Agent Name

Chlorotrimethylsilane

Alternative Name

Trimethylchlorosilane

CAS Number

75-77-4

Formula

C3-H9-Cl-Si

Major Category

Toxic Gases & Vapors

Synonyms

Monochlorotrimethylsilicon; Silane, chlorotrimethyl-; Silane, trimethylchloro-; Silicane, chlorotrimethyl-; Silylium, trimethyl-, chloride; TL 1163; Trimethyl chlorosilane; Trimethylchlorosilane; Trimethylsilyl chloride; [ChemIDplus] UN1298

Category

Chlorosilanes

Description

Colorless liquid with a pungent odor; [ICSC]

Sources/Uses

Used in the production of silicone fluids and water-repellent compounds; [HSDB] Manufactured, stored, and used in specialized facilities with airtight systems with an inert atmosphere and collection and process systems for ventilation gases; [IUCLID]

Comments

Corrosive to skin; [Quick CPC] A lachrymator; [HSDB] Corrosive to skin, eye, and respiratory tract; High inhalation exposure can cause pulmonary edema; [ICSC] Toxicity due to release of HCl during hydrolysis; [AIHA] Reacts violently and exothermically with water evolving hydrogen chloride gas (heat of reaction may ignite combustible materials); [CAMEO]

Exposure Assessment
TIH

Yes

Dangerous When Wet

Yes - A material that, by contact with water, is liable to become spontaneously flammable or to give off flammable or toxic gas at a rate greater than 1 L per kilogram of the material, per hour; [ERG 2004]

WEEL

Ceiling = 5 ppm

Vapor Pressure

234 mm Hg

Lethal Concentration

LC50 (rat) = 13,175 mg/m3/1hr

Explanatory Notes

Not TIH in land-based spills, but TiH substance released when spilled in water; [ERG 2016] Flash point = -28 deg C;

Adverse Effects
Lacrimator

Yes

Toxic Pneumonitis

Yes

Dermatotoxin

Skin Burns

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Diseases

Occupational diseases associated with exposure to this agent:

Processes

Industrial Processes with risk of exposure: