ISO INTERNATIONAL STANDARD 3386-2 Secondedition 1997-06-15 Flexible cellular polymeric materials Determination of stress-strain characteristics in compression : Part 2: High-density materials Materiaux polymeres alvéolaires souples -- Détermination de la caracteristique de contrainte-deformation relative en compression - Partie 2: Matériaux a masse volumique élevée (so Reference number ISO 3386-2:1997(E) national Organization for Standardization No reproduction or networking permitted without license from IHS Not for Resale 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 Standards is normally carried out through isO technical committees. Each member body interested in a subject for which a technical committee has been established has the right 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. Tnis 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). ISO1997 or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm,without permission inwritingfrom the publisher. InternationalOrganizationforStandardization Casepostale56.CH-1211Geneve20.Switzerland Internet X.400 C=ch; a=400net; p=iso; o=isocs; S=central Printed in Switzerland i Copyright No reproduction or networking permitted without Not for Resale ISO 3386-2:1997(E) INTERNATIONALSTANDARD 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. The compression stress-strain characteristic differs from the indentation hardness 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 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.