MIL-DTL-3738L
TABLE II. End item tests - continued
Characteristics
Requirement paragraph
Test method
Weight
3.5
ASTM D3776
Yarns per inch
3.5
ASTM D3775
Breaking strength
3.5
ASTM D5034
Dimensional stability
3.5
AATCC 99
Weave
3.6
Visual 1/
AATCC 81
pH
3.7.1
AATCC 20A
Wool content
3.9
1/
Only one sample unit shall be subjected to this test regardless of lot size. Prior to wool
grade determination, two 3 inch (filling direction) wide swatches shall be cut from the
sample unit. Each swatch shall be sufficiently long to weight 5.0 + 0.5 grams. The
swatches shall be taken from areas at least 2 inches from the selvages and shall not
contain the same warp or filling yarns. Both swatches shall then be stripped of dye
as specified in 4.4.1. One 2 by 2 inch specimen shall then be cut from each of the
stripped swatches and tested for wool grade in accordance with ASTM D2130. If
any specimen fails to meet the specified grade, the lot shall be rejected.
2/
One determination per sample unit and the results reported as "pass" or "fail".
3/
As specified in MIL-C-43665
4.4
Methods of inspection.
4.4.1 Stripping procedure. The swatches shall be stripped of dye in a launderometer
or similar machine in accordance with AATCC 61, Test 1A. Place 1 gram of zinc or sodium
sulfoxylated formadelhyde in each of the two machine canisters. Add 400 ml of distilled water
shall be added to each, and adjust pH to 3.0 to 3.5 with acetic acid. Place a 5-gram swatch shall
in each canister, seal, and rotate in the machine until the temperature reaches 208o F. Then,
while maintaining the temperature at 208 + 3oF, continue the rotation for an additional 30
minutes. Remove the swatches and rinse them with warm (120o F) water for 5 minutes, then
with cold water for 5 minutes. Air dry on a flat surface under ambient conditions.
8
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