WE CARRY MIL-PRF-131 MIL SPEC BARRIER MATERIALS
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MIL-PRF-131K Class 1 (general use). Class 1 material with plastic non-woven backing is intended tobe used in all packaging applications where heat-sealable, flexible, watervaporproof, greaseproof,barrier materials are required.
– MIL-PRF-131K Class 2 (limited use). Class 2 material with kraft backing is used for packages where the combined weight inside the barrier does not exceed 10 pounds. 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.
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MIL-PRF-131K Class 3 (specialized use). Class 3 is similar to Class 1 but is used for thoseapplications where a higher strength heat-sealable, flexible, watervaporproof, greaseproof barrier material is required.
