Rubber, vulcanized or thermoplastic — Determination of insulation resistance

Caoutchouc vulcanisé ou thermoplastique — Détermination de la résistance d'isolement

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ISO 2951:2012 - Rubber, vulcanized or thermoplastic -- Determination of insulation resistance
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Second edition
Rubber, vulcanized or thermoplastic —
Determination of insulation resistance
Caoutchouc vulcanisé ou thermoplastique — Détermination de la
résistance d’isolement
Reference number
ISO 2951:2012(E)
ISO 2012

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ISO 2951:2012(E)
© ISO 2012
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 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. + 41 22 749 01 11
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ii © ISO 2012 – All rights reserved

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ISO 2951:2012(E)
Contents Page
Foreword .iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Test equipment . 1
5 Electrodes . 1
5.1 General . 1
5.2 Conducting-paint electrodes (for flat plates, tubes and rods) . 2
5.3 Bar electrodes (for thin sheets and tapes) . 2
6 Test pieces . 2
6.1 Test pieces for conducting-paint electrodes . 2
6.2 Test pieces for bar electrodes . 2
6.3 Attachment of electrodes . 2
6.4 Conditioning . 2
6.5 Number of test pieces . 2
7 Procedure . 3
8 Expression of results . 3
8.1 Test pieces using conducting-paint electrodes . 3
8.2 Test pieces using bar electrodes . 3
9 Test report . 3
Annex A (informative) Cleaning and mounting of test pieces . 7
Bibliography . 8
© ISO 2012 – All rights reserved iii

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ISO 2951:2012(E)
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 (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
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.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 2951 was prepared by Technical Committee ISO/TC 45, Rubber and rubber products, Subcommittee
SC 2, Testing and analysis.
This second edition cancels and replaces the first edition (ISO 2951:1974), which has been technically
revised as follows:
— the title and scope have been modified to include thermoplastic rubbers;
— the normative references have been updated;
— the instructions in old subclause 6.2 (now 5.3) concerning rigid materials have been deleted;
— the number of test pieces tested is now “more than three” (see 6.5), as opposed to “three” in the previous edition;
— the test report has been updated.
iv © ISO 2012 – All rights reserved

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ISO 2951:2012(E)
This International Standard specifies an empirical method that gives a value for insulation resistance which
includes, without discrimination, both volume and surface resistance. This value can be used for the comparison
of the quality of different insulating rubbers. For general principles regarding measuring resistance, general
effects of temperature and humidity, applied voltage and time of electrification, see IEC 60093 and IEC 60167 .
© ISO 2012 – All rights reserved v

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Rubber, vulcanized or thermoplastic — Determination of
insulation resistance
1 Scope
This International Standard specifies a method for the determination of the insulation resistance of vulcanized
and thermoplastic rubbers without discrimination between the volume and surface resistances involved. This
method should only be used for test pieces with a resistance greater than 10 Ω.
NOTE Methods of test for test pieces with a lower resistance are described in ISO 1853 and ISO 2878.
Because the test pieces are simply and easily prepared, this method is particularly useful for rapidly determining
values which will give a general indication of quality when great accuracy is not required.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced document
(including any amendments) applies.
IEC 60093, Methods of test for volume resistivity and surface resistivity of solid electrical insulating materials
3 Terms and definitions
For the purp

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