Unstable Material 1 : Any material which will vigorously polymerize, decompose, condense, become self-reactive, or undergo other violent chemical changes
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}