A-A-50194B
3. SALIENT CHARACTERISTICS
3.1 Design and construction. The hood shall be a pull over the head style with an adjustable face opening, allowing it to be worn up over the nose, or down under the chin (see figure 1). The hood shall have two plies of the knitted cloth with a tightly woven nylon material, the weight shall be 4 ± 1 ounces when tested is accordance with ASTM D3776, Option C. The wind barrier interlining between the plies in the face area shall extend a minimum of five (5) inches past the top center of the hood and shall be anchored to prevent shifting. The interlining shall be caught in the binding all around the opening not affecting the stretch, to allow protection against wind. The interlining shall have a cut out in the mouth area.
NOTE: The figure is furnished solely for guidance and information. The face side of lining fabric shall finish toward the wearer.
3.2 Basic materials
3.2.1 Knitted cloth. The finished cloth for the hood shall be washable wool, not lower than 64's U.S Standard, which may be blended with a maximum of 15 percent synthetic fiber, and dyed Black 470. The finished cloth shall be constructed in a 1X1 rib knit and conform to the minimum requirements listed below when tested in accordance with the cited test methods.
3.2.2 Matching. The color and appearance of the dyed and finished cloth shall match the standard sample, black 470, piece number 3512.
TABLE I. Knit cloth physical requirements
Characteristics |
Requirement |
Test Method |
Fiber identification |
3.2.1 |
ASTM D3887 |
Fiber blend |
3.2.1 |
ASTM D3887 |
Knit structure |
1 x 1 rib |
Visual 1/ |
Weight, oz./sq. yd (minimum)2/ Wales and courses per inch |
8.0 5 x 12 |
ASTM D3887 ASTM D3887 |
Colorfastness to: (minimum) |
||
Crocking, wet and dry |
Grade 4 or good |
AATCC 8 |
Perspiration 4/ |
Class 4 or good |
AATCC 15 |
Laundering |
Class 4 or good |
AATCC 61, Test IA |
1/ One sample shall be used to visually determine the requirement. The results shall be reported as pass or fail.
2/ Requirement for single ply of the base knit material
3/ The wales shall be counted on one side of the fabric only.
4/ The test for colorfastness for acid and alkaline solution shall apply.
3.2.2 Thread. The thread for seaming and edge finishing shall be Black 470, C.A. 66043, polyester or cotton-covered conforming to A-A-50199, Type I or II, ticket No.'s 40, 2 or 3 ply or
50, 2 ply.
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