Use. 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.

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