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ensure accuracy. Prudent Practices in the Laboratory: Handling
and Disposal of Chemicals Flammability and Explosibility Carbon
disulfide is extremely flammable and is a dangerous fire hazard
(NFPA rating = 3). It is has a high vapor pressure and extremely
low autoignition temperature. Its vapor is heavier than air and
can travel a considerable distance to a source of ignition and
flash back. The vapor forms explosive mixtures in air at
concentrations of 1.3 to 50%. Carbon disulfide can be ignited by
hot surfaces such as steam baths that would ordinarily not
constitute an ignition source for other flammable vapors. Rust
(iron oxide) may increase the likelihood of ignition by hot
surfaces. Carbon disulfide fires should be extinguished with CO2
or dry chemical extinguishers. Reactivity and Incompatibility
Reactions of alkali metals