INTERNATIONAL ISO STANDARD 105-N04 Second edition 1993-10-01 Textiles - Tests for colour fastness Part N04: Colour fastness to bleaching: Sodium chlorite (severe) Textiles - Essais de solidité des teintures - Partie N04: Solidité des teintures au blanchiment: Chlorite de sodium (essai fort) SO Reference number ISO105-N04:1993(E) No reproduction or networking permited without license from IHS Not for Resale ISO105-N04:1993(E) Foreword IsO (the International Organization for Standardization) is a worldwide of preparing International Standards is normally carried out through IsO represented on that committee. International organizations, governmental 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 technical committees are Standard requires approval by at least 75 % of the member bodies casting a vote International Standard ISO 105-N04 was prepared by Technical Committee ISO/TC 38, Textiles, Sub-Committee SC 1, Tests for coloured textiles and colorants. This second edition cancels and replaces the first edition (included in ISO 105-N:1978), of which it constitutes a minor revision. Each part contained a series of "sections", each designated by the re- These sections are now being republished as separate documents, them- nations. A complete list of these parts is given in IsO 105-A01. ISO 1993 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without per. mission in writing from the publisher. International Organization for Standardization Case Postale 56 . CH-1211 Geneve 20 · Switzerland Printed in Switzerland CopyrightInternationalOrganizationfor Standardization No reproduction or networking permited without license from IHS Not for Resale ISO 105-N04:1993(E) INTERNATIONALSTANDARD Textiles - Tests for colour fastness Part N04: Colour fastness to bleaching: Sodium chlorite (severe) 1 Scope 3Principle This part of ISO 105 specifies a method for deter- A specimen of the textile in contact with one or two mining the resistance of the colour of natural cellulose specified adjacent fabrics is treated in a sodium textiles to the action of severe bleaching with sodium chlorite solution, rinsed and dried. The change in chlorite as ordinarily employed in textile processing. colour of the specimen and the staining of the adja- cent fabric(s) are assessed with the grey scales 2 Normative references Apparatus and reagents The following standards contain provisions which, through reference in this text, constitute provisions of this part of ISO 105. At the time of publication, the 4.1 Glass container, fitted with a reflux condenser editions indicated were valid.All standards are subject or other means of reducing evaporation of the bath to revision, and parties to agreements based on this thus preventing the need to modify the bath during part of ISO 105 are encouraged to investigate the possibility of applying the most recent editions of the the test. standards indicated below. Members of IEC and ISO maintain registers of currently valid International 4.2 Sodium chlorite solution, 2,5 g/l, containing Standards. O,1 g of acid sodium pyrophosphate per litre, brought to pH 3,5 with formic acid immediately before the ISO 105-A01:1989. Textiles Testsforcolourfast- ness -- Part Ao1: General principles of testing. test. The exact concentration of the sodium chlorite em- SO105-A02:1993,Textiles- -Tests for colour fast- ployed is determined by titration with sodium ness - Part Ao2: Grey scale for assessing change in thiosulfate solution. colour. ISO 105-A03:1993, Textiles - - Tests for colour fast- 4.3 Adjacent fabrics (see 1SO 105-A01:1989, sub- ness Part Ao3: Grey scale for assessing staining. clause 8.3). ISO 105-F:1985, Textil