ISO INTERNATIONAL STANDARD 5637 Second edition 1989-11-15 Paper and board - Determination of water absorption after immersion in water Papier et carton -- Determination de I'absorption d'eau apres immersion dans I'eau Reference number ISO 5637 : 1989 (E) Copyrightlteatinal Organizatin for Standardization No reproduction or networking permitted without license from IHS Not for Resale ISO 5637 : 1989 (E) Foreword Iso (the International Organization for Standardization) is a worldwide federation of national standards bodies (Iso member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has mental 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 circulated to the member bodies for approval before their acceptance as International Standards by the ISo Council. They are approved in accordance with ISO procedures requiring at least 75 % approval by the member bodies voting. International Standard ISO 5637 was prepared by Technical Committee ISO/TC 6, Paper, board and pulps. This second edition cancels and replaces the first edition (ISO 5637 : 1978), clauses 4, 6, 7,8and9of whichhave beentechnicallyrevised ISO 1989 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 permission in writing from the publisher. International Organization for Standardization Case postale 56 . CH-1211 Geneve 20 · Switzerland Printed in Switzerland CopyightlInternational Organization for Standardization No reproduction or networking permitted without license from IHS Not for Resale INTERNATIONALSTANDARD ISO 5637 : 1989 (E) Paper and board Determination of water absorption after immersion in water 1 Scope Principle This International Standard specifies a method for the determi- Weighing the test piece before and after immersion in water nation of the water absorption of paper and board after total and caiculating the water absorption, in grams per square immersion in water fora specified time. metre, or the relative water absorption as the percentage in- crease in mass. The method is applicable to all types of paper and board which have a degree of water resistance.It is not applicable to very Reagent absorbent papers suchas toilet tissue. Water, freshly distlled or deionized, at 23 oC ± 1 oC. Keep in a NOTE -- The method is analogous to that specified in ISO 769 : 1972, closed container until required for use. Fibrebuilding boards Hardandmediumboards water absorption and of swelling in thickness after immersion in water. Apparatus 2 Normative references 6.1 Balance, accurate to 0,01 g. The following standards contain provisions which,through reference in this text, constitute provisions of this International masses, with both increasing and decreasing loads. Standard. At the time of publication,the editions indicated were valid. All standards are subject to revision, and parties to agreementsbased onthis International Standardareencouraged 6.2 Tank of water, large enough to hold at least 10 test to investigate the possibility of applying the most recent editions pieces in a vertical position, and thermostatically controlled of the standards indicated below. Members of IEC and ISO main- without circulation. tain registers of currently valid International Standards. Take care to ensure that the tank has been carefully washed ISo 186: 1985, Paper and board - Sampling to determine with the reagent water (see clause 5) so that it is free from sur- average quality. factants. ISO 187: 1977, Paper and board - Conditioning of test 6.3 Support system that prevents