ASTM D5162-21

Standard Practice for Discontinuity (Holiday) Testing of Nonconductive Protective Coating on Metallic Substrates

SIGNIFICANCE AND USE
4.1 A coating/lining is applied to a metallic substrate to prevent corrosion or reduce product contamination, or both. The degree of coating continuity required is dictated by service conditions. Discontinuities in a coating/lining are frequently very minute and may not be readily visible. This practice provides a procedure for electrical detection of discontinuities in nonconductive coating systems.  
4.2 Electrical testing to determine the presence and number of discontinuities in a coating/lining is performed on a nonconductive coating/lining applied to an electrically conductive surface. The allowable number of discontinuities should be determined prior to conducting this test since the acceptable quantity of discontinuities will vary depending on film thickness, design, and service conditions.  
4.3 The low voltage wet sponge test equipment is generally used for detecting discontinuities in coatings/linings having a total thickness of 0.5 mm (20 mil) or less. High voltage spark test equipment is generally used for detecting discontinuities in coatings/linings having a total thickness of greater than 0.5 mm (20 mil).  
4.3.1 Coatings/linings less than 0.5 mm (20 mil) in thickness may be susceptible to damage if tested with high voltage spark testing equipment. However, coatings/linings greater than 0.25 mm (10 mil) and less than 0.5 mm (20 mil) may be tested with high voltage spark test equipment provided the voltage is calculated and set correctly, and the coating manufacturer approves its use.  
4.4 To prevent damage to a coating film when using high voltage test instrumentation, total film thickness and dielectric strength in a coating system shall be considered in determining the appropriate voltage for detection of discontinuities. Atmospheric conditions shall also be considered since the voltage required for the spark to gap a given distance in air varies with the conductivity of the air at the time the test is conducted. Table X1.1 in Appendix X1 cont...
SCOPE
1.1 This practice covers procedures for determining discontinuities using two types of test equipment:  
1.1.1 Test Method A—Low Voltage Wet Sponge, and  
1.1.2 Test Method B—High Voltage Spark Testers.  
1.2 This practice addresses metallic substrates. For concrete surfaces, refer to Practice D4787.  
1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.  
1.4 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

• Status: Published
• Publication Date: 31-Oct-2021
• ICS: 25.220.20 - Surface treatment
• Technical Committee: D01 - Paint and Related Coatings, Materials, and Applications
• Drafting Committee: D01.46 - Industrial Protective Coatings

Standards Content (Sample)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: D5162 − 21
Standard Practice for
Discontinuity (Holiday) Testing of Nonconductive Protective
1
Coating on Metallic Substrates
This standard is issued under the fixed designation D5162; 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. Terminology
3.1 Definitions of Terms Specific to This Standard:
1.1 This practice covers procedures for determining discon-
3.1.1 discontinuity, as used in this standard, n—a flaw, void,
tinuities using two types of test equipment:
crack, thin spot, foreign inclusion, or contamination in the
1.1.1 Test Method A—Low Voltage Wet Sponge, and
coating film that significantly lowers the dielectric strength of
1.1.2 Test Method B—High Voltage Spark Testers.
the coating film; a discontinuity may also be identified as a
1.2 This practice addresses metallic substrates. For concrete
holiday or pinhole.
surfaces, refer to Practice D4787.
3.1.2 holiday, as used in this standard, n—a term that
1.3 The values stated in SI units are to be regarded as the
identifies a discontinuity.
standard. The values given in parentheses are for information
3.1.3 holiday detector, as used in this standard, n—a device
only.
that locates discontinuities in a nonconductive coating film
applied to an electrically conductive surface.
1.4 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
3.1.4 pinhole, as used in this standard, n—a film defect
responsibility of the user of this standard to establish appro-
characterized by small pore like flaws in the coating which,
priate safety, health, and environmental practices and deter-
when extended entirely through the film, will appear as a
mine the applicability of regulatory limitations prior to use.
discontinuity; a pinhole in the finish coat may not appear as a
1.5 This international standard was developed in accor-
discontinuity.
dance with internationally recognized principles on standard-
4. Significance and Use
ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom-
4.1 A coating/lining is applied to a metallic substrate to
mendations issued by the World Trade Organization Technical
prevent corrosion or reduce product contamination, or both.
Barriers to Trade (TBT) Committee.
The degree of coating continuity required is dictated by service
conditions. Discontinuities in a coating/lining are frequently
2. Referenced Documents
very minute and may not be readily visible. This practice
2
provides a procedure for electrical detection of discontinuities
2.1 ASTM Standards:
in nonconductive coating systems.
D4787 Practice for Continuity Verification of Liquid or
Sheet Linings Applied to Concrete Substrates
4.2 Electrical testing to determine the presence and number
D7091 Practice for Nondestructive Measurement of Dry
of discontinuities in a coating/lining is performed on a non-
Film Thickness of Nonmagnetic Coatings Applied to
conductive coating/lining applied to an electrically conductive
Ferrous Metals and Nonmagnetic, Nonconductive Coat-
surface. The allowable number of discontinuities should be
ings Applied to Non-Ferrous Metals
determined prior to conducting this test since the acceptable
quantity of discontinuities will vary depending on film
thickness, design, and service conditions.
1
This practice is under the jurisdiction of ASTM Committee D01 on Paint and
4.3 The low voltage wet sponge test equipment is generally
Related Coatings, Materials, and Applications and is the direct responsibility of
used for detecting discontinuities in coatings/linings having a
Subcommittee D01.46 on Industrial Protective Coatings.
total thickness of 0.5 mm (20 mil) or less. High voltage spark
Current edition approved Nov. 1, 2021. Published November 2021. Originally
test equipment is generally used for detecting discontinuities in
approved in 1991. Last previous edition approved in 2015 as D5162 – 15. DOI:
10.1520/D5162-21.
coatings/liningshavingatotalthicknessofgreaterthan0.5mm
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
(20 mil).
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
4.3.1 Coatings/linings less than 0.5 mm (20 mil) in thick-
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. ness may be susceptible to damage if tested with high voltage
Copyright © ASTM International, 100 Barr
...

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: D5162 − 15 D5162 − 21
Standard Practice for
Discontinuity (Holiday) Testing of Nonconductive Protective
1
Coating on Metallic Substrates
This standard is issued under the fixed designation D5162; 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 This practice covers procedures for determining discontinuities using two types of test equipment:
1.1.1 Test Method A—Low Voltage Wet Sponge, and
1.1.2 Test Method B—High Voltage Spark Testers.
1.2 This practice addresses metallic substrates. For concrete surfaces, refer to Practice D4787.
1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.4 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 safety, health, and healthenvironmental practices and determine the
applicability of regulatory limitations prior to use.
1.5 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2
2.1 ASTM Standards:
G62 Test Methods for Holiday Detection in Pipeline Coatings
D4787 Practice for Continuity Verification of Liquid or Sheet Linings Applied to Concrete Substrates
D7091 Practice for Nondestructive Measurement of Dry Film Thickness of Nonmagnetic Coatings Applied to Ferrous Metals
and Nonmagnetic, Nonconductive Coatings Applied to Non-Ferrous Metals
3
2.2 NACE Standard Practices:
SP0188–2006 Discontinuity (Holiday) Testing of Protective Coatings
SP0274–2011 High Voltage Electrical Inspection of Pipeline Coatings
SP0490–2007 Holiday Detection of Fusion Bonded Epoxy
4
2.3 ISO Standard:
ISO 29601 Paints and varnishes. Corrosion protection by protective paint systems. Assessment of porosity in a dry film
1
This practice is under the jurisdiction of ASTM Committee D01 on Paint and Related Coatings, Materials, and Applications and is the direct responsibility of
Subcommittee D01.46 on Industrial Protective Coatings.
Current edition approved Dec. 1, 2015Nov. 1, 2021. Published December 2015November 2021. Originally approved in 1991. Last previous edition approved in 20082015
as D5162 – 08.D5162 – 15. DOI: 10.1520/D5162-15.10.1520/D5162-21.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

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D5162 − 21
3. Terminology
3.1 Definitions of Terms Specific to This Standard:
3.1.1 discontinuity, as used in this standard, n—a flaw, void, crack, thin spot, foreign inclusion, or contamination in the coating
film that significantly lowers the dielectric strength of the coating film. Afilm; a discontinuity may also be identified as a holiday
or pinhole.
3.1.2 holiday, as used in this standard, n—a term that identifies a discontinuity.
3.1.3 holiday detector, as used in this standard, n—a device that locates discontinuities in a nonconductive coating film applied
to an electrically conductive surface.
3.1.4 pinhole, as used in this standard, n—a film defect characterized by small pore like flaws in the coating which, when extended
entirely through the film, will appear as a discontinuity. Adiscontinuity; a pinhole in the finish coat may not appear as a
discontinuity.
4. Significance and Use
4.1 A coatingcoating/lining is applied to a metallic substrate to prevent corrosion, reduce abrasion corrosion or reduce product
contamination, or all three. both. The degree of coating continuity required is dictated by service conditions. Discontinuities in a
coatingcoating/lining are frequently very minute and may not be readily visible. This practice provides a procedure for electrical
detection of minute discontinuities in nonconductive coating systems.
4.2 Electr
...