1 Scope
1.1 This standard specifies a method for determining resistance of the color of textiles of all kinds and in all forms to dry cleaning.
1.2 This method is not suitable for the evaluation of the durability of the textile finishes, nor is it intended for use in evaluating the resistance of color to spot and stain removal procedures used by the dry-cleaner.
1.3 this method covers color fastness to dry cleaning only; commercial dry-cleaning practice involves other operations such as water spotting, solvent spotting, steam pressing, etc. , for which other standard test methods are available if the full "dry cleanability" of the textile is to be assessed.
1.4 the presence of absorbed water in either the fabric or the dry-cleaning solution, or the presence of a detergent and water in the dry-cleaning solution, has not been found to be a critical factor in assessing color fastness. This test gives results which correlate satisfactorily with those obtained in commercial dry cleaning.
1.5 fastness to dry cleaning, without further qualification, means fastness to dry cleaning in chloroethylene. However, if required, other solvents may be used.
2 Normative Standards
The following standards contain provisions which, through reference in this text, constitute provisions of this standard. At time of publication, the editions indicated were valid. All standards are subject to revision, and Parties concerned are encouraged to discuss the possibility of applying the latest edition of the following standards.
GB 250 - 1995 Gray scale for assessing change in color (idt ISO 105-02:1993)
GB 251 - 1995 Gray scale for assessing staining (idt ISO 105-A03: 1993)
GB / T 6151 - 1997 Textiles-Tests for color fastness-General principle of testing (eqv ISO 105-A01:1994)
3 Principles
A specimen of the textile in contact with a cotton fabric bag together with non-corrodible steel is agitated in perchlorethylene (see 1.3 to 1.5), then squeezed or centrifuged, and dried in hot air. The change in color of the specimen is assessed with the grey scale for assessing change in color. At the conclusion of the test, the coloration of the solvent is assessed by comparing the filtered solvent with unused solvent by transmitted light, by means of the grey scale for assessing staining.
4 Apparatus and Materials
4.1 suitable mechanical devices: consisting a water bath containing a rotatable shaft which supports, radially, glass or stainless steel containers (4.2), the bottom of the container being 45mm mm± 10mn from the center of the shaft. The shaft/container assembly is rotated at a frequency of 40rmin± 2r/min. the temperature of the water bath is thermostatically controlled to maintain the test solvent at 30℃±2℃.
Note: other mechanical devices may be used for the test, provided that the results are identical with those obtained by the apparatus described here.
4.2 glass or stainless steel containers, of 75mm± 5 diameter and 125mm± 10mm high, 550mL± 50mL capacity, which shall be closed using solvent-resistant gaskets.
4.3 non-corrodible (stainless) steel discs: 30 mm± 2mm, smooth and free from rough edges, of mass 20 g± 2g.
4.4 Undyed cotton "twill" cloth of mass per unit area270g/m2 ±70g/m2, free from finishes and cut into samples measuring 120mm× 120mm.
4.5 tetrachloroethylene, which shall be stored over anhydrous sodium carbonate to neutralize any hydrochloric acid formed.
4.6 Gray scale for assessing change in color, complying with GB 250 Gray scale for assessing staining and GB 251.
4.7 colorimetric tubes, of diameter 25mm
