MIL-PRF-121G
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-121; flexibility; waterproofness; contact corrosivity; greaseproofness; seam strength and
fabrication; puncture, bursting, aging, blocking, and curl resistance; delamination; 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,
MIL-STD-2073-1, Methods of Preservation 20 and 33, use MIL-PRF-121 as a primary source of
barrier materials that provide waterproof and greaseproof protection for applicable items
encountering the above conditions. MIL-PRF-121 provides one of the building blocks for applying
specialized military preservation techniques approved under MIL-STD-2073-1.
6.2 Acquisition requirements. Acquisition documents must specify the following:
a. Title, number, and date of this specification.
b. Issue of DoDISS to be cited in the solicitation, and, if required, the specific issue of
individual documents referenced.
c. Type of material (see 1.2).
d. If first article inspection is required (see 3.1).
e. Length and width of rolls required, if other than standard size (see 3.4).
f. Packaging requirements (see 5.1).
6.3 Heat-seal equipment. In the interest of standardization and for ease of manipulation, all
seals for test under this specification should be effected on a jaw-type heat-sealer. This,
however, should not be construed as an indication of Governmental preference in regard to
sealing equipment. It is not intended that the operating temperature of heat-sealing equipment be
limited to 525 °F or less. While equipment may be operated at temperatures exceeding 525 °F to
accomplish a satisfactory seal, the barrier material should also be capable of being heat-sealed at
temperatures of 525 °F or less.
6.4 First article test samples. Samples for first article inspection should consist of a sample
of the barrier material which has been produced by the contractor using the same production
process, procedures, and equipment that is going to be used in fulfilling the contract.
6.5 Conformance inspection lot. For purposes of sampling, an inspection lot for
examinations and tests should consist of all material made by the same process from the same
components by one manufacturer and submitted for delivery at one time.
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