Dimethyldichlorosilane
Agent Name
Dimethyldichlorosilane
CAS Number
75-78-5
Formula
C2-H6-Cl2-Si
Major Category
Toxic Gases & Vapors
Synonyms
Dichlorodimethylsilane; Dichlorodimethylsilicon; Dimethyl-dichlorsilan [Czech]; Dimethylsilane dichloride; Inerton AW-DMCS; Inerton DW-DMC; LS 130; Repel-Silan; Silane, dichlorodimethyl-; [ChemIDplus] UN1162
Category
Chlorosilanes
Description
Clear liquid with a pungent odor; [CAMEO] Colorless liquid with an acrid odor; [MSDSonline]
Sources/Uses
Used to make silicone products; Also used in the ethchlorvynol assay and as a reagent for gas chromatography; [HSDB]
Comments
Evolves HCl when spilled in water; [ERG 2016] Capable of causing second and third degree burns to eyes and skin; A severe mucous membrane and respiratory tract irritant; [HSDB] A corrosive substance that can cause pulmonary edema; [ICSC] Reacts with water; A corrosive substance that can cause injury to the skin, eyes, and respiratory tract; Inhalation may cause chemical pneumonitis; [MSDSonline] In lethal concentration studies, causes labored breathing, corneal opacities, and lung damage; [AIHA]
Biomedical References
Exposure Assessment
TIH
Yes
Dangerous When Wet
Yes
Vapor Pressure
144 mm Hg
Lethal Concentration
LC50 (rat) = 930 ppm/4h
Explanatory Notes
Flash point = -8.9 deg C; [Hawley] Not TIH in land-based spills, but TiH substance released when spilled in water; [ERG 2016] VP from ChemIDplus;
NFPA
may ignite at ambient temp
ERPG-1
2 ppm
ERPG-2
10 ppm
ERPG-3
75 ppm
WEEL
Ceiling = 2 ppm
Adverse Effects
Toxic Pneumonitis
Yes
Dermatotoxin
Skin burns
Diseases, Processes, and Activities Linked to This Agent
Diseases
Occupational diseases associated with exposure to this agent:
Processes
Industrial Processes with risk of exposure: