ISO INTERNATIONAL STANDARD 8312 Secondedition 2015-09-15 Rubber compounding ingredients - Stearic acid Definition and test methods Ingrédients de meélange du caoutchouc - Acide stéarique - Définition et méthodes d'essai Reference number IS0 8312:2015(E) ISO @IS02015 IS0 8312:2015(E) COPYRIGHTPROTECTEDDOCUMENT @ IS0 2015, Published in Switzerland All rights reserved. Unless otherwise specified, 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 Ch. de Blandonnet 8 . CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax+4122 749 09 47 copyright@iso.org www.iso.org @ IS0 2015 - All rights reserved Copvriaht Inte IS0 8312:2015(E) Contents Page Foreword ..iv 1 Scope ..1 2 Normative references ..1 3 Terms and definitions ..2 4 Sampling .2 5 Physical and chemical properties .2 6 Testreport ..2 Annex A (normative) Determination of ash at 550 C ± 25 °C .4 Annex B (normative) Determination of copper content - Atomic absorption spectrometric method 6 Annex C (normative) Determination of manganese content - Atomic absorption spectrometricmethod 8 Annex D (normative) Determination of iron content - Atomic absorption spectrometric method .10 Annex E (normative) Determination of nickel content - Atomic absorption spectrometric method 12 Annex F (normative) Determination of mineral acidity - Titrimetric method. ..14 Annex G (normative) Determination of copper content - Molecular absorption spectrometric method ..16 Annex H (normative) Determination of manganese content - Molecular absorption spectrometric method. .17 AnnexJ (normative) Determination of iron content - Molecular absorption spectrometric method.. .18 Annex K (normative) Determination of nickel content - Molecular absorption spectrometric method ..19 Annex L (normative) Classification of stearic and stearic acid/palmitic acid blends and typical physical and chemical properties .20 Bibliography .22 nisn Sadardizaon rights reserved iii