The material covered by this specification is intended for use in general packaging of military parts and equipment for storage and shipment where the use of a watervaporproof, greaseproof, heat-sealable, flexible barrier is required.

Non-flame resistant.

Class 1 material with plastic non-woven backing is intended to be used in all packaging applications where heat-sealable, flexible, watervaporproof, greaseproof, barrier materials are required.

Class 2 material with kraft backing is suitable for use for packages where the combined weight inside the barrier does not exceed 10 pounds. For all practical purposes, Class 2 material should be limited to use in bags whose inside length plus width does not exceed 42 inches. Class 2 materials should not be used in floating bag applications, in packaging operations under low temperature conditions (below 32°F) where fabrication or manipulation of the material is required, or where a double seam junction is fabricated. To prevent cracking and pin holing, packages fabricated from this material should not be handled at temperatures below 32°F.

Class 3 material is intended for use similar to Class 1 material except that a scrim (woven fabric) backing is required.

Type II material is intended for use in general packaging of military parts and equipment for storage and shipment where the use of a watervaporproof, heat-sealable, flame resistant, flexible barrier is required. Flame resistant barrier materials are intended to reduce the risks and hazards of fire aboard Navy ships and to improve fleet readiness by reducing losses due to fire destruction in compliance with the Navy Passive Fire Protection Program.