ISO 15700 pdf download.Leather — Tests for colour fastness — Colour fastness to water spotting
1 Scope
This International Standard specifies a method for assessing the effect, on leather of all kinds, caused by spotting with water. The method is suitable for assessing the change in physical appearance and the colour change of the leather.
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 standards 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-A05:1 996, Textiles — Tests for colour fastness — Part A05: Instrumental assessment of change in colour for determination of grey scale rating. ISO 3696:1 987, Water for analytical laboratory use — Specification and test methods.
3 Principle
Two drops of distilled water are placed at separate spots on the leather. After 30 min, any surplus water is removed with filter paper from one of the drops and any physical effects are observed. The other drop is allowed to evaporate overnight and the change in colour of the leather is assessed with the standard grey scale. Since the finish of a patent leather and other plastic coated leathers is impervious to water, an alternative procedure is required in which the water spot are placed on the inside surface of the leather. The general colour fastness testing principles 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 Pipette, to deliver water drops of approximately 0,1 5 ml. 4.2 Water, grade 3 as defined in ISO 3696. 4.3 Grey scale for assessing change in colour, in accordance with ISO 1 05-A02. NOTE 1 If a suitable instrumental system is available for measuring the change in colour in accordance with ISO 1 05-A05, this may be used instead of the visual assessment method.
5 Test specimen
Take a specimen of leather, at least 1 00 mm x 50 mm in size, which is representative of the piece of leather available for testing.
6 Procedure (for patent leathers, see clause 7)
6.1 Place the specimen on a flat surface with the surface to be tested uppermost. Normally this will be the side corresponding to the outside of the leather article to be produced from the piece of leather. 6.2 With the pipette (4.1 ) place two drops (each approximately 0,1 5 ml) of water (4.2) approximately 50 mm apart on the surface of the specimen. 6.3 After 30 min remove the residual water (if any) from one spot by gently blotting with filter paper and note any physical effects the water has had on the leather. NOTE 2 The physical effects which may be observed include swelling and loss of lustre. To detect these, it may be necessary to observe the leather from all directions. Describe the severity of the effect using one of the following terms: slight, moderate, or severe.6.4 After allowing the specimen to stand for 1 6 h, assess, either visually in accordance with ISO 1 05-A02 or instrumentally in accordance with ISO 1 05-A05, the grey scale rating corresponding to the change in colour of that part of the specimen which was spotted with the second drop. To assess the permanence of the colour change, subject the leather surface to a light manual treatment as described below and again assess the change in colour using the grey scale. (Subject the leather to the type of manual treatment normally applied by the end user to this type of leather. For example, polish shoe upper leathers lightly with a clear wax shoe polish, stake upholstery, gloving and clothing leathers lightly and brush suede leathers lightly.)