ISO 15702 pdf download.Leather — Tests for colour fastness — Colour fastness to machine washing
1 Scope
This International Standard specifies a method for determining the resistance of leather to washing in a washing machine under specified conditions. The method is suitable for assessing the change in colour of the leather, the staining of an adjacent textile fabric and any change in the finish of the leather. This method can also be used in leather preparation for assessing the change in any other physical or chemical property during machine washing.
2 Normative references
The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the standard indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 1 05-A01 :1 994, Textiles — Tests for colour fastness — Part A01 : General principles of testing. ISO 1 05-A02:1 993, Textiles — Tests for colour fastness — Part A02: Grey scale for assessing change in colour. ISO 1 05-A03:1 993, Textiles — Tests for colour fastness — Part A03: Grey scale for assessing staining. ISO 1 05-A04:1 989, Textiles — Tests for colour fastness — Part A04: Method for the instrumental assessment of the degree of staining of adjacent fabrics.
3 Principle
A composite specimen of the leather and an adjacent textile fabric is agitated together with PTFE rods in washing liquor, rinsed and then squeezed and dried. The change in colour of the specimen and the adjacent textile fabric are assessed with the standard grey scale and, if applicable, any changes in the finish are noted. The general colour fastness testing principles used are in accordance with those described in ISO 1 05-A01 , taking into account the differences between textile substrates and leather.
4 Apparatus and materials
Ordinary laboratory apparatus and 4.1 Test apparatus 1 ) , consisting of a rotating drum of capacity approximately 500 ml made typically of glass or stainless steel and sealed with solvent-resistant rubber gaskets. 4.2 PTFE rods 2) , 20 mm ± 2 mm long, 7 mm to 9 mm in diameter. 4.3 Plain-weave fabric, measuring 1 00 mm x 36 mm, for use as adjacent fabric. NOTE 1 Type DW multifibre fabric 2) as specified in ISO 1 05-F1 0 is normally used. 4.4 Detergent 2) , usually ECE Colour Fastness Test Detergent 77 or equivalent. 4.5 Water, grade 3 in defined in ISO 3696. 4.6 Grey scale for assessing staining, in accordance with ISO 1 05-A03, and grey scale for assessing change in colour, in accordance with ISO 1 05-A02. NOTE 2 If a suitable instrumental system is available for measuring the change in colour in accordance with ISO 1 05-A04 and ISO 1 05-A05, this may be used instead of the visual assessment method.
5 Test specimen
If the piece of leather available for testing is a whole hide or skin, then first take a sample in accordance with IUP 2. Take a specimen of leather measuring 1 00 mm x 36 mm which is representative of the piece of leather available for testing. NOTE 3 If the same specimen of leather is required for other chemical or physical tests after the mild washing treatment, for example to assess the dimensional stability after mild washing, then a larger specimen will be more appropriate. Assemble the composite specimen by placing the piece of adjacent fabric (4.3) over the leather specimen and attaching them together, for example by inserting two steel staples or stitching them together with a thread, at the narrow ends of the leather specimen. Attach the adjacent fabric to the flesh side of grain leathers and to the side worn inside for other leathers.