Friday, November 27, 2009

Colorfastness to washing: Test 4

This part of ISO 105 specifies Test No. 4 of a series of five washing tests that have been established to investigate the fastness to washing of coloured textiles and which between them cover the range of washing procedures from mild to severe.
Principle
A specimen of the textile in contact with one or two specified adjacent fabrics is mechanically agitated under specified conditions of time(40 min ± 2 min) and temperature(95 oC ± 2 oC. ) in a soap solution(containing 5 g of soap and 2 g of anhydrous sodium carbonate per litre of water.), then rinsed and dried. The change in colour of the specimen and the staining of the adjacent fabric(s) are assessed with the grey scales.

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