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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.

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