ASTM D5162-15

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

SIGNIFICANCE AND USE
4.1 A coating is applied to a metallic substrate to prevent corrosion, reduce abrasion or reduce product contamination, or all three. The degree of coating continuity required is dictated by service conditions. Discontinuities in a coating are frequently very minute and not readily visible. This practice provides a procedure for electrical detection of minute discontinuities in nonconductive coating systems.  
4.2 Electrical testing to determine the presence and number of discontinuities in a coating film is performed on a nonconductive coating 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 coating film thickness, design, and service conditions.  
4.3 The low voltage wet sponge test equipment is generally used for determining the existence of discontinuities in coating films having a total thickness of 0.5 mm (20 mil) or less. High voltage spark test equipment is generally used for determining the existences of discontinuities in coating films having a total thickness of greater than 0.5 mm (20 mil).  
4.4 Coatings that are applied at a thickness of less than 0.5 mm (20 mil) may be susceptible to damage if tested with high voltage spark testing equipment. Consult the coating manufacturer for proper test equipment and inspection voltages.  
4.5 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 selecting 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. Suggested starting voltages are provided in Table 1.  
Note 1: Alternative methods for selecting a suitable test voltage are given in T...
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 and health practices and determine the applicability of regulatory limitations prior to use.

General Information

• Status: Historical
• Publication Date: 30-Nov-2015
• 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)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: D5162 − 15
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.
4
1. Scope 2.3 ISO Standard:
ISO 29601 Paints and varnishes. Corrosion protection by
1.1 This practice covers procedures for determining discon-
protective paint systems. Assessment of porosity in a dry
tinuities using two types of test equipment:
film
1.1.1 Test Method A—Low Voltage Wet Sponge, and
3. Terminology
1.1.2 Test Method B—High Voltage Spark Testers.
3.1 Definitions of Terms Specific to This Standard:
1.2 This practice addresses metallic substrates. For concrete
3.1.1 discontinuity, as used in this standard, n—a flaw, void,
surfaces, refer to Practice D4787.
crack, thin spot, foreign inclusion, or contamination in the
1.3 The values stated in SI units are to be regarded as the
coating film that significantly lowers the dielectric strength of
standard. The values given in parentheses are for information
the coating film. A discontinuity may also be identified as a
only.
holiday or pinhole.
1.4 This standard does not purport to address all of the
3.1.2 holiday, as used in this standard, n—a term that
safety concerns, if any, associated with its use. It is the
identifies a discontinuity.
responsibility of the user of this standard to establish appro-
3.1.3 holiday detector, as used in this standard, n—a device
priate safety and health practices and determine the applica-
that locates discontinuities in a nonconductive coating film
bility of regulatory limitations prior to use.
applied to an electrically conductive surface.
3.1.4 pinhole, as used in this standard, n—a film defect
2. Referenced Documents
characterized by small pore like flaws in the coating which,
2
2.1 ASTM Standards:
when extended entirely through the film, will appear as a
G62 Test Methods for Holiday Detection in Pipeline Coat-
discontinuity. A pinhole in the finish coat may not appear as a
ings
discontinuity.
D4787 Practice for Continuity Verification of Liquid or
4. Significance and Use
Sheet Linings Applied to Concrete Substrates
3
4.1 A coating is applied to a metallic substrate to prevent
2.2 NACE Standard Practices:
corrosion, reduce abrasion or reduce product contamination, or
SP0188–2006 Discontinuity (Holiday) Testing of Protective
all three. The degree of coating continuity required is dictated
Coatings
by service conditions. Discontinuities in a coating are fre-
SP0274–2011 High Voltage Electrical Inspection of Pipeline
quently very minute and not readily visible. This practice
Coatings
provides a procedure for electrical detection of minute discon-
SP0490–2007 Holiday Detection of Fusion Bonded Epoxy
tinuities in nonconductive coating systems.
4.2 Electrical testing to determine the presence and number
1 of discontinuities in a coating film is performed on a noncon-
This practice is under the jurisdiction of ASTM Committee D01 on Paint and
Related Coatings, Materials, and Applications and is the direct responsibility of
ductive coating applied to an electrically conductive surface.
Subcommittee D01.46 on Industrial Protective Coatings.
The allowable number of discontinuities should be determined
Current edition approved Dec. 1, 2015. Published December 2015. Originally
prior to conducting this test since the acceptable quantity of
approved in 1991. Last previous edition approved in 2008 as D5162 – 08. DOI:
discontinuities will vary depending on coating film thickness,
10.1520/D5162-15.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
design, and service conditions.
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
4
the ASTM website. Available from International Organization for Standardization (ISO), ISO
3
Available from NACE International (NACE), 1440 South Creek Dr., Houston, Central Secretariat, BIBC II, Chemin de Blandonnet 8, CP 401, 1214 Vernier,
TX 77084-4906, http://www.nace.org. Geneva, Switzerland, http://www.iso.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
D5162 − 15
TABLE 1 Suggested Voltages for High Voltage Spark Testing
4.3 The low voltage wet sponge test equipment is generally
used for determining the existence of discontinuities in coating Total Dry Film Thickness
Suggested
Inspection, V
films having a total t
...

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 − 08 D5162 − 15
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 and health practices and determine the applicability of regulatory
limitations prior to use.
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
3
2.2 NACE Standard:Standard Practices:
RP0188–88SP0188–2006 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
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. 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. A pinhole in the finish coat may not appear as a discontinuity.
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 June 1, 2008Dec. 1, 2015. Published July 2008December 2015. Originally approved in 1991. Last previous edition approved in 20012008 as
D5162 – 01.D5162 – 08. DOI: 10.1520/D5162-08.10.1520/D5162-15.
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’sstandard’s Document Summary page on the ASTM website.
3
Available from NACE International (NACE), 1440 South Creek Dr., Houston, TX 77084-4906, http://www.nace.org.
4
Available from International Organization for Standardization (ISO), ISO Central Secretariat, BIBC II, Chemin de Blandonnet 8, CP 401, 1214 Vernier, Geneva,
Switzerland, http://www.iso.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
D5162 − 15
4. Significance and Use
4.1 A coating is applied to a metallic substrate to prevent corrosion, reduce abrasion or reduce product contamination, or all
three. The degree of coating continuity required is dictated by service conditions. Discontinuities in a coating are frequently very
minute and not readily visible. This practice provides a procedure for electrical detection of minute discontinuities in
nonconductive coating systems.
4.2 Electrical testing to determine the presence and number of discontinuities in a coating film is performed on a nonconductive
coating applied to an electrically conductive surface. The allowable number of discontinuities should be determined prior to
conducting this test since the acceptable q
...