A-A-55278A
4/ Specimens shall be subjected to 3 complete cycles (wash and dry) prior to determination of
dynamic absorption and spray rating.
5/ One determination per sample unit and the dimensional change reported to the nearest 0.1
percent.
6/ 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. Then 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.
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".
7/ Total exposure time shall be 20 hours.
8/ Samples shall be conditioned as directed in "D1776 Practice for Conditioning Textiles for
Testing" prior to testing.
9/ Sample size shall be 22 by 22 inches with 18 inch benchmarks, 6 inches apart.
10/ Use Drying Procedure (D) or samples may be dried using a thermostatically controlled
circulating oven at 221o - 230oF until dried. The sample shall be allowed to cool for 5 minutes,
sprinkled with water to permit damp pressing, and allowed to stand in this condition for 5
minutes.
11/ The dampened specimens shall be pressed with a flatbed press as described in AATCC 96
Section 5.2 or a hand iron as described in AATCC 96 Section 5.10 at a temperature of 275o to
300o F. Section 7.4 of AATCC 96 shall not apply.
12/ Each sample shall be 7 inches by 7 inches.
13/ The specimen 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 weight of the specimen
shall be 4.0 +0.5 grams and the rotating time shall be 30 minutes with ten stainless steel balls in
each cylinder.
14/ The test for colorfastness for acid and alkaline solution shall apply.
15/ When a color change equal to Step 4 on the Gray Scale is evident in either sample being
evaluated 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
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