AATCC 106-2002 Colorfastness to Water: Sea.
11. Precision and Bias
11.1 Precision. A study, initiated in 1997, is underway to establish precision for this method. Until a precision state- ment is generated for this method, use standard statistical techniques in making any comparisons of test results for either within-laboratory or between-laboratory averages.
11.2 Bias. Colorfastness to sea water 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.
12. Notes
12.1 For procurement see listing under Special Equipment and Materials Used in AATCC Test Methods in the AATCC T ECHNICAL M ANUAL .
12.2 AATCC Perspiration Tester: Put all 21 glass or plastic plates into the unit regardless of the number of specimens. After the final glass or plastic plate is put in position on top, set the dual plates with compensating springs in position. Place a 3.6 kg (8.0 lb) weight on top making a total of 4.5 kg (10.0 lb) under the pressure plate. Lock the pressure plate in position by turning the thumb-screws. Remove the weight. Place the unit in the oven on its side, so that the plates and the specimens are vertical. Perspirometer: The plates are held in a ver- tical position between an indicating scale with a fixed metal plate at one end and an adjustable metal plate at the other end. By means of adjusting screws, the movable plate may be made to exert increasing pressure against the test specimens. When the desired pressure of 4.5 kg (10.0 lb) is indicated on the scale, lock the specimen unit by a set screw. The speci- men unit can now be removed from the sec- tion applying the pressure. Another specimen unit may be added to the pressure section and the loading procedure repeated.
12.3 The Atlas Motorized Laboratory Wringer (see 12.1) and the Kenmore Hand Wringer #7326 (Sears, Roebuck & Co.) are suitable.
12.4 Or immerse the test specimen in the test solution at room temperature, pass through squeeze rolls (wringer) and reimmerse. Repeat, if necessary, to attain thorough wetting out.
12.5 Classify according to the fiber showing the greatest stain.
12.6 For very critical evaluations and in cases of arbitration, ratings must be based on the Gray Scale for Staining.AATCC 106 pdf download.