MIL-PRF-131K
2.4 Order of precedence. In the event of a conflict between the text of this document and
the references cited herein, the text of this document takes precedence. Nothing in this
document, however, supersedes applicable laws and regulations unless a specific exemption has
been obtained.
3. REQUIREMENTS
3.1 Qualification. The barrier materials furnished under this specification shall be products
that are authorized by the qualifying activity for listing on the applicable qualified products list
before contract award (see 4.2 and 6.4).
3.2 Material. Barrier materials shall be made from such materials and by such processes as
to ensure compliance with the performance requirements of this specification.
3.3 Construction. Barrier materials shall be constructed of one or more plies in any manner
which ensures compliance with the performance requirements of this specification. Butting of
component materials or the finished product shall not be permitted except in the direction
perpendicular to the rolling direction. When a butt weld is made on the finished product or any
ply thereof, the areas shall be externally flagged with colored markers to prevent use of that
portion of the roll.
3.3.1 Splices. A roll shall not contain more than 3 splices (4 pieces) and each piece shall be
not less than 45 yards in length. Splices within rolls shall be even the entire width of the roll
material and shall not come apart during unwinding of the roll. Rolls containing splices shall be
flagged at both ends of each splice with colored markers to indicate splices within the roll.
Barrier material in flat cut sheets shall not contain splices (see 4.3.2.2).
3.4 Form. The barrier material shall be furnished in rolls or flat cut sheets as specified in
the contract or order (see 6.2).
3.4.1 Rolls. Unless otherwise specified (see 6.2), the width of roll material shall be 36
inches, with a tolerance of plus ¼ inch or minus 1/8 inch. The average length of roll material shall
be not less than 200 yards. The length of any individual roll shall be not less than 195 yards. The
roll material shall be uniformly wound on nonreturnable cores. The core's inside diameter shall
be not less than 3 inches, with a tolerance of plus 1/8 inch. The length of the core shall be equal to
the width of the roll material, with a tolerance of plus 1/8 inch. The core shall be rigid to prevent
distortion of the roll during use and shipment conditions (see 4.3.2.3). Each roll shall be
restrained to prevent unwinding (see 4.3.2.2).
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