Mechanical Foam 1 : A mechanical or air extinguishing foam of low expansion protein or some synthetic, the concentrates of which are available solutions of 3 percent and 6 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}