A-A-50195B
TABLE II. Breaking strength and elongation
Tex 1/ (sizes) |
Breaking strength, lbs. (min.) |
Elongation % (max.) |
40 |
3.0 |
38 |
60 |
5.0 |
38 |
80 |
6.0 |
38 |
120 |
10.0 |
38 |
180 |
15.0 |
42 |
240 |
20.0 |
42 |
300 |
25.0 |
42 |
350 |
30.0 |
42 |
450 |
35.0 |
42 |
1/ Tex size based on weight in grams/ 1,000 meters thread.
3.3 Aging resistance test. Five specimens each, of all sizes, shall be used for the aging test. The specimens shall be exposed for 15 minutes to 500° (+10°) F using an air circulating oven. Upon removal, the specimens shall be conditioned at standard atmospheric conditions for 4 hours and then tested for breaking strength as specified in Table I.
3.4 Color. The color shall be as specified in the applicable end item specification or in the contract order. The dyed thread shall conform to the applicable approved shade standard.
3.5 Finish removal procedure. Before evaluation for shade matching and testing for colorfastness, except colorfastness to wet dry cleaning, the thread shall be wet dry cleaned in accordance with AATCC-132. Excess solvent shall be removed by centrifuging or wringing. The sample shall then be rinsed in distilled water at 120° to 160° F and dried at a temperature not exceeding 1800F. The dried sample shall then be conditioned for a minimum of 4 hours prior to evaluation for shade matching or colorfastness.
3.6 Visual shade matching. The color and appearance of the finished thread, after removal of finish (see 3.5), shall match the standard sample when viewed using AATCC Evaluation Procedure 9, Option A, with sources simulating artificial daylight D75 illuminant with a color temperature of
7500K + 200, with illumination of 100 + 20 foot candles, and shall be a good match to the standard sample under incandescent lamplight at 2856K+ 200. If no thread standard is available the sample should be a good match to the standard end item base cloth when viewed under the same lighting conditions specified above.
3.7 Finishing materials. The finished thread shall have no chemical finishes or treatments which have demonstrated harmful effects on the fiber, including effects of prolonged storage. No finish shall be used that will diminish flame resistance. No finish or treatment shall be applied for the purpose of increasing breaking strength. There shall be no noticeable wicking of the treatment on the thread to adjacent material when sewn.
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