ISO INTERNATIONAL STANDARD 5630-3 Secondedition 1996-06-15 Paper and board Accelerated ageing - Part 3: Moist heat treatment at 80 C and 65 % relative humidity Papier et carton -- Vieillissement accéleré - Partie 3: Traitement a la chaleur humide a 80 °C et 65 % d'humidité relative Reference number ISO 5630-3:1996(E) No reproduction or networking permitted without license from IHS Not for Resale ISO 5630-3:1996(E) Foreword erationofnationalstandardsbodies (lsOmemberbodies).Theworkof preparing International Standards is normally carried out through iso technical committees. Each member body interested in a subject for resented on that committee. International organizations, governmental and non-governmental, in liaison with IsO, also take part in the work. Iso coi- laborates closely with the International Electrotechnical Commission (IEC) onall matters ofelectrotechnicalstandardization. Draft International Standards adopted by the technical committees are cir- culated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard ISO 5630-3 was prepared by Technical Committee ISO/TC 6, Paper, board and pulps, Subcommittee SC 2, Test methods and quality specifications for paper and board. This second editioncancelsandreplaces the first edition (IS0 5630-3:1986), which has been technically revised. ISO 5630 consists of the following parts, under the general title Paper and board Accelerated ageing: Part 1: Dry heat treatment at 105 °C Part 3: Moist heat treatment at 80 °C and 65 % relative humidity Part 4: Dry heat treatment at 120 °℃ or 150 ℃ Annexes A and B of this part of ISO 5630 are for information only. @ISO1996 duced or utilized in any form or by any means, electronic or mechanical, including photo- copying and microfilm, without permission in writing from the publisher. International Organization forStandardization CasePostale56CH-1211Geneve20Switzerland Printed in Switzerland Copyright International Organization for Standardization Not for Resale @ ISO ISO 5630-3:1996(E) Introduction Exposure of paper or board to a hostile environment, such as some types of radiation, elevated temperature, or chemical attack over a period of hours, may provide information concerning the natural changes that may occur in the material over a period of years.[1, 2] Hostile environments that have been used include dry heat, heat and moisture, visible and ultraviolet radiation, and sulfur dioxide gas. Properties compared before and after such exposure include mechanical chemicalandoptical properties It has been determined that the degradation of cellulose is very sensitive to moisture.[3,4] The rate of degradation increases about 25 % when the relative humidity increases from 60 % to 70 %. In order to be representa- tive of natural conditions in many countries where conditions of high hu- midity, and perhaps high temperature, are common, it is desirable that in an accelerated ageing atmosphere paper should have the same moisture content as in a natural ageing atmosphere.[5,6] For this reason, after studying the ageing of many papers under different conditions of tempera- ture and relative humidity, 80 °C and 65 %relative humidity have been se- lected[5, 6] for tests of accelerated ageing. ii CoyghematinalrganizationoSandardizaton No reproduction or networking permitted without license from IHS Not for Resale