MIL-PRF-131K Barrier Materials Water Vaporproof

MIL-PRF-131K is water-vapor proof barrier material the government uses when it needs protection from moisture. MIL-PRF-131K comes in 3 classes all used for different levels of protection. All MIL PRF 131K can be made into any size bag and ship from our location.

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MIL-PRF-131K Classes

 MIL-PRF-131K is a set of specifications established by the U.S. Department of Defense that impacts the types of packaging materials used in military applications. This specification covers the requirements for heat-sealable, greaseproof, flexible barrier materials having low water vapor transmission characteristics for use in military packaging.

MIL-PRF-131K Class 1 (general use). Class 1 material with plastic non-woven backing is intended to be used in all packaging applications where heat-sealable, flexible, water vaporproof, 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.

MIL-PRF-131K Class 3 (specialized use). Class 3 is similar to Class 1 but is used for those
applications where a higher strength heat-sealable, flexible, water vaporproof, greaseproof barrier material is required.


MIL-SPEC Contracts

We have earned our enviable industry reputation in part because of our four decades of experience and knowledge of the U.S. Department of Defense’s detailed military packaging specifications and regulations.

MIL-SPEC Labeling

We are experts in the complex military packaging and labeling requirements. We make sure your package gets delivered to it’s desired location on-time at a lower cost than you can do yourself.

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