MIL-PRF-131K
3.4.2 Sheets. When flat cut sheets are specified, the length and width shall be as specified
by the procuring activity (see 6.2). If the length and width tolerances for cut sheets are not
specified the tolerance for each shall be plus ¼ inch or minus 1/8 inch (see 4.3.2.3). Flat cut
sheets shall be uniformly stacked (see 4.3.2.2).
3.5 Sealing. Barrier materials shall be heat-sealed under conditions recommended by the
manufacturer. These sealing conditions shall be such as are considered reasonable for production
line sealing operations with respect to commonly available sealing equipment and commercially
practical fabrication time. The material shall exhibit no delamination at the heat-sealed area
when sealed under 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
the package of sheets with the sealing instructions for heat-sealing on rotary, band, and jaw-type
sealing equipment. The tag or sheet shall be visible upon opening the unit package.
3.6 Identification of material. The specification number, class, manufacturer's name,
manufacturer's designation, month and year of manufacture, lot number, and heat sealing
conditions (temperature, pressure, and dwell time) shall be clearly and legibly marked using
water-resistant ink on the backing surface of the material. The color of the markings shall be
lusterless red (see 4.3.2.1). The complete markings shall be continuous lengthwise and the
distance between groups of markings shall be not greater than 2 inches. A complete group of
markings shall appear once in each 18 inches of width of the roll. The letters and figures shall be
not less than 1/8 inch high (see 4.3.2.3).
3.7 Performance requirements. The performance of the barrier materials shall conform to
the requirements specified in table I, when tested in accordance with 4.6.
3.8 Workmanship. Barrier material surfaces shall be free from any foreign matter. The
barrier material edges shall be cut and trimmed of any selvage. Barrier material shall be free
from holes, tears, cuts, sharp creases, wrinkles, or other imperfections (see 4.3.2.1).
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