EN ISO 2439:2000

SLOVENSKI STANDARD
01-junij-2001
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Flexible cellular polymeric materials - Determination of hardness (indentation technique)
(ISO 2439:1997, including Technical Corrigendum 1:1998)
Weich-elastische polymere Schaumstoffe - Bestimmung der Härte (Eindruckverfahren)
(ISO 2439:1997, einschließlich Technische Korrektur 1:1998)
Matériaux polymeres alvéolaires souples - Détermination de la dureté (technique par
indentation) (ISO 2439:1997, Rectificatif Technique 1:1998 inclus)
Ta slovenski standard je istoveten z: EN ISO 2439:2000
ICS:
83.100 Penjeni polimeri Cellular materials
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

IS0
INTERNATIONAL
STANDARD
Third edition
1997009- 15
Flexible cellular polymeric materials -
Determination of hardness (indentation
technique)
Matkiaux polymbres alv6olaires soup/es - Dbtermination de la duet6
(technique par indentation)
Reference number
IS0 2439: 1997(E)
IS0 2439: 1997(E)
Foreword
IS0 (the International Organization for Standardization) is a worldwide federation of national standards bodies (IS0
member bodies). The work of preparing international Standards is normally carried out through IS0 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. IS0 collaborates closely with the International Electrotechnical
Commission (IEC) 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 IS0 2439 was prepared by Technical Committee lSO/TC 45, Rubber and rubber products.
This third edition cancels and replaces the second edition (IS0 2439:1980), which has been technically revised.
0 IS0 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 l CH-1211 Geneve 20 l Switzerland
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Printed in Switzerland
ii
INTERNATIONAL STANDARD o iso IS0 2439: 1997(E)
Flexible cellular polymeric materials - Determination of hardness
(indentation technique)
- Persons using this International Standard should be familiar with normal laboratory practice.
WARNING
This standard does not purport to address all of the safety problems, if any, associated with its use. It is the
responsibility of the user to establish appropriate safety and health practices and to ensure compliance
with any national regulatory conditions.
1 Scope
This International Standard specifies three methods for determining the indentation hardness of flexible cellular
materials:
method A (indentation hardness index), which gives a single indentation measurement for laboratory test purposes;
method B (indentation hardness characteristics), which provides information about the shape of the hardness
indentation curve;
method C (indentation hardness check), which is a quick procedure suitable for quality control testing.
The methods are applicable only to latex, urethane foam and PVC foam of the open cell type.
NOTE -The indentation hardness of flexible cellular materials is a measure of their load-bearing properties. The methods
1qw5fie.d can be used for &sting finished articles and for the characterization of bulk material.
The results obtained by these methods relate only to the test conditions specified and cannot, in general, be used
directly for design purposes.
2 Normative reference
The following standard contains provisions which, through reference in this text, constitute provisions of this
International Standard. At the time of publication, the edition indicated was valid. All standards are subject to
revision, and parties to agreements based on this International Standard are encouraged to investigate the
possibility of applying the most recent edition of the standard indicated below. Members of IEC and IS0 maintain
registers of currently valid International Standards.
IS0 471 :1995, Rubber - Temperatures, humidities and times for conditioning and testing.
3 Definition
For the purposes of this International Standard, the following definition applies:
31 indentation hardness
The total force, in newtons, required to produce, under specified conditions, a specified indentation of a standard
test piece with a standard apparatus using the test procedure specified below.
4 Principle
The forces required to produce specified indentations under specified conditions are measured.
0 IS0
IS0 2439: 1997(E)
5 Apparatus
5.1 Test machine
The test machine shall be capable of indenting the test piece between a supporting surface and an indentor which
shall have a uniform relative motion, in the vertical direction, of 100 mm/min + 20 mm/min.
The test machine shall have a means of measuring the force required to produce the specified indentation with a
precision of +l % or +l N, whichever is the greater, and of measuring the test piece thickness under load with a
precision of +0,25 mm.
The test machine for method C shall have its force gauge fitted with a tell-tale needle and/or shall be equipped to
make autographic load-indentation plots
The test machine shall also be capable of maintaining the specified degree of indentation with a precision of
+0,25 - mm for the specified period.
5.2 Supporting surface
Unless otherwise specified, the test pieces shall be supported on a smooth, flat, horizontal and rigid surface, larger
than the test piece and suitably vented with holes approximately 6 mm in diameter and of approximately 20 mm
pitch, to allow the escape of air from below the test piece.
5.3 lndentor
The indentor, vented with holes, shall be m
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