AEGL-2 is the airborne concentration (expressed as ppm or mg/m3) 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.

AEGL-3 is the airborne concentration (expressed as ppm or mg/m3) of a substance above which it is predicted that the general population, including susceptible individuals, could experience life-threatening health effects or death.

Airborne concentrations below the AEGL-1 represent exposure concentrations that could produce mild and progressively increasing but transient and nondisabling odor, taste, and sensory irritation or certain asymptomatic, nonsensory effects. With increasing airborne concentrations above each AEGL, there is a progressive increase in the likelihood of occurrence and the severity of effects described for each corresponding AEGL. Although the AEGL values represent threshold levels for the general public, including susceptible subpopulations, such as infants, children, the elderly, persons with asthma, and those with other illnesses, it is recognized that individuals, subject to idiosyncratic responses, could experience the effects described at concentrations below the corresponding AEGL.

SUMMARY

Chlorosilanes contain one or more chlorine atoms covalently bonded to a silicon atom; the maximum chlorine-to-silicon ratio is four. Chlorosilanes are chemical intermediates used in the production of silicone and silicone-containing materials, and are often produced in bulk and transported to manufacturing sites for use. Chlorosilanes are corrosive, and inhalation exposure might cause nasal, throat, or lung irritation, coughing, wheezing, and shortness of breath. Chlorosilanes react rapidly with water, steam, or moisture; hydrolysis yields hydrogen chloride (HCl) gas along with silanols and other condensation products.

The 26 chlorosilanes considered in this chapter are:

Allyl trichlorosilane

Amyl trichlorosilane

Butyl trichlorosilane

Chloromethyl trichlorosilane

Dichlorosilane

Diethyl dichlorosilane

Dimethyl chlorosilane

Dimethyl dichlorosilane

Diphenyl dichlorosilane

Dodecyl trichlorosilane

Ethyl trichlorosilane

Hexyl trichlorosilane

Methyl chlorosilane

Methyl dichlorosilane

Methyl trichlorosilane

Methylvinyl dichlorosilane

Nonyl trichlorosilane

Octadecyl trichlorosilane

Octyl trichlorosilane

Propyl trichlorosilane

Tetrachlorosilane

Trichloro(dichlorophenyl)silane

Trichlorophenylsilane

Trichlorosilane

Trimethyl chlorosilane

Vinyl trichlorosilane



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