AATCC 42 pdf free download

AATCC 42 pdf free download.Water Resistance: Impact Penetration Test.
7. Procedure 7.1 One end of the specimen is clamped under the 152 mm spring clamp at the top of the inclined stand. Another 152土10 mm clamp, of 0.4536 kg total mass, is clamped at the free end of the test specimen. A standard blotter paper 152 X 230 mm is weighed to the nearest 0.1 g and inserted beneath the test specimen. 7.2 A 500土10 mL volume of distilled, deionized or reverse osmosis water at 27土 1°C is poured into a funnel of the tester and allowed to spray onto the test speci- men. The water should be poured into the funnel without imparting any swirling motion of the water in the funnel. (A small blade fixed to the inside of the funnel and extending down its side, will prevent any swirling motion from being initiated.)
7.3 Upon completion of the spraying period, the test specimen is carefully lifted, the blotter beneath removed, and then quickly reweighed to the nearest 0.1 g.
8. Evaluation
8.1 The increase in mass of the blotter in grams is calculated and the average resuit of the three test specimens is reported. Individual dctenninations or average values of over 5.0 g may be simply reported as + 5.0 g or> 5.0 g.
9. Report
9.1 Report the individual determinations and the average. For values of over 5.0 g simply report as ÷ 5.0 g or> 5.0 g.
9.2 Report the test method number and which piece of equipment was used.
10. Precision and Bias
10.1 Precision. In 1998, a limited intralaboratory study was completed. The same operator tested all samples.
10.1.2 Three sets of fabrics were analyzed using both pieces of equipment. Iach fabric was evaluated 15 times and averages calculated for each group of three. This single laboratory data set was analyzed and used in writing a temporary precision statement, pending a full inter- laboratory study. Until a full study is completed, users of the method arc advised to exercise conventional statistical caution in making any comparisons of test results and apply these findings with due caution. 10.1.3 Variances ranged in value from 0.1-0.4 with an average value of 0.23 (standard deviation = 0.48) for the Type I tester, as determined by analysis of vari- ance. Critical differences, based on these values and a 95% probability level, may be applied to determine significance (see Table I). 10.1.4 Variances ranged in value from 0.0-0.1 with an average value of 0.01 (standard deviation = 0.10) for the Type II tester, as determined by analysis of variance. Critical differences, based on these values and a 95% probability level, may be applied to determine significance (see Table II). 10.2 Bias. The values derived by this procedure can be defined only in terms of a test method. There is no independent, referee method for determining the true value. This test method has no known bias. 11. Notes 11.1 Impact Penetration Testers (see Figs. 1, 2, 3 and 4). These testers, Types I and II, are a combination of the spray test apparatus used in AATCC Method 22, plus the impact pene- tration head and stand. The Type II tester is a more sturdy version of the Type I tester with the addition of a drip catcher. Both these testers are available from AATCC, P.O. Box 12215, Research Triangle Park NC 27709; tel: 919/549-8141; fax: 919/549-8933; e-mail: or- ders@ aatcc .org. 11.2 Blotters suitable for this test can be obtained from AATCC， P.O. Box 12215, Research Triangle Park NC 27709; tel: 919/ 549-8141; fax: 919/549 -8933; e-mail: orders@ aatcc.org.AATCC 42  pdf download.