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Comparison of testing methods for color fastness to washing of textiles

2019-08-21

Color fastness to washing refers to the ability of textile color to withstand various kinds of washing.This paper mainly analyzes the differences and similarities between GB/ t3921-2008 "color fastness to soap washing of textiles" and GB/ t12490-2007 "color fastness to household and commercial washing of textiles", as well as the selection techniques for testing the color fastness to washing of related textiles.

1. Standard for color fastness to washing

At present, GB/ t3921-2008, the latest standard of color fastness to washing of textiles in China, is a revision of GB/T3921.1 ~ 5-1997, which has been officially implemented since December 1, 2008.The new standard integrates the five parts of the original standard into one standard, and modifies and adjusts the selection of adhesive lining, the clarity of composite sample and the grading method.This standard has been modified by iso 125-c10:2006, international standard iso 125-c10:2006, fastness to washing of soaps or soaps and soaps.This is a small, fast test method for predicting color fastness to washing of textiles in a laboratory, with 5 test conditions from mild to severe, and the test temperature is 40 ~ 95℃.

Principle: the sample of the product is stitched together with one or two pieces of the prescribed coated fabric, and then put into the mixture of soap or soap and anhydrous sodium carbonate. At the specified time and temperature, the sample is first rinsed and agitated by Color Fastness Tester, then rinsed and dried.

2.Test standard for fastness to household and commercial washing

GB/ t12490-2007 "color fastness to household and commercial washing fastness to textiles" was revised by GB/ t12490-1990 and was officially implemented on July 1, 2008.This standard adopted iso105-c061994 "textile C06 part: fastness to household and commercial washing" standard, modified the control of the parameters related to the lining, test solution, and drying method.The method is suitable for testing the resistance of various kinds of textiles to ordinary household or commercial washing.The standard equipment requirements, operating procedures and lining selection of the instrument are the same as GB/ t3921-2008.The standard test solution used is different from GB/ t3921-2008.

The most frequently cited methods in China's product standards are A1S and B2S test conditions in the standards.A1S and B2S test conditions are applicable to hand washing and machine washing color fastness tests of textiles respectively. For example, A1S test conditions were cited in the washing color fastness tests of wool knitwear, low-wool blended and wool-like knitwear, and decorative fabrics.The B2S test conditions were cited by the method for testing the fastness to washing of machine-washable wool knitwear.

3. Comparison of color fastness standards to washing

Although both GB/ t3921-2008 and GB/ t12490-2007 are testing methods for fastness to washing, there are differences between them.

GB/ t3921-2008 is suitable for testing the color fastness to washing of all types of household textiles. The rating tool is standard gray sample card or spectrometer.

GB/ t12490-2007 is suitable for testing the fastness of home textiles to home and commercial washing.The single S test was close to one household and commercial washing, one conforming to M test, and nearly five household and commercial washing results not exceeding 70℃.The rating tool is standard grey sample card, detergent selection AATCC standard detergent WOB or ECE standard detergent without fluorescent whitening agent, can add anhydrous sodium carbonate, sodium perborate or sodium hypofluorite (lithium) when needed.

Therefore, before determining the fastness to washing, it is important to clarify the method and standard of the product to be tested, otherwise the test results are not comparable.In China's national standards and industry standards, the color fastness to washing is mainly used to evaluate the main and secondary components of the fabric.And in the export trade, the buyer will often use the most easily stained nylon or silk paste lining to test the fabric wash stain effect.Therefore, due to the different methods adopted for the same product, the test results of the same product are often quite different.

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