MIL-P-4640A, MILITARY SPECIFICATION: PLASTIC FILM, POLYETHYLENE, FOR BALLOON USE (17-JUN-1957) [NO S/S DOCUMENT]
MIL-P-4640A, MILITARY SPECIFICATION: PLASTIC FILM, POLYETHYLENE, FOR BALLOON USE (17-JUN-1957) [NO S/S DOCUMENT]., This specification covers polyethylene plastic film furnished as flat tubing, and suitable for balloon use.