Compaction 03 : An increase in the bulk density of powder in a dry chemical extinguisher subjected to vibration or impact (e. g. by dropping). It may adversely affect the quality of discharge of powder from the extinguisher
H. J. Porter (Chairman - Technical Committee), Dictionary of Fire Technology, The Institution of Fire Engineers, The Victory Press (Leicester) Ltd. 1979 UK. (Fr Tech - Brit) {81}