Butane 02 : A colorless gas (C4H10) with a flash point of -76?F, an ignition temperature of 761? F, and explosive range of 1. 9 to 8. 5 percent, used as a refrigerant and a fuel
Ralph W. Burklin & Robert G. Purington, Fire Terms: A Guide to Their Meaning and Use, National Protection Association, Boston, MA 1980 USA. (Guide: Meaning and Use, Nat Prot Association Fr Srvc - Amer) {457}