ASTM D5682-08
(Test Method)Standard Test Methods for Electrical Resistivity of Liquid Paint and Related Materials
Standard Test Methods for Electrical Resistivity of Liquid Paint and Related Materials
SIGNIFICANCE AND USE
These tests are suitable for testing paints adjusted for compatibility with various electrostatic spray coating applications, and by their use, spray performance can be optimized.
SCOPE
1.1 These test methods cover the determination of specific resistance (resistivity) of liquid paints, solvents, and other fluids in the range of 0.6 to 2640 MΩ-cm.
1.2 Test Method A describes a procedure for making resistance tests with a commonly used paint application test assembly (Fig. 1 and Fig. 2).
1.3 Test Method B describes a procedure for making resistance tests with a conductivity meter (Fig. 3).
1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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Designation: D5682 − 08
StandardTest Methods for
1
Electrical Resistivity of Liquid Paint and Related Materials
This standard is issued under the fixed designation D5682; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope* 3. Summary of Test Methods
1.1 These test methods cover the determination of specific 3.1 Test Methods A and B measure direct current through
resistance (resistivity) of liquid paints, solvents, and other concentric cylinder electrodes immersed in a liquid paint
fluids in the range of 0.6 to 2640 MΩ-cm. specimen.
1.2 Test Method A describes a procedure for making resis-
4. Significance and Use
tance tests with a commonly used paint application test
4.1 These tests are suitable for testing paints adjusted for
assembly (Fig. 1 and Fig. 2).
compatibility with various electrostatic spray coating
1.3 Test Method B describes a procedure for making resis-
applications, and by their use, spray performance can be
tance tests with a conductivity meter (Fig. 3).
optimized.
1.4 The values stated in SI units are to be regarded as
5. Interferences
standard. No other units of measurement are included in this
standard.
5.1 Contamination of the specimen is the most likely cause
1.5 This standard does not purport to address all of the of error. Very small amounts of water, acids, or polar solvents
safety concerns, if any, associated with its use. It is the will lower the resistance of high resistivity solvents and paints.
responsibility of the user of this standard to establish appro-
5.2 High humidity is not known to interfere with the test
priate safety and health practices and determine the applica-
itself but can lead to water pickup by the specimen. For
bility of regulatory limitations prior to use.
repeatable results, tests should be made under the same
atmospheric conditions and specimens should be stored and
2. Terminology
handled so as to keep water pickup to a minimum.
2.1 Definitions:
5.3 Resistivity varies with temperature. A standard test
2.1.1 specific resistance (resistivity), n— the ratio of the d-c
temperature of 25°C is recommended. Other temperatures are
potential gradient in volts per centimetre paralleling the current
possible on agreement between the producer and the user.
flow within the specimen to the current density in amperes per
square centimetre at a given instant of time and under
5.4 Electrification time must be the same for every test due
prescribed conditions.
to ion migrations that cause current flow to decrease with time.
2.1.1.1 Discussion—This is numerically equal to the resis-
Variations with time of electrification can result in appreciable
tancebetweenoppositefacesofacentimetrecubeoftheliquid.
variation in the test results.
The units are ohm centimetres (or megohm centimetres).
5.5 Devices described in Test Methods A and B apply
2.2 Definitions of Terms Specific to This Standard:
differenttestvoltages(45Vand15V,respectively).Becauseof
2.2.1 kilohm (KΩ), n—resistance value equal to 1000 Ω
this, some variation in results may be expected.
3
(10 ).
6. Reagents and Materials
2.2.2 megohm (MΩ), n—resistance value equal to 1 000 000
6
Ω (10 ). 6.1 Low Resistivity Cell Constant Standards (see Appendix
X1 for cell constant determination method).
2.2.3 ohm-centimetre (or megohm-centimetre), n—unit of
2
6.1.1 Potassium Chloride, 1000 µΩ/cm.
specific resistance (resistivity).
6.2 Cleaning Solvents and Solutions—It is essential to
1
These test methods are under the jurisdiction of ASTM Committee D01 on thoroughly clean the probe before and after tests. The cleaning
Paint and Related Coatings, Materials, and Applications and are the direct
solvent should be chosen on the basis of the paint tested. Due
responsibility of Subcommittee D01.24 on Physical Properties of Liquid Paints and
care must be exercised in cleaning to ensure all cleaning
Paint Materials.
CurrenteditionapprovedJune1,2008.PublishedJuly2008.Originallyapproved
in 1995. Last previous edition approved in 2002 as D5682 - 95 (2002). DOI:
2
10.1520/D5682-08. 1000 µΩ/cm test solutions are available from scientific supply companies.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
D5682 − 08
FIG. 1 Analog Paint Application Test Assembly
FIG. 3 Conductivity Meter
8. Standardization
8.1 For maximum accuracy, the probe should be standard-
ized to determine the exact cell constant. For routine measure-
ments a cell constant (K) of 132 m
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation:D5682–95(Reapproved2002) Designation:D5682–08
Standard Test Methods for
1
Electrical Resistivity of Liquid Paint and Related Materials
This standard is issued under the fixed designation D 5682; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope*
1.1 These test methods cover the determination of specific resistance (resistivity) of liquid paints, solvents, and other fluids in
the range of 0.6 to 2640 MV-cm.
1.2 Test MethodAdescribes a procedure for making resistance tests with a commonly used paint application test assembly (Fig.
1).
1.3Test Method B describes a procedure for making resistance tests with a conductivity meter (and Fig. 2).
1.4
1.3 Test Method B describes a procedure for making resistance tests with a conductivity meter (Fig. 3).
1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory
limitations prior to use.
2. Terminology
2.1 Definitions:
2.1.1 specific resistance (resistivity), n—The — the ratio of the d-c potential gradient in volts per centimetere paralleling the
current flow within the specimen to the current density in amperes per square centimetere at a given instant of time and under
prescribed conditions.
2.1.1.1 Discussion—This is numerically equal to the resistance between opposite faces of a centimetere cube of the liquid. The
units are ohm centimeteres (or megohm centimeteres).
2.2 Definitions of Terms Specific to This Standard:
3
2.2.1 kilohms (KV)kilohm (KV), n—resistance value equal to 1000 V (10 ).
6
2.2.2 megohms (MV)megohm (MV), n—resistance value equal to 1 000 000 V (10 ).
2.2.3 ohm-centimeters (or megohm-centimeters)ohm-centimetre (or megohm-centimetre), n—unit of specific resistance
(resistivity).
3. Summary of Test Methods
3.1 Test Methods A and B measure direct current through concentric cylinder electrodes immersed in a liquid paint specimen.
4. Significance and Use
4.1 Thesetestsaresuitablefortestingpaintsadjustedforcompatibilitywithvariouselectrostaticspraycoatingapplications,and
by their use, spray performance can be optimized.
5. Interferences
5.1 Contamination of the specimen is the most likely cause of error. Very small amounts of water, acids, or polar solvents will
lower the resistance of high resistivity solvents and paints.
5.2 High humidity is not known to interfere with the test itself but can lead to water pickup by the specimen. For repeatable
results, tests should be made under the same atmospheric conditions and specimens should be stored and handled so as to keep
water pickup to a minimum.
5.3 Resistivity varies with temperature. A standard test temperature of 25°C is recommended. Other temperatures are possible
1
These test methods are under the jurisdiction of ASTM Committee D01 on Paint and Related Coatings, Materials, and Applications and is the direct responsibility of
Subcommittee D01.24 on Physical Properties of Liquid Paints and Paint Materials.
Current edition approved March 15, 1995. Published May 1995.
1
These test methods are under the jurisdiction of ASTM Committee D01 on Paint and Related Coatings, Materials, and Applications and are the direct responsibility of
Subcommittee D01.24 on Physical Properties of Liquid Paints & Paint Materials.
Current edition approved June 1, 2008. Published July 2008. Originally approved in 1995. Last previous edition approved in 2002 as D 5682 - 95 (2002).
*A Summary of Changes section appears at the end of this standard.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1
---------------------- Page: 1 ----------------------
D5682–08
FIG. 1 Analog Paint Application Test Assembly
FIG. 2 Diagram of Digital Application Test Assembly
on agreement between the producer and the user.
5.4 Electrification time must be the same for every test due to ion migrations that cause current flow to decrease with time.
Variations with time of electrification can result in appreciable variation in the test results.
5.5Equipment outlined5.5
...
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