EN ISO 15091:2012

SLOVENSKI STANDARD
01-julij-2013
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Paints and varnishes - Determination of electrical conductivity and resistance (ISO
15091:2012)
Beschichtungsstoffe - Bestimmung der elektrischen Leitfähigkeit und des elektrischen
Widerstandes (ISO 15091:2012)
Peintures et vernis - Détermination de la conductivité et de la résistance électriques (ISO
15091:2012)
Ta slovenski standard je istoveten z: EN ISO 15091:2012
ICS:
87.040 Barve in laki Paints and varnishes
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 15091
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2012
ICS 87.040
English Version
Paints and varnishes - Determination of electrical conductivity
and resistance (ISO 15091:2012)
Peintures et vernis - Détermination de la conductivité et de Beschichtungsstoffe - Bestimmung der elektrischen
la résistance électriques (ISO 15091:2012) Leitfähigkeit und des elektrischen Widerstandes (ISO
15091:2012)
This European Standard was approved by CEN on 17 November 2012.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same
status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United
Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2012 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 15091:2012: E
worldwide for CEN national Members.

Contents Page
Foreword .3

Foreword
This document (EN ISO 15091:2012) has been prepared by Technical Committee ISO/TC 35 “Paints and
varnishes” in collaboration with Technical Committee CEN/TC 139 “Paints and varnishes” the secretariat of
which is held by DIN.
This European Standard shall be given the status of a national standard, either by publication of an identical
text or by endorsement, at the latest by June 2013, and conflicting national standards shall be withdrawn at
the latest by June 2013.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
According to the CEN/CENELEC Internal Regulations, the national standards organisations of the following
countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech
Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece,
Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.
Endorsement notice
The text of ISO 15091:2012 has been approved by CEN as a EN ISO 15091:2012 without any modification.

INTERNATIONAL ISO
STANDARD 15091
First edition
2012-12-01
Paints and varnishes — Determination of
electrical conductivity and resistance
Peintures et vernis — Détermination de la conductivité et de la
résistance électriques
Reference number
ISO 15091:2012(E)
©
ISO 2012
ISO 15091:2012(E)
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.
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Tel. + 41 22 749 01 11
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E-mail copyright@iso.org
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Published in Switzerland
ii © ISO 2012 – All rights reserved

ISO 15091:2012(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 General . 3
4.1 Measurement of the resistance . 3
4.2 Avoidance of electrolysis and polarization effects . 4
5 Apparatus . 5
5.1 Measuring instrument . 5
5.2 Measuring cell . 5
6 Sampling . 5
7 Procedure . 5
7.1 Test conditions . 5
7.2 Viscosity of test sample . 6
7.3 Number of determinations . 6
7.4 Measurement of the electrical resistance or the electrical conductivity . 6
8 Expression of results . 6
9 Precision . 6
10 Test report . 7
Annex A (normative) Calibration . 8
Annex B (informative) Dependence of the conductivity on the measurement temperature .10
Bibliography . 11
ISO 15091:2012(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 (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 15091 was prepared by Technical Committee ISO/TC 35, Paints and varnishes, Subcommittee SC 9,
General test methods for paints and varnishes.
iv © ISO 2012 – All rights reserved

INTERNATIONAL STANDARD ISO 15091:2012(E)
Paints and varnishes — Determination of electrical conductivity
and resistance
1 Scope
This International Standard specifies a method for determining the electrical conductivity and the electrical
resistance of coating materials. The conductivity is usually measured for water-borne paints and varnishes,
including electrodeposition coating materials, and the resistance is usually measured for solvent-borne paints
and varnishes. If required, the resistivity of the coating material is calculated from either of these measurements.
The method is applicable to products having a conductivity less than 5 µS/cm, corresponding to a resistivity
greater than 200 kΩ⋅cm.
The conductivity of coating materials influences their processibility in the presence of an electric field. This is
particularly important for electrodeposition paints and coating materials which are processed electrostatically.
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.
ISO 1513, Paints and varnishes — Examination and preparation of test samples
ISO 3696, Water for analytical laboratory use — Specification and test methods
ISO 15528, Paints, varnishes and raw materials for paints and varnishes — Sampling
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
electrical resistance
R
ratio of the potential difference along a conductor and the current through the conductor
NOTE Resistance is given by Ohm’s law:
U
R = (1)
I
where
U is the potential difference;
I is the current.
The unit of electrical resistance is the ohm (Ω), given by:
1volt
1ohm =
1ampere
The electrical resistance depends on the material of the conductor, its dimensions (length and cross-section) and its temperature.
ISO 15091:2012(E)
3.2
resistivity
ρ
resistance per unit length of a material of unit cross-sectional area
NOTE Resistivity is given by Equation (2):
A
ρ =×R (2)
l
where
A is the cross-sectional area of the conductor;
l is the length of the conductor.
The unit of resistivity is the ohm metre (Ω⋅m).
3.3
conductance
G
reciprocal of the resistance
NOTE Conductance is given by Equation (3):
1 I
G == (3)
R U
The unit of conductance is the siemens (S):
11ampere
1S ==
ohm 1volt
3.4
electrical conductivity
γ
reciprocal of the resistivity
NOTE Electrical conductivity is given by Equation (4):
11 l
γ == × (4)
ρ R A
–1
The unit of electrical conductivity is the siemens reciprocal metre (S⋅m ).
3.5
cell constant
c
quotient of the length and the cross-sectional area of a conductor
NOTE It is given by Equation (5):
l
c = (5)
A
From Equation (2), it can be seen that it corresponds to the ratio of the resistance to the resistivity of the conductor material.
For the determination of the resistivity by resistance measurement, this geometrical factor, i.e. the cell constant of the
measurement assembly, will need to be known.
–1
Cell constants are given in reciprocal centimetres (cm ).
2 © ISO 2012 – All rights reserved

ISO 15091:2012(E)
4 General
4.1 Measurement of the resistance
The resistance may be determined by
— measurement of the current through a sample and the voltage acting on the sample;
or
— comparison of the measured resistance with a reference resistance.
For the current/voltage measurement, usually a constant pre-determined voltage is applied to the sample,
and the current is measured with a suitable measuring instrument (e.g. a moving-coil instrument or a digital
instrument). The resistance is then calculated from Equation (1). See Figure
...