ISO INTERNATIONAL 3386-2 STANDARD Second edition 1997-06-15 Flexible cellular polymeric materials -- Determination of stress-strain characteristics in compression - Part 2: High-density materials Materiaux polymeres alveolaires souples -- Détermination de la caracteristique de contrainte-deformation relative en compression - Partie 2: Matériaux a masse volumique élevée ISO Reference number ISO 3386-2:1997(E) Not for Resale without license from IHS ISO 3386-2:1997(E) Foreword IsO (the International Organization for Standardization) is a worldwide federation of national standards bodies (IsO member bodies). The work of preparing International to be represented on that committee. International organizations, governmental and non-governmental, in liaison with IsO, also take part in the work. IsO collaborates closely with the International Electrotechnical Commission (lEC) on all matters of electrotechnical standardization. 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. International Standard ISO 3386-2 was prepared by Technical Committee ISO/TC 45, Rubber and rubber products. This second edition cancels and replaces the first edition (ISO 3386-2:1984), of which it constitutes a minor revision (in clause 4, second paragraph, the accuracy required for measurement of the test piece thickness has been changed from 0,02 mm to 0,1 mm). CISO 1997 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 the publisher. International Organization for Standardization Case postale 56 . CH-1211 Geneve 20 : Switzerland Internet [email protected] X.400 C=ch; a=4oOnet; p=iso; o=isocs; S=central Printed in Switzerland ii Not for Resal ISO 3386-2:1997(E) INTERNATIONAL STANDARD @ ISO Flexible cellular polymeric materials -- Determination of stress-strain characteristics in compression : Part 2: High-density materials 1 Scope This part of IsO 3386 specifies a method for the determination of the compression stress-strain characteristics of flexible cellular polymeric materials of density greater than 250 kg/m². The compression stress-strain characteristic is a measure of the load-bearing properties of the material, though not necessarily of its capacity to sustain a long-term load. characteristics (as determined in accordance with IsO 2439) which are known to be influenced by the thickness and the tensile properties of the flexible cellular material under test, the shape of the compression piate, and the shape and size of the test piece IsO 3386-1 specifies a method for low-density flexible materials, and differs from Part 2 in the following ways: Part 1 is concerned with materials of density up to 250 kg/m3, whilst Part 2 is mainly concerned with materials of density above 250 kg/m°; compression stress values have been deleted from Part 2; Part 2 does not allow the use of a cylindrical test piece. This part of isO 3386 is a general method for testing denser flexible cellular materials (i.e. expanded cellular rubbers), measurements being made on one of more points on the steeply rising part of the stress-strain curve. The shape factor of the test piece is important and comparative test results can only be obtained on test pieces having the same shape factor. NOTE 1 For comparison purposes, the method may be used for material of 15o kg/m3 density or greater Copyright International Organization for Standardization