ISO 14309:2019

ISO 14309:2019(E)
INTERNATIONAL STANDARD
Deleted: /FDIS
ISO
14309
Second edition
2019‐07

Rubber, vulcanized or thermoplastic — Determination of
volume and/or surface resistivity
Caoutchouc vulcanisé ou thermoplastique — Détermination de la résistivité transversale et/ou
superficielle
© ISO 2019 – All rights reserved i

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ISO 14309:2019(E)
Foreword
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standards bodies (ISO member bodies). The work of preparing International Standards is normally
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matters of electrotechnical standardization.
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described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
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on the ISO list of patent declarations received (see www.iso.org/patents).
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URL: www.iso.org/iso/foreword.html.
This document 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 14309:2011), which has been technically
revised.
The main changes compared to the previous edition are as follows:
— A detailed explanation on the requirement for the electrode gap for volume resistivity has been
added in 5.4.2.
— The typical dimension for D2 has been changed to (60 ± 0,5) mm in 5.4.2.
— To calculate the volume resistivity, the effective area of the main electrode is now derived from
D + B in 11.1, and the information on B has been newly included as Annex D.
1 g g
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
ii © ISO 2019 – All rights reserved

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ISO 14309:2019(E)
Introduction
Rubber materials are widely used in many industries, either as the major material or forming a part of
the product, because of their unique physical properties which can be tailored by compounding to
match the particular requirements of the product specification. Although rubbers are generally
regarded as insulating materials, they can be made electrically conductive or dissipative by
compounding with a certain amount of carbon black or ionizable ingredients. Hence, the range of
electrical resistance to be measured is very wide. It is difficult, however, to obtain high accuracy for
measurements in the high‐resistance range due to a number of factors.
In this document, the guarded‐electrode system is used to determine the resistivity of rubber test
pieces since it is considered a good compromise between minimizing the errors by shunting away stray
currents and using more unwieldy measurement instruments (see also IEC 62631‐3‐1).
ISO 1853, on the other hand, covers rubber materials with medium to low resistance, i.e. resistivities of
8
10 Ω⋅m or below. It specifies three methods for determining volume resistivity which minimize or
eliminate contact resistance.
The methods specified in this document were originally designed for the determination of both surface
and volume resistivity of insulating rubber materials, but their use can be extended to cover the range
from high to low resistivity.
It is known that the test results are sensitive to the test conditions, such as temperature and humidity,
and to heat and strain history.
© ISO 2019 – All rights reserved iii

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ISO 14309:2019(E)
Rubber, vulcanized o
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