MIL-P-19644C, MILITARY SPECIFICATION: PLASTIC MOLDING MATERIAL (POLYSTYRENE FOAM, EXPANDED BEAD) (10-JUL-1970)

MIL-P-19644C, MILITARY SPECIFICATION: PLASTIC MOLDING MATERIAL (POLYSTYRENE FOAM, EXPANDED BEAD) (10-JUL-1970)., This specification covers shapes formed from expandable bead or pellet polystyrene and the general requirements for both the material and the shapes