A-A-52107
TABLE I. Physical requirements. (cont’d)
Characteristics |
Class 1 |
Class 2 |
Class 3 |
Test method 1/ |
Bursting strength, lbs. (min): |
- |
60 |
170 |
5120 4/ |
Dimensional stability: |
|
|
|
|
Shrinkage, percent (max), wale or course direction |
- |
5.0 5/ |
5.0 |
5580 or 5556 |
Elongation, percent (max) course direction |
- |
1.0 |
1.0 6/ |
5580 or 5556 |
1/ The test methods indicated, from FED-STD-191 Textile Test Methods, have been found acceptable to determine if the cloth meets the stated requirements. If the Government requires proof that the cloth meets the stated requirements, the test methods indicated shall be used.
2/ Refers to AATCC Chromatic Transference Scale rating.
3/ The original (total) weight of the specimen shall be determined by Method 5041 using a specimen not less than 4 square inches in area. The weighed specimen shall then be placed on a flat surface with the pile side up, and the pile shall then be sheared off with an electric clipper. Shearing shall be done in the direction of the wales and in the direction of the courses, with the base of the cutting head parallel to the plane of the specimen. Following the shearing, the specimen shall be shaken to remove the shearings and shall be weighed. This procedure shall be repeated until the sheared backing attains a constant weight with 0.05 gram tolerance. The sheared backing shall be examined for damage to the backing yarns. The weight of the shearable pile shall be determined by subtracting the weight of the sheared backing from the original weight. Reporting shall be in accordance with Method 5041.
4/ For class 3 cloth, the pile side of the cloth shall face the ball when testing for bursting strength.
5/ Determination for the class 2 cloth shall be made in accordance with Method 5580, except that the specimen shall not be steamed or pressed.
6/ Determination for the class 3 cloth shall be made in accordance with Method 5556, wool laundering procedure.
2.3 Length and put-up. Unless otherwise specified (see 5.1) the cloth shall be furnished in continuous lengths, each not less than 10 yards in the relaxed condition. The cloth shall be put-up full width on rolls as specified in 4.1.
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