ISO INTERNATIONAL STANDARD 15023-2 Second edition 2019-02 Plastics Poly(vinyl alcohol) (PVAL) materials - Part 2: Determination of properties Plastiques - Matériaux en poly(alcool de vinyle) (PVAL) - Partie 2: Détermination des propriétés Reference number ISO 15023-2:2019(E) so @ IS0 2019 IS0 15023-2:2019(E) COPYRIGHTPROTECTEDDOCUMENT @ ISO 2019 All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either IsO at the address below or Iso's member body in the country of the requester. ISO copyright office CP 401 : Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +4122 749 0111 Fax: +41 22 749 09 47 Email: copyright@iso.org Website: www.iso.org Published in Switzerland ii @ IS0 2019 - All rights reserved IS0 15023-2:2019(E) Contents Page Foreword .iv 1 Scope 1 2 Normative references ..1 3 Terms and definitions ..1 4 Determination of properties Annex A (normative) Determination of volatile-matter content 3 Annex B (normative) Determination of sodium acetate content ..5 Annex C (normative) Calculation of ash .8 Annex D (normative) Determination of degree of hydrolysis .9 Annex E (normative) Determination of viscosity of 4 % aqueous solution by the Brookfield test method or the inclined-tube falling-ball method 12 Bibliography .18 IS0 2019 - All rights reserved iii