This Standard specifies a method for determining the resistance of the colour of textiles of all kinds to the action of active chlorine in such concentrations as used to disinfect swimming-pool water.
Three alternative test conditions are specified. The active chlorine concentrations of 50 mg/l and 100 mg/l are intended for swimwear, and 20mg/L intended for accessories such as beach robes and towels.
2 Normative References
The following documents are essential for the application of this Standard. For the dated normative references, only the dated editions are applicable to this document. For the undated normative references, the latest editions (including all amendments) apply.
GB/T 250 Grey Scale for Assessing Change in Colour in Textiles Tests for Colour Fastness (GB/T 250-2008, ISO 105-A02: 1993, IDT)
GB/T 6682 Water for Analytical Laboratory Use - Specification and Test Methods (GB/T 6682-2008, ISO 3696: 1987, MOD)
FZ/T 01024 Instrumental Assessment Method for Discoloration of Specimen (FZ/T 01024-1993, neq ISO 105-A05: 1992)
3 Principle
A specimen of the textile is treated with a weak chlorine solution of a given concentration and dried; one of three alternative test conditions are specified. The change in colour of the specimen is assessed by comparison with the grey scale or colorimeter.
4 Apparatus
4.1 Suitable mechanical device, consisting of a water bath containing a rotatable shaft which supports, radially, glass or stainless steel containers with a diameter of (75 ± 5) mm and a height of (125 ± 10) mm of (550 ± 50) ml capacity, the bottom of the containers being (45 ± 10) mm from the center of the shaft. The shaft/container assembly is rotated at a frequency of (40 ± 2) min. The temperature of the water bath is thermostatically controlled to maintain the test solution at the prescribed temperature ±2℃.
