Explosive.

This term means a chemical compound or mixture, the primary purpose of which is to function by explosion; i.e. , with substantially instantaneous release of gas and heat. Explosives are discussed in more detail in 49 CFR parts 171-179. [CGFR 67-83, 33 FR 1113, Jan. 27, 1968, as amended by CGD 86-033, 53 FR 36026, Sept. 16, 1988]