A-A-50195 Thread, AramidThis commercial item description covers nine sizes of aramid thread. The thread is intended for sewing heat and flame resistant uniforms, equipage, or supportive end items.

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A-A-50195B

3. SALIENT CHARACTERISTICS.

3.1 General description. The thread shall be made of continuous multifilament aramid yarn and shall have a soft or bonded finish as specified in the contract or purchase order (see 7.4). The finished thread in Table I shall have a minimal amount of non-flame propagating, non-staining finish commonly used to facilitate sewing. Unless otherwise specified, the direction of the twist for singles shall be "S", and the plied thread shall be "Z". Tex sizes 120 and finer shall average not more than one thread knot per 2 ounces, and Tex sizes 180 and heavier shall average not more

than one thread knot per 4 ounces.

3.2 Physical characteristics and requirements. The thread shall conform to the physical characteristics and requirements specified in Table I and breaking strength and elongation requirements specified in Table II.

TABLE I. Physical characteristics and requirements

Characteristic	Requirement	Test method
Fiber identification	Aramid	AATCC-20 or ASTM D-276
Size	See 2.1	ASTM D-3823
Twist: single plied	"S" "Z"	ASTM D-204 Procedure 22 ASTM D-204 Procedure 22
Yarn	Multifilament	Visual
Breaking strength	Table II	ASTM D-204 Procedure 19.1.1 1/ 2 /
After aging (min.)	85% of initial breaking strength	See 3.3 ASTMD-204 Procedure 19.1.1 1/ 2/
Elongation (%)	Table II	ASTM D-204 Procedure 19.4
Colorfastness (min.) Laundering (after 3 cycles)	3-4	AATCC61, 1A 3/ 4/ see 3.5

1/ Testing speed shall be 12 (+ 0.5) inch minimum, and a 10 inch gauge length unless otherwise

specified, shall be used. (see 7.4)

2/ Five determinations per sample unit.

3/ AATCC Evaluation Procedure 1, Gray Scale for Color Change.

4/ The color transfer cloth evaluation shall not apply