ISO INTERNATIONAL STANDARD 2303 Sixth edition 2019-03 Isoprene rubber (IR) Non-oil- extended, solution-polymerized types Evaluation procedures Caoutchouc isoprene (IR) - Types polymérisés en solution et non étendus a I'huile -Méthode d'évaluation Reference number IS02303:2019(E) so @ IS0 2019 IS0 2303:2019(E) COPYRIGHTPROTECTEDDOCUMENT @ ISO 2019 All rights reserved. Unless otherwise specified, or required in the context of its implementation, 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 CP 401 : Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +4122 749 0111 Fax: +41 22 749 09 47 Email: [email protected] Website: www.iso.org Published in Switzerland ii @ IS0 2019 - All rights reserved IS0 2303:2019(E) Contents Page Foreword ..iv 1 Scope .1 2 Normative references .1 3 Terms and definitions ..1 4 Sampling and sample preparation .2 5 Physical and chemical tests on raw rubber 5.1 Mooney viscosity .2 5.2 Volatile matter. .2 5.3 Ash. .2 6 Preparation of the test mixes for evaluation ofisoprene rubbers .2 6.1 Standard test formulation .2 6.2 Procedure. .3 6.2.1 Equipment and procedure .3 6.2.2 Mill mixing procedures .3 6.2.3 Laboratory internal mixer (LIM) mixing procedure .5 7 Evaluation of vulcanization characteristics by a curemeter test .8 7.1 Using an oscillating-disc curemeter ..8 7.2 Using a rotorless curemeter ..8 8 Evaluation of tensile stress-strain properties of vulcanized test mixes ..8 9 Precision .9 10 Test report ..9 Annex A (informative) Precision data for both mill mixer and laboratory internal mixer ..10 Annex B (informative) Additional precision data for natural rubber ..12 Bibliography .14 @ IS0 2019 - All rights reserved iii