MIL-PRF-131K
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 500 °F or less. While equipment may be operated at temperatures exceeding 500 °F to
accomplish a seal, the barrier material should also be capable of being heat-sealed at
temperatures of 500 °F or less.
6.4 Qualification. With respect to products requiring qualification, awards will be made
only for products which are, at the time of award of contract, qualified for inclusion in Qualified
Products List QPL-131 whether or not such products have actually been so listed by that date.
The attention of the contractors is called to these requirements, and manufacturers are urged to
arrange to have the products that they propose to offer to the Federal Government tested for
qualification in order that they may be eligible to be awarded contracts or orders for the products
covered by this specification. Information pertaining to qualification of products and the letter of
authorization for submittal of sample may be obtained from: Commander, Naval Air Warfare
Center Aircraft Division, Building 562-3, Room 134, Code 4.3.5.3, Highway 547, Lakehurst, NJ
08733.
Barrier material supplied under contract should be identical in every respect to the samples tested
and found to meet the requirements of this specification. Any unapproved changes from the
qualification sample should constitute cause for rejection for material submitted and for removal
from the list of qualified products. However, acceptability under this specification is based on
the performance characteristics of the barrier material, and since there is no color requirement, it
is not mandatory that the color of the visible surfaces of the material supplied under contract be
the same as the samples tested and accepted by the qualifying activity.
6.5 Conformance inspection lot. For purposes of sampling, an inspection lot for
examinations and tests should consist of all material of the same class made by the same process
from the same components by one manufacturer and submitted for delivery at one time.
6.6 Material Safety Data Sheets (MSDSs). Contracting officers will identify those activities
requiring copies of completed Material Safety Data Sheets prepared in accordance with
FED-STD-313. The pertinent Government mailing addresses for submission of data are listed in
FED-STD-313; and 29 CFR 1910.1200 requires that the Material Safety Data Sheet for each
hazardous chemical used in an operation must be readily available to personnel using the
material. Contracting officers will identify the activities requiring copies of the Material Safety
Data Sheet.
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