ISO INTERNATIONAL STANDARD 7270-2 Second edition 2012-09-15 Rubber Analysis by pyrolytic gas- chromatographic methods Part 2: Determination of styrene/butadiene/ isoprene ratio Caoutchouc Méthodes d'analyse par pyrolyse et chromatographie en phasegazeuse- Partie2: Détermination du rapport styrene/butadiene/isoprene Reference number ISO 7270-2:2012(E) LSO @ ISO 2012 Not for Resale ISO 7270-2:2012(E) COPYRIGHTPROTECTEDDOCUMENT ISO2012 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 Casepostale56·CH-1211Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyright@iso.org Web www.iso.org Published in Switzerland @ ISO 2012 -All rights reserved No reproductic etworking permitted without license from IHS Not for Resale ISO 7270-2:2012(E) Contents Page Foreword ..iv 1 Scope 2 Normative references 3 Principle. 4 Reagents. 5 Apparatus.. .2 5.1 Extraction apparatus. 5.2 Pyrolysis/gas chromatography system.. 2 6 Procedure... 3 6.1 Preparation of test samples from calibration samples and unknown sample 3 6.2 Test conditions.... 6.3 Preparation of calibration curves 6.4 Analysis of the unknown sample. 7 Expression of results 8 8 Precision 8 9 Test report 8 Annex A (informative) Precision 9 Bibliography ili se with IS ut license from IHS Not for Resale