AATCC 162:2002 pdf download.Colorfastness to Water: Chlorinated Pool
8.6 Place colored test specimens in- cluding test control fabric in cylinder, close and tumble for 60 min.
8.7 Remove the test specimens and pass through wringer to remove excess solution. Rinse thoroughly with deion- ized or distilled water. Wring again and allow to dry on absorbent, bleached paper toweling at room temperature.
10.1 Interlaboratory Test Data. Inter- laboratory tests were conducted in 1982 and 1983 in which six laboratories each made five replications on six fabrics. Color change was evaluated instrumen- tally and Gray Scale ratings calculated from the instrumental readings. The com- ponents of variance expressed as the Variance Ratio (F) shows a within labora- tory ratio of 1.43, with no laboratory hav- ing a statistically significant variation be- tween tests. All tests included a standard test control fabric, and only tests in which the test control fabric rated 2-3 or 3 were considered to be valid. The average stan- dard deviation was 0.18 Gray Scale unit. Between laboratory correlation showed greater variance, with two of the five col- ors showing statistically significant dif- ference between laboratories. Therefore, before a meaningful statement can be made about two specific laboratories, the amount of statistical bias, if any, between them must be established (see 11.9).
10.2 Precision. Based on the observa- tion described in 10.1, a test is considered to be valid if test control fabric is rated at 2-3 or 3 on the AATCC Gray Scale for Color Change.
10.3 Bias. The true value of Colorfast- ness to Chlorinated Swimming Pool Wa- ter can only be defined in terms of a test method. Within this limitation, this test method has no known bias.
11.9 Another evaluation method is to deter- mine the Gray Scale grade from instrumental readings. There is a significant difference be- tween grades using the two systems, with in- strumental rating being more accurate (see AATCC Evaluation Procedure 7, Instrumental Assessment of the Change in Color of a Test Specimen). If instrumental grades are used, the procedure should be stated in the report.AATCC 162 pdf download.