced hydroxyl radicals(SRC); the half-life for this reaction in air is estimated to be 107 days (SRC), calculated from its rate constant of 1.5X10-13 cu cm/molecule-sec at 25 °C(SRC) that was derived using a structure estimation method(3). Methyl silanes are transparent to UV radiation >290 nm(4) and therefore methyldichlorosilane is not expected to undergo direct photolytic degradation(SRC).

For more Environmental Fate (Complete) data for METHYLDICHLOROSILANE (6 total), please visit the HSDB record page.

Burning sensation. Cough. Sore throat. Laboured breathing. Shortness of breath. Symptoms may be delayed.

Redness. Blisters. Pain. Skin burns.

Redness. Pain. Severe deep burns.

Burning sensation. Abdominal pain. Shock or collapse.

All silicon chlorides are immediately and completely hydrolyzed by water therefore methyldichlorosilane is expected to immediately hydrolyze to methyl dihydroxysilane upon contact with water(1). Soil adsorption and mobility are negligible when compared to the immediate hydrolysis(SRC).

The Henry's Law constant for methyldichlorosilane is estimated as 1.3X10-2 atm-cu m/mole(SRC) using a fragment constant estimation method(1). Methyldichlorosilane's Henry's Law constant indicates that volatilization from moist soil surfaces may occur however hydrolysis from water(2) is expected to occur at a more rapid rate than volatilization from moist surfaces(SRC). All silicon chlorides are immediately and completely hydrolyzed by water therefore methyldichlorosilane is expected to immediately hydrolyze to methyl dihydroxysilane upon contact with water(2). Methyldichlorosilane is expected to volatilize from dry soil surfaces(SRC) based upon a vapor pressure of 429 mm Hg(3).

The high volatility of /chlorosilanes/ suggests that they will move freely into the atmosphere. /Chlorosilanes/

/LABORATORY ANIMALS: Acute Exposure/ Tests by application of a drop to rabbit eyes have been made on tetrachlorosilane, dichloridimethyl silane, dichlorodiethylsilane, methyltrichlorosilane, & ethyl trichlorosilane. All the chlorosilanes were found to cause severe damage of the cornea & lids. More severe damage was caused by the alkylchlorosilanes than by tetrachlorosilane (silicone tetrachloride). The principal danger is from splash contamination. /Chlorosilanes/

/LABORATORY ANIMALS: Acute Exposure/ Corrosive to skin /of animals/ due to liberation of hydrochloric acid.

/LABORATORY ANIMALS: Acute Exposure/ All these compounds, even in very low doses ... caused severe burns of cornea and eyelids. ... /After/ application to the skin of the rabbit the region attacked by chlorosilanes blanches and then blisters appear ... /Chlorosilanes/

The rate constant for the vapor-phase reaction of methyldichlorosilane with photochemically-produced hydroxyl radicals has been estimated as 1.5X10-13 cu cm/molecule-sec at 25 °C(SRC) using a structure estimation method(1). This corresponds to an atmospheric half-life of about 107 days at an atmospheric concentration of 5X10+5 hydroxyl radicals per cu cm(1). All silicon chlorides are immediately and completely hydrolyzed by water therefore methyldichlorosilane is expected to immediately hydrolyze to methyl dihydroxysilane upon contact with water(2). Methyl silanes are transparent to UV radiation >290 nm(3) and therefore methyldichlorosilane is not expected to undergo direct photolytic degradation(SRC).

Methyldichlorosilane

A Commercial Grade

A Placarded Amount

Chemical or material that can be mixed with readily available materials.

Used to waterproof and improve wear resistance of textiles; Also used as a monomer for silicone fluids; [HSDB]

Textiles (Printing, Dyeing, or Finishing) [Category: Industry]

Monomer for silicone fluids

Manufacture of siloxanes

The organohydrosilane of greatest commercial importance is methyldichlorosilane. Careful hydrolysis of this material with water affords polymethyhydrosiloxanes, primarily used in the textile industry to waterproof and improve the wear resistance of fabrics.

2023: 10,000,000 - <50,000,000 lb

This chemical is listed as a High Production Volume (HPV) (65FR81686). Chemicals listed as HPV were produced in or imported into the U.S. in >1 million pounds in 1990 and/or 1994. The HPV list is based on the 1990 Inventory Update Rule. (IUR) (40 CFR part 710 subpart B; 51FR21438).

(1972) Greater than 4.54x10+5 grams

(1975) Probably greater than 4.54X10+5 grams

(1986) >10 million-50 million pounds

For more U.S. Production (Complete) data for METHYLDICHLOROSILANE (8 total), please visit the HSDB record page.

All Other Basic Organic Chemical Manufacturing

Silane, dichloromethyl-: ACTIVE