
This round of ammunition was developed largely for testing purposes. It is identical in every way to the Cartridge, 90mm HE, M71, except for filler which consists of TNT, ammonium nitrate, and flaked aluminum. The aluminum gives a brilliant flash when the shell functions, and produces an incendiary effect against inflammable targets.
No information about hazardous components.
Nothing else to see.
TM 9-1904, Ammunition Inspection Guide (1944)