MIL-PRF-121G
TAPPI-T414
-
Internal Tearing Resistance of Paper (Elmendorf-type
Method).
(Application for copies of the above specifications are available from the Technical
Association of the Pulp and Paper Industry, Technology Park/Atlanta, P.O. Box 105113,
Atlanta, GA 30348.)
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 First article. When specified (see 6.2), a sample shall be subjected to first article
inspection in accordance with 4.2.
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. The barrier materials shall be constructed of one or more plies in any
manner that ensures compliance with the performance requirements of this specification.
3.3.1 Splices. A roll shall not contain more than 2 splices (3 pieces). Splices within rolls
shall be even, extend the entire width of the roll, and shall not come apart during unwinding of
the roll. Splices shall be flagged at both ends of each splice with colored markers.
3.4 Form. The barrier material shall be furnished in rolls.
3.4.1 Rolls. Unless otherwise specified (see 6.2), the width of roll material shall be 36
inches, with a tolerance of plus 1/4 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 non-returnable 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 (see 4.3.2.1).
3.5 Sealing. The material shall exhibit no delamination of the heat-sealed area when sealed
according to the manufacturer's recommended conditions (see 4.5). Each roll of barrier material
shall include a tag secured to the roll core with the sealing instructions for heat-sealing on
continuous and jaw-type sealing equipment. The tag shall be visible upon opening the unit
package (see 4.3.2.1).
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