A colorless, slightly odorous liquefied petroleum gas that does not react with water, has an ignition temperature of 8600F, and an explosive range of 1. 8 percent to 8. 4 percent
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}