One of the more barrier materials used in Mil-Spec packaging is – MIL-PRF-131 Class 1- (or MIL-DTL-117 Type 1, Class E, Style 1 when this material is used in BAG form) . It is used when the government needs a moisture sensitive item packaged in a moisture controlled environment. This is why they call it Barrier Material. It acts as a barrier between the outside air and the part which is sealed inside the barrier bag.
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MIL= Military. Next is PRF. PRF is short for performance. What this means is that all materials used to meet this spec must have the same level of performance . They then add a numerical ‘code’ ( IE: 131- or 121- or 81705 ) to differentiate and identify the different kinds barrier materials. Each has it’s own properties. The 131 number is a water vapor proof, foil based flexible packaging material. That leaves us with the Classes. There are 3 classes. Class 1, Class 2, and Class 3) Each one has it’s own characteristics. Each of these classes calls out for a specific ( different ) laminated material. IE: Class I is always a Film (usually Nylon or PET) Foil laminate , Class II is always a Kraft ( paper) foil laminate and Class III is always a scrim ( cloth) foil laminate , These materials are printed with the pertinent MIL-SPEC numbers and can only use materials that are listed on the governments QPL . (Q)ualified (P)roducts (L)ist.
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How is this purchased? First you can buy the raw material in 36” or 48” size rolls. This way you can roll some material out, make your own bags with a heat sealer, We also make bags in house any size or quantity you need. We can make also provide tubing which is like a 100yard long open ended bag on a roll that is sealed on both sides . Just cut off the length you need and heat seal the top and bottom to make a bag. We can even make 5 sided (3-d bags) for your really tough to fit items. Just call us and we can give you all the information you need.