BS ISO 105-X19:2020 pdf free.Textiles – Tests for colour fastness.Colour fastness to rubbing (Gakushin test method).
BS ISO 105-X19 This document specifies the test method for determining the resistance of the colour of textiles of all kinds to rubbing off and staining other materials using convex specimen stage (Gakushin test method). Two test methods are specified, one with a dry rubbing cloth and one with a wet rubbing cloth.This document is applicable to textiles made from all kinds of fibres in the form of yarn or fabric, including textile floor coverings and other pile fabrics, whether dyed or printed.If the textile to be tested is a fabric or textile floor covering, two pieces not less than 220 mm x 30 mm are required for dry rubbing and wet rubbing. Additional test specimens may be used when higher precision is needed. One test specimen of each pair shall have the long direction parallel to the warp yarns [or in the direction of manufacture), the other parallel to the weft ([or filling yarns or at right angles to the direction of manufacture]. An alternate method of cutting test specimens is to cut the long dimension diagonally to warp and weft. If the pile lay of a carpet specimen is distinguishable, cut the test specimen with the pile lay pointing in the long direction.If the textile to be tested is yarn or thread, two pieces knit it into fabric to provide test specimens of at least 220 mm x 30 mm or form a layer of parallel strands by wrapping it lengthways on a cardboard rectangle of suitable dimensions for dry rubbing and wet rubbing. Wrapped cardboard shall be adhered to the convex specimen stage.When testing multi-coloured textiles, care should be taken to position the specimens in such a way that all colours of design are rubbed. Alternatively, if the areas of colour are sufficiently large, more test specimens may be taken, and the individual colours assessed separately. BS ISO 105-X19 pdf download.