MIL-PRF-131K
6. NOTES
(This section contains information of a general or explanatory nature that may be helpful,
but is not mandatory.)
6.1 Intended use. The barrier materials covered by this specification are intended for use in
specialized military methods of preservation. The combination of all performance characteristics of
MIL-PRF-131; seam strength and fabrication; water vapor transmission rate; breaking strength;
puncture, blocking and curl resistance; contact corrosivity; delamination; and water resistance of
markings provide the necessary requirements for protection from exposure to the extremes of the
navy/naval aviation environment. Navy/naval aviation items are exposed to high moisture, high salt
concentration, transfer at sea, rough handling, and minimal storage conditions. There are no
commercial equivalents that meet the physical, mechanical, and corrosion requirements necessary
to protect materiel that is exposed to the operational naval aviation environment. Specifically,
Methods 41, 42, 43, 51, 52, and 53 of MIL-STD-2073-1 use MIL-PRF-131 as the premier source of
barrier materials that provide watervaporproof (and watervaporproof with desiccant) protection for
applicable items encountering the above conditions.
6.1.1 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, watervaporproof, greaseproof,
barrier materials are required.
6.1.2 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.
6.1.3 Class 3 (specialized use). Class 3 is similar to Class 1 but is used for those
applications where a higher strength heat-sealable, flexible, watervaporproof, greaseproof barrier
material is required.
6.2 Acquisition requirements. Acquisition documents should specify the following:
a. Title, number, and date of the specification.
b. Class of barrier material (see 1.2).
c. Form (rolls or flat cut sheets) and size required (see 3.4).
d. Packaging requirements (see 5.1).
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