SPECTRUM

Chemical Fact Sheet

Chemical Abstract Number (CAS #) 126998
CASRN 126-99-8
SynonymsChloroprene
2-Chloro-1,3-butadiene
1,3-Butadiene, 2-chloro-
Analytical Methods EPA Method 8010
EPA Method 8260
Molecular FormulaC4H5CL

Link to the National Library of Medicine's Hazardous Substances
Database for more details on this compound.

Use Used as a chemical intermediate in the manufacture of artificial rubber. AS COMPONENT OF ADHESIVES THAT ARE INTENDED FOR USE IN FOOD PACKAGING. MANUFACTURE OF NEOPRENE.
Consumption Patterns ESSENTIALLY 100% AS A MONOMER FOR NEOPRENE ELASTOMERS.
Apparent Color COLORLESS LIQUID
Odor VAPOR HAS PUNGENT, ETHEREAL ODOR
Boiling Point 59.4 DEG C
Melting Point -130 deg C
Molecular Weight 88.54
Density 0.9583 @ 20 DEG C/4 DEG C
Sensitivity Data BETA-CHLOROPRENE IS A LACRIMATOR. Irritating to eyes and nasal system.
Environmental Impact The main sources of environmental release of 2-chloro-1,3-butadiene are probably the effluent and emissions from plants which use this compound to make polychloroprene elastomers. If released to soil, 2-chloro-1,3-butadiene should be susceptible to removal by rapid volatilization and transport by leaching into groundwater. Chemical hydrolysis is not expected to occur. If released to water, volatilization is predicted to be the dominant removal mechanism (t1/2 3 hours from a model river 1 m deep with a current speed of 1 m/sec and wind speed of 3 m/sec). In water this compound is not expected to chemically hydrolyze, adsorb significantly to suspended solids or sediments, or bioaccumulate in aquatic organisms. If released to the atmosphere, 2-chloro-1,3-butadiene is expected to exist almost entirely in the vapor phase. The primary removal mechanism should be reaction with photochemically generated hydroxyl radicals with small amounts of 2-chloro-1,3-butadiene being removed by reaction with ozone. The overall reaction half-life has been estimated to be 1.6 hours. Anticipated reaction products include formaldehyde, 1-chloroacrolein, glyoxal, chloroglyoxal, chlorohydroxy acids and aldehydes. The most probable route of human exposure to 2-chloro-1,3-butadiene is inhalation by workers involved in the production or use of this compound.
Environmental Fate TERRESTRIAL FATE: If released to soil, 2-chloro-1,3-butadiene is expected to be susceptible to rapid volatilization and extensive leaching into groundwater. 2-chloro-1,3-butadiene will not be susceptible to chemical hydrolysis. AQUATIC FATE: If released to water, volatilization is expected to be the dominant removal mechanism. The volatilization half-life from water 1 m deep with a current speed of 1 m/sec and a wind speed of 3 m/sec has been estimated to be approximately 3 hours. 2-Chloro-1,3-butadiene is not expected to undergo chemical hydrolysis, adsorb significantly to suspended solids or sediments, or bioaccumulate in aquatic organisms. ATMOSPHERIC FATE: Based on vapor pressure of 174 mm Hg at 20 deg C , 2-chloro-1,3-butadiene is expected to exist almost entirely in the vapor phase in the atmosphere(1-2 SRC). 2-Chloro-1,3-butadiene is predicted to be removed from the atmosphere by reaction with photochemically generated hydroxyl radicals (half-life hours) and ozone (half-life 12 hours). The overall reaction half-life of the compound in the atmosphere has been estimated to be 1.6 hours. Anticipated reaction products include formaldehyde, 1-chloroacrolein, glyoxal, chloroglyoxal chlorohydroxy acids and aldehydes. Removal by wet or dry deposition is unlikely .
Drinking Water Impact SURFACE WATER: 2-Chloro-1,3-butadiene was detected in 1 out of 204 samples of surface water taken from sites near heavily industrialized areas across the US during 1975/76 . EFFL: 2-Chloro-1,3-butadiene was identified in 2 out of 63 industrial effluents at a concentration of (10 ug/L) .

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