MIL-PRF-22019E
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. 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 all of the requirements of this specification. The barrier material shall
have no adverse effect on the health of personnel (see 4.2.1 and 6.4.3).
3.3 Construction. Barrier materials shall be constructed in any manner that meets the
performance requirements of this specification.
3.3.1 Type I. Type I barrier materials shall be heat-sealable.
3.3.2 Type II. Type II barrier materials shall be coated on one side with a cohesive
substance and shall be cold sealed by pressing coated sides together.
3.4 Form. Type I barrier material shall be furnished in rolls or flat cut sheets as specified in
the contract or delivery order (see 6.2). Type II barrier material shall be furnished in rolls only.
3.4.1 Rolls. Unless otherwise specified (see 6.2), the width of roll material shall be 36
inches, with a tolerance of plus 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. Each roll shall be restrained to prevent
unwinding and shall be wrapped in at least one thickness of MIL-PRF-131, class 1 barrier
material (see 4.3.2.2 and 4.3.2.3).
3.4.2 Sheets. When flat cut sheets are specified, the length and width shall be as specified
(see 6.2). If the length and width tolerances for cut sheets are not specified, the tolerance for
each shall be plus or minus 1/8-inch (see 4.3.2.3). Flat cut sheets shall be evenly stacked
(see 4.3.2.2).
3.5 Sealing. The barrier material shall exhibit no delamination of the sealed area when
sealed according to the manufacturer's recommended conditions (see 4.5). Each roll or package
(flat cuts) of barrier material shall include a tag secured to the core of rolls, or sheet inserted in
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