ISO INTERNATIONAL STANDARD 4656 Second edition 2012-07-15 Rubber compounding ingredients Carbon black Determination of oil absorption number (OAN) and oil absorption number of compressed sample (COAN) Ingrédients de mélange du caoutchouc - Noir de carbone Determination de I'indice d'absorption d'huile (OAN) et de I'indice d'absorption d'huile d'échantillons comprimés (COAN) Reference number ISO 4656:2012(E) ISO @ISO 2012 IHS under ed without license from IHS Not for Resale ISO 4656:2012(E) COPYRIGHTPROTECTEDDOCUMENT ISO 2012 All rights reserved. Unless otherwise specified, 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 either ISO at the address below or ISO's member body in the country of the requester. ISO copyright office Case postale 56 · CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 4122 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland @ ISO 2012 -All rights reserved No reproductic etworking permitted without license from IHS Not for Resale ISO 4656:2012(E) Contents Page Foreword ..iv 1 Scope 2 Normative referenc 3 Principle. 4 Reagents .2 5 Apparatus 2 6 Sample preparation. .3 7 Conditions of test... 3 8 Procedure. 3 8.1 Checking of the absorptometer and constant-rate burette 3 8.2 Calibration and normalization of the absorptometer. 3 8.3 Testportion. 4 8.4 Determination. 5 6 Expression of results 5 10 Precision and bias. ..5 11 Test report. .5 Annex A (normative) Preparation of compressed test portions 7 Annex B (normative) Checking and adjustment of torque and hydraulic damping. .12 Annex C (normative) Checking of the constant-rate burette ..14 Annex D (informative) Precision and bias. .16 Bibliography .18 ili nse with ense from IHS Not for Resale