Fabrics intended for this end-use should meet all the requirements listed in Table 1.
It should be recognized that fabric can be produced utilizing an almost infinite number of combinations of construction variables (e.g., type of fibers, percentage of fibers, yarn twist, yarn number, warp and pick count, chemical and mechanical finished). Additionally, fashion and aesthetics dictate that the ultimate consumer may find acceptable articles made from fabrics that do not conform to all of the requirements in Table 1.
Hence, no single performance specification can possibly apply to all the various fabrics that could be utilized for this end-use.
The uses and significance of particular properties and test methods are discussed in the appropriate sections of the specified methods.
TABLE 1 Performance Requirements
| Property | Requirements | Section |
|---|
| Grade A | Grade B | Grade C |
|---|
| Breaking strength (load) (CRT Method):
A | | | | 6.1 |
Length
Width | 244 N (55 lbf), min
244 N (55 lbf), min | 222 N (50 lbf), min
222 N (50 lbf), min | 200 N (45 lbf), min
178 N (40 lbf), min | |
| Tongue tear strength (CRT Method)
A | | | | 6.2 |
Length
Width | 27 N (6 lbf), min
22 N (5 lbf), min | 18 N (4 lbf), min
13 N (3 lbf), min | 13 N (3 lbf), min
9 N (2 lbf), min | |
| Tack-tear resistance: | | | | 6.3 |
Length
Width | 133 N (30 lbf), min
133 N (30 lbf), min | 111 N (25 lbf), min
89 N (20 lbf), min | 67 N (15 lbf), min
67 N (15 lbf), min | |
| Adhesion of coating to substrate | 525 N/m (3.0 lbf/in.),
min | 525 N/m (3.0 lbf/in.),
min | 525 N/m (3.0 lbf/in.),
min | 6.4 |
| Surface abrasion | no appreciable color change at 200 cycles, grade A, B, and C | 6.5 |
| Resistance to flexing | no cracking or delamination at 15 000 cycles, grade A, B, and C | 6.6 |
| Blocking at elevated temperature | rating 2, min, no blocking; coating adheres slightly,grade A, B, and C | 6.7 |
| Resistance to cracking at low temperature | no cracking at − 10± 1°F (−23 ± 1°C), grade A, B, and C | 6.8 |
| Colorfastness to crocking:
B | | | | 6.9.1 |
Dry
Wet | grade 4.0 min
C
grade 4.0 minC | grade 4.0 min
C
grade 4.0 minC | grade 4.0 min
C
grade 4.0 minC | |
| Colorfastness to light (xenon)
A (120 AATCC fading
units) | Step 4 min
D | Step 4 min
D | Step 4 min
D | 6.9.2 |
| Loss of plasticizer | 10 % max | 10 % max | 10 % max | 6.10 |
| Hydrolytic stability: | | | | 6.11 |
| Adhesion | must maintain 75 % of original strength, grade A, B, and C | 6.11.3.1 |
| Surface abrasion | no cracking or delamination at 25 000 cycles, grade A, B, and C | 6.11.3.2 |
| Resistance to flexing | no breaks in coating at 15 000 cycles, grade A, B, and C | 6.11.3.3 |
| Flammability | pass | pass | pass | 6.12 |
A There is more than one standard test method that can be used to measure breaking strength, tongue tear strength, and lightfastness. These test methods cannot be used interchangeably since there may be no overall correlation between them (see Note 2).
B grade in b and c is based on a numerical scale of 5 for negligible color transfer or color change to 1 for very severe color transfer or color change. The numerical rating in Table 1 or higher is acceptable.
C AATCC 8-step Chromatic Transference Scale.
D AATCC Gray Scale for Color Change.
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