ISO INTERNATIONAL STANDARD 20299-3 First edition 2008-03-01 Film for wrapping rubber bales Part 3: Ethylene-propylene-diene rubber (EPDM), acrylonitrile-butadiene rubber (NBR) hydrogenatednitrile-butadiene rubber (HNBR), acrylic-ethylene rubber (AEM) and acrylic rubber (ACM) Emballagedesballesencaoutchouc- Partie3:Caoutchouc éthylene-propylene-diene (EPDM),caoutchouc butadiene-acrylonitrile (NBR),caoutchoucbutadiene-nitrile hydrogene (HNBR), caoutchouc éthylene acrylique (AEM) et caoutchouc acrylique (ACM) Reference number ISO 20299-3:2008(E) ISO @ISO2008 ISO20299-3:2008(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 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 parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In the COPYRIGHTPROTECTEDDOCUMENT @ISO2008 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-1211Geneva20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland ii @ ISO 2008 -All rights reserved ISO20299-3:2008(E) Foreword IsO (the International Organization for Standardization) is a worldwidefederation of national standards bodies (isO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been Electrotechnical Commission (IEC) onallmatters of electrotechnical standardization. InternationalStandardsaredraftedinaccordancewiththerulesgivenintheISO/lECDirectives,Part2 adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requiresapproval byat least 75%of the memberbodies casting avote 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. ISO20299-3waspreparedbyTechnical CommitteeISO/TC45,Rubberand rubberproducts,Subcommittee SC 3, Rawmaterials (including latex) foruse in the rubber industry. ISO 20299 consists of the following parts, under the general title Film for wrapping rubber bales: Part 1: Butadiene rubber (BR) and styrene-butadiene rubber (SBR) Part 2: Natural rubber Part3:Ethylene-propylene-diene rubber (EPDM),acrylonitrile-butadiene rubber (NBR),hydrogenated ISO 2008 - All rights reserved ii ISO20299-3:2008(E) Introduction Considerable quantities of synthetic rubber are prepared in crumb form. The crumbs are dried and then pressed into bales whilst still warm, at approximately 6o °C. The bales are then wrapped in a film and packed, often automatically, into crates. The wrapping film should be strong enough to withstand the stresses encountered during the wrapping and packing operations. It should not adhere to the film on the other bales under the combined effects of the heat fromthe rubber andtheweightofthebales.Duringstorage,the rubberwill flowandthefilm shouldbeableto withstand the stresses generated. Any failure of the film causes rubber-to-rubber adhesion, which in a 3o-bale crateleadstoa"one-tonnebale". their packaging for use. However, because it is difficult and uneconomic to strip the film from each bale, an ess