AATCC 26-2004 Ageing of Sulfur-Dyed Textiles: Accelerated

AATCC 26-2004 Ageing of Sulfur-Dyed Textiles: Accelerated.
6. Test Specimens
6.1 Suitable test specimens are taken and blanks of the same material, dyed and undyed, used. 7. Procedure 7.1 Oven Test. Expose the specimens to 135 ± 2°C (275 ± 4°F) heat in the oven for 6 h continuously. At the beginning of the second, third, fourth, fifth and sixth hours the ports or vents are closed and 20 mL of water added for each 0.03 m 3 (1.0 ft 3 ) of oven capacity. The vents are kept closed for 5 min, then opened and circulation resumed for the rest of the pe- riod. As an alternate method the test specimens may be removed from the oven at the end of each hour and thor- oughly humidified in an atmosphere of steam, then replaced in the oven. At the end of the 6 h of heating, the specimens are removed from the oven and placed in a conditioning room, if available.
7.1.1 Alternate Oven Test. Expose the specimens to 135 ± 2°C (275 ± 4°F) heat in the oven for 6 h continuously. At the beginning of the test, 100 mL of water for each 0.03 m 3 (1.0 ft 3 ) of oven capacity is introduced into the oven in a vessel having a surface area of approximately 413 cm 2 (64 in. 2 ). The vents are left open during the entire test. At the end of the 6 h of heating, the specimens are re- moved from the oven and placed in a conditioning room, if available. Under the conditions above, it has been found that the water will require from 1.75- 2.0 h to evaporate.
7.2 The Steam Ager Test. The test specimens may be suspended while ag- ing, or may be tacked on frames, which are then placed in the steam ager, pyra- mid style, with the bottom baffle func- tioning as a support. The specimens are aged for 8 h with saturated steam at 103 kPa (15 lb) pressure, or for 16 h at 51.7 kPa (7.5 lb) pressure. After the ag- ing test is completed the specimens are removed from the ager and placed in a conditioning room, if available.
8. Evaluation of Results
8.1 Determine the breaking strength (see 10.4) of the aged specimens to eval- uate the degree of deterioration due to ageing. Test specimens and unaged blanks should be conditioned for 16 h at standard conditions, 65 ± 2% RH and 21 ± 1°C (70 ± 2°F), before making break- ing strength tests (see 10.5). A minimum of 10 significant breaks should be made and the results averaged. Results are re ported as percent loss (or gain) in strength based on the unaged material.
8.2 As an option, degree of deteriora- tion may be determined from a cupram- monium fluidity test. 9. Precision and Bias 9.1 Precision. Precision for this test method has not been established. Until a precision statement is generated for this test method, use standard statistical tech- niques in making any comparisons of test results for either within-laboratory or between-laboratory averages.
9.2 Bias. The accelerated ageing of sulfurdyed textiles can be defined only in terms of a test method. There is no independent method for determining the true value. As a means of estimating this property, the method has no known bias.AATCC 26 pdf download.