A-A-55278A
Table I - Uncoated Cloth Physical Requirements (continued)
Crocking, Munsell Value
-
8.5
AATCC 16 option A
7/
No more labile
Sulfur content
8/
sulfur than shown
by the standard
sample
PH
5.0
8.5
AATCC-81
Copper content
-
0.003%
ASTM-E-1452
Manganese Content
-
0.0015%
ASTM-E-1452
1/ One determination per sample unit and the results reported as "pass" or "fail".
2/ A certificate of compliance will be acceptable for this requirement.
3/ The test specimen shall consist of a square of cloth at least 12 by 12 inches, marked off with a
square 10 by 10 inches. The test specimen shall be placed in an oven maintained at 280oF +2o
for a period of 2 hours. The specimen shall be removed from the oven and conditioned under
standard atmospheric conditions. The specimen shall then be measured for dimensional changes.
The measurements shall be made at least 1 inch from the edge of the square and at the center of
the square in the warp and filling direction. The specimen shall then be visually compared with
the original unheated fabric for distortion, or puckering. One specimen shall be tested from each
sample unit. The dimensional change of the sample unit in the warp and filling direction shall be
the average of the specimens tested from each direction, respectively, and shall be reported
separately to the nearest 0.1 percent. Distortion and puckering shall be reported as "pass" or
"fail".
NOTE: When cutting the samples, make certain the twill line goes from the lower left to the
upper right in a 45 degree angle.
4/ One determination per sample unit and the dimensional change reported to the nearest 0.1
percent.
5/ Samples shall be conditioned as directed in "D1776 Practice for Conditioning Textiles for
Testing" prior to testing.
6/ The specimens must be dried after each of the three laundering cycles. The soap solution shall
contain 0.5 percent by weight, P-D-245, Detergent, Laundry, and Hand Dishwashing (Granular)
Type II, in water hardness not over 50 parts per million. The specimen weight shall be 4.0 +0.5
grams and the rotating time shall be 30 minutes with ten stainless steel balls in each cylinder.
7/ When a color change equal to Step 4 on the Gray Scale is evident in either the evaluation
sample or the standard sample, exposure shall be continued for an additional number of hours
equal to the number of hours at which the color change was apparent. Specimens which do not
show a color change until 80 AFU's shall be returned to the machine for a total exposure period
not to exceed 140 hours.
3
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