ISO INTERNATIONAL 4045 STANDARD IULTCS/IUC 11 Third edition 2018-05 LeatherChemicaltests Determination of pH and difference figure Cuir-Essais chimiques-Determination du pH etde I'indice de difference Referencenumbers IS0 4045:2018(E) IULTCS/IUC11:2018(E) ISO S IS02018 IS04045:2018(E) IULTCS/IUC 11:2018(E) COPYRIGHTPROTECTEDDOCUMENT @ISO2018 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:+4122749 0111 Fax: +41 22 749 09 47 Email: [email protected] Website: www.iso.org Published in Switzerland ii @ISo 2018-All rights reserved IS04045:2018(E) IULTCS/IUC11:2018(E) Contents Page Foreword .iv 1 Scope 1 2 Normative references 1 3 Terms and definitions ..1 4 Principle 1 5 Reagents. .1 6 Apparatus. 2 7 Samplingandpreparationofthesamples .2 8 Procedure. 2 Preparation of the extract. 2 8.1 8.2 CalibrationofthepHmeter. 3 8.3 DeterminationofthepHvalue 3 8.4 Determinationofthedifferencefigure 3 9 Test report .3 @ IS0 2018 - All rights reserved ii