ISO INTERNATIONAL STANDARD 105-X08 Fourth edition 1994-09-01 Textiles -- Tests for colour fastness Part X08: Colour fastness to degumming Textiles -- Essais de solidite des teintures Partie X08: Solidité des teintures au décreusage ISO Reference number ISO 105-X08:1994(E) ISO105-X08:1994(E) Foreword federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through IsO which a technical committee has been established has the right to be re- and non-governmental, in liaison with IsO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technicai committees are circulated to the member bodies for voting. Publication as an International a vote. iSO/TC 38, Textiles, Subcommittee SC 1, Tests for coloured textiles and colorants. This fourth and d repiacesthe edition cancels third edition (ISO 105-X08:1987), of which it constitutes a technicat revision. a letter (e.g. "Part A"), with publication dates between 1978 and 1985. Each part contained a series of "sections", each designated by the re- spective part letter and by a two-digit serial number (e.g. "Section Ao1"). These sections are now being republished as separate documents, them- nations. A complete list of these parts is given in isO 105-A01. ISO1994 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced orutilized in any form orbyanymeans,electronic ormechanical,including photocopyingand microfim, without permission in writing from the publisher. International Organization for Standardization Case Postale 56 · CH-1211 Geneve 20 · Switzerland Printed in Switzerland ii INTERNATIONAL STANDARD ISO ISO 105-X08:1994(E) Textiles Tests for colour fastness Part X08: Colour fastness to degumming 1 Scope fabrics is treated with a soap solution, then rinsed and dried. The change in colour of the specimen and the This part of ISO 105 specifies a method for deter- staining of the adjacent fabrics are assessed by com- mining the resistance of the colour of textiles of all parison with the grey scales. kinds, except loose fibre, to the action of soap sol- utions such as those used in degumming raw silk. 4 Apparatus and reagents 4.1 Vessel, of capacity 500 ml, with appropriate re 2 Normative references flux condenser. The following standards contain provisions which, 4.2 Soap, containing not more than 5 % moisture throughreferenceinthistext,constituteprovisions and complying with the following requirements based of isO 105. At the time of publication, the editions indicated were valid. All standards are subject to re- on dry mass: vision, and parties to agreements based on ISO 105 - free aikali, calculated as Na2CO3: 0,3 g/kg maxi- are encouraged to investigate the possibility of apply- mum; ing the most recent editions of the standards indi- cated below. Members of IEC and ISO maintain free alkali, calculated as NaOH: 1 g/kg maximum; registers of currently valid International Standards. - total fatty matter: 850 g/kg minimum; ISO 105-A01:1994, Textiles Tests for colour fast ness --- Part A01: General principles of testing. titre of mixed fatty acids prepared from soap: 30 °C maximum; ISO 105-A02:1993, Textiles - Tests for colour fast- ness-Part Ao2:Greyscale forassessing change in iodine value: 50 maximum. colour. The soap shall be free from fluorescent brightening ISO 105-A03:1993, Textiles — Tests for colour fast- agents. ness - Part A03: Grey scale for assessing staining. ISO 105-F:1985, Textiles - Tests for colour fastness 4.3 Soap solution, containing 7 g of soap (4.2) per litre of grade 3 water (4.5). - Part F: Standard adjacent fabrics. 4.4 Sodium carbonate, anhydrous (Na2CO3) 3 Principle 4.5 Grade 3 water, (see ISO 105-A01:1994, sub- clause 8.1). A specimen of the textile in contact with adjacent 1