MIL-C-83409, MILITARY SPECIFICATION: COATINGS, VISOR, POLYCARBONATE, FLYING HELMET (9 FEB 1973)

MIL-C-83409, MILITARY SPECIFICATION: COATINGS, VISOR, POLYCARBONATE, FLYING HELMET (9 FEB 1973)., This specification covers the optical and durability requirements for abrasion resisting coatings as applied polycarbonate visors conforming to MIL-V-43511.