ISO INTERNATIONAL STANDARD 20494 First edition 2017-12-01 Paper Requirements for stability for general graphic applications Papier - Exigences pour évaluer la stabilité pour les applications graphiques generales Reference number A IS0 20494:2017(E) ISO @ IS0 2017 IS0 20494:2017(E) COPYRIGHTPROTECTEDDOCUMENT IS0 2017,Published in Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form written permission. Permission can be requested from either ISO at the address below or ISO's member body in the country of the requester. IsOcopyrightoffice Ch. de Blandonnet 8 . CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +41 22 749 09 47 [email protected] www.iso.org ii @ IS0 2017 - All rights reserved IS0 20494:2017(E) Contents Page Foreword ..iv Introduction. ..V 1 Scope. ..1 2 Normative references ..1 3 Terms and definitions ..1 4 Principle ..2 5 Sampling. .2 6 Requirements for paper stability .2 6.1 Tearing resistance .2 6.1.1 Conditioning .2 6.1.2 Tear testing. .2 6.2 Retention of tearing resistance 6.3 Alkalireserve .3 6.4 pH value of aqueous extract .3 7 Precision ..3 8 Test report. ..3 9 Statement of compliance ..4 10 Related information ..4 Annex A (informative) Precision. AnnexB(informative)Effectofacceleratedageingonopticalproperties ..9 Annex C (informative) International Standards on paper permanence, archival paper permanence and durability, and on stability for general graphic applications ..10 Annex D (informative) Accelerated ageing tests ..12 Annex E (informative) Statement of compliance ..13 Bibliography .14 @ IS0 2017 - All rights reserved iii