ISO/TR TECHNICAL REPORT 7620 Second edition 2005-05-15 Rubber materials Chemical resistance Matériaux en caoutchouc Résistance chimique Reference number ISO/TR 7620:2005(E) So @ ISO 2005 ISO/TR 7620:2005(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The Iso Central Secretariat accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation ? ISO2005 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 + 41 22 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland @ ISO 2005 - All rights reserved ISO/TR7620:2005(E) Contents Page Foreword. Introductior 1 Scope. 2 Types of chemical and physical change 3 Rubber polymers. 4 Chemicals .. 3 5 Effectofserviceconditions. 6 Criteria applied for the ranking of chemical resistance.. 7 Chemical resistance of rubber materials. 8 Methods for the evaluation of chemical resistance .... 5 9 Chemical resistance, 8 Annex A (informative) Effect of compounding variations on chemical resistance . 32 Annex B (informative) References in Table 2 34 Annex C (informative) References in Table 3 . .35 izalion'ghts reserved ii ISO/TR7620:2005(E) Foreword Iso (the International Organization for Standardization) is a worldwide federation of national standards bodies (isO;member bodies). The work of preparing International Standards is normally carried out through IsO technicalcommittees.Eachmemberbodyinterestedinasubjectforwhichatechnical committeehasbeen non-governmental, in liaison with iso, also take part in the work. Iso collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/lE Directives, Part 2 The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. In exceptional circumstances, when a technical committee has collected data of a different kind from that simple majority vote of its participating members to publish a Technical Report. A Technical Report is entirely informative in nature and does not have to be revieweduntil the data it providesare considered to be no longer valid or useful. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. IsO shall not be held responsible for identifying any or all such patent rights. ISO/TR 7620 was prepared by Technical Committee ISO/TC 45, Rubber and rubber products, Subcommittee SC 4, Products (other than hoses). This second edition cancels and replaces the first edition (ISO/TR 7620:1986), which has been technically revised. @ ISO 2005 - All rights reserved ISO/TR 7620:2005(E) Introduction A wide range of rubber products are used in contact with liquids and other chemicals, in some cases throughout their service life, and thus require suitably resistant rubber formulations. Rubber hoses are used to diverse as printing inks, paper pulp and tex