ISO INTERNATIONAL STANDARD 7323 Second edition 2006-09-15 Rubber,raw and unvulcanized compounded Determination of plasticity number and recovery number Parallel-plate method Caoutchouc brut et melanges non vulcanisés-Determination de I'indice de plasticite et de I'indice de recouvranceMethode des plateauxparalleles Reference number ISO7323:2006(E) SO O ISO2006 Coovriaht Intemational Oraanizationfor Standardization ISO 7323:2006(E) PDFdisclaimer This PDF fle may contain embedded typefaces.ln accordance with Adobe's licensing policy,this file may be printed or viewed but shall ot be edited unless the typefaces which are embedded arelicensed to and installed on the computer performing the editing.n downloading this fle,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 ofAdobe Systems Incorporated Details of the software products used to create this PDF fle can be found in the General Info relative to the file;the PDF-creation parameters were optimized for printing.Every care hasbeen taken to ensure that the fil is suitable for use by ISO member bodies.In ISO 2006 Allrights 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.+41227490111 Fax.+41227490947 E-mail [email protected] Web www.iso.org Published in Switzerland @ ISO 2006-All rights reserved Coviohtinatonal Oranization for Standardzaton ISO 7323:2006(E) Contents Page Foreword. iv 1 Scope 2 Normative references 3 Terms anddefinitions .. 4 Principle 5 Apparatus . 6 Testpieces 6.1 Preparation 6.2 Number 7 Testconditions 8 Procedure 8.1 General 8.2 Determination of plasticitynumber 8.3 Determination ofrecoverynumber .... Expressionofresults Plasticitynumber 9.2 Recovery number 10 Testreport Coovronh ntenatona oranlaon iorsandardzalon ghts reserved ii 7323:2006(E) ISO Foreword IsO (the International Organization for Standardization)is a worldwide federation of national standards bodies International Electrotechnical Commission(IEC)on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives,Part 2. The main task of technical committees is to prepare International Standards.Draft International Standards International Standard requires approval by at least75 %ofthe member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights.isO shall not beheld responsible for identifying any or all such patent rights. SC 2,Testing and analysis. This second edition cancels and replaces the first edition (ISO 7323:1985),which has been revised to update the normative references (ISO471andiSO3383 have been replacedby ISO 23529 and ISO 1796by ISO 1795).It also incorporates the Technical Corrigendum ISO 7323:1985/Cor.1:2003. OISO 2006-All rights reserved CooviohtrienalonalraanizafonforStandardzafion INTERNATIONALSTANDARD ISO 7323:2006(E) Rubber,raw and unvulcanized compounded Determination ofplasticitynumberandrecoverynumberParallel-plate method WARNING-Persons using this International Standard should be familiar with normal laboratory practice.This standard does not purport to address all of the safetyproblems,if any,associated with its use.lt is the responsibility of the userto establish appropriate safety and health practices and to ensure compliance with any national regulatory conditions. 1 Scope This International Standard specifies a method using the parallel-plate plastometer for the determination of the plasticity number and recovery number of uncompounded,compounded and reclaimed stocks of unvul