M4 flame fuel thickening compound is a nonhygroscopic thickener, a di-acid aluminum soap of isooctanoic acids derived from isooctyl alcohol or isooctyl aldehyde, which are obtained from the oxidization of petroleum.Department of the Army, Military Explosives , TM 9-1300-214, September 1984 M4 is used in fire bombs and incendiary weapons. It was developed alongside napalm and M3 (octal), and was their direct successor.Data on Thickeners (U). CRL, Army Chemical Center, Maryland. 20 February 1952.
See also Napalm MK-77
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