ASTM D6762-02a(2017)

Standard Test Method for Determining the Hiding Power of Paint by Visual Evaluation of Spray Applied Coatings

SIGNIFICANCE AND USE
5.1 This test method determines hiding power of a test paint by visual evaluation of a spray applied coating.
Note 1: Test Method D2805 describes an instrumental method for determining hiding power. The paint film is applied at a uniform thickness (for example with a doctor blade), the film thickness is measured rigorously, and the opacity is determined photometrically. Hiding power is thereby determined with a high degree of precision.  
5.2 Test Method D6762 is less precise than Test Method D2805, but is commonly used since it is more closely related to the application characteristics of the paint and is simpler in concept and evaluation.
SCOPE
1.1 This test method provides for the quantitative visual determination of the film thickness required to achieve full hiding. This film thickness is considered to be the hiding power of a test paint.  
1.2 This method applies only to spray applied coatings but its concepts are valid for other methods of application as well.  
1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.  
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: Historical
• Publication Date: 30-Nov-2017
• ICS: 87.040 - Paints and varnishes
• Technical Committee: D01 - Paint and Related Coatings, Materials, and Applications
• Drafting Committee: D01.26 - Optical Properties

Relations

• Replaces: ASTM D6762-02a(2009)e1 - Standard Test Method for Determining the Hiding Power of Paint by Visual Evaluation of Spray Applied Coatings
• Effective Date: 01-Dec-2017
• Referred By: ASTM D7489-09(2017) - Standard Practice for Evaluating Touch-Up Properties of Architectural Coatings under Various Environmental Conditions
• Effective Date: 01-Dec-2017

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: D6762 − 02a (Reapproved 2017)
Standard Test Method for
Determining the Hiding Power of Paint by Visual Evaluation
of Spray Applied Coatings
This standard is issued under the fixed designation D6762; 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 D1186 Test Methods for Nondestructive Measurement of
Dry Film Thickness of Nonmagnetic Coatings Applied to
1.1 This test method provides for the quantitative visual
a Ferrous Base (Withdrawn 2006)
determination of the film thickness required to achieve full
D1400 TestMethodforNondestructiveMeasurementofDry
hiding.Thisfilmthicknessisconsideredtobethehidingpower
Film Thickness of Nonconductive Coatings Applied to a
of a test paint.
Nonferrous Metal Base (Withdrawn 2006)
1.2 This method applies only to spray applied coatings but
D1729 Practice for Visual Appraisal of Colors and Color
its concepts are valid for other methods of application as well.
Differences of Diffusely-Illuminated Opaque Materials
1.3 The values stated in inch-pound units are to be regarded D1730 Practices for Preparation of Aluminum and
Aluminum-Alloy Surfaces for Painting
as standard. The values given in parentheses are mathematical
conversions to SI units that are provided for information only D2805 Test Method for Hiding Power of Paints by Reflec-
tometry
and are not considered standard.
E691 Practice for Conducting an Interlaboratory Study to
1.4 This standard does not purport to address all of the
Determine the Precision of a Test Method
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
3. Terminology
priate safety, health, and environmental practices and deter-
3.1 Definitions—For definitions of terms used in this test
mine the applicability of regulatory limitations prior to use.
method, refer to Terminology D16 and the Paint/Coatings
1.5 This international standard was developed in accor-
Dictionary.
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the
4. Summary of Test Method
Development of International Standards, Guides and Recom-
4.1 The test paint is applied by means of spray application
mendations issued by the World Trade Organization Technical
in a wedge-shaped film over a black and white, black and gray
Barriers to Trade (TBT) Committee.
or red and gray pattern so that a thickness variation is obtained,
2. Referenced Documents
which provides excess hiding at one end of the pattern and
partial hiding at the other end of the pattern.
2.1 ASTM Standards:
D16 TerminologyforPaint,RelatedCoatings,Materials,and
4.2 The dry film is examined under standard illumination to
Applications
select the point where the pattern just becomes obscured. The
D609 Practice for Preparation of Cold-Rolled Steel Panels
thickness of the film at this point is designated the hiding
for Testing Paint, Varnish, Conversion Coatings, and
power of the paint.
Related Coating Products
5. Significance and Use
D1005 Test Method for Measurement of Dry-Film Thick-
ness of Organic Coatings Using Micrometers
5.1 This test method determines hiding power of a test paint
by visual evaluation of a spray applied coating.
NOTE 1—Test Method D2805 describes an instrumental method for
This test method is under the jurisdiction of ASTM Committee D01 on Paint
determining hiding power.The paint film is applied at a uniform thickness
and Related Coatings, Materials, andApplications and is the direct responsibility of
(for example with a doctor blade), the film thickness is measured
Subcommittee D01.26 on Optical Properties.
rigorously,andtheopacityisdeterminedphotometrically.Hidingpoweris
Current edition approved Dec. 1, 2017. Published December 2017. Originally
ɛ
approved in 2002. Last previous edition approved in 2009 as D6762 – 02a (2009) .
DOI: 10.1520/D6762-02AR17.
2 3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or The last approved version of this historical standard is referenced on
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM www.astm.org.
Standards volume information, refer to the standard’s Document Summary page on Published by the Federation of Societies for Coatings Technology, 492
the ASTM website. Norristown Rd., Blue Bell, PA 19422.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D6762 − 02a (2017)
thereby determined with a high degree of precision.
5.2 Test Method D6762 is less precise than Test Method
D2805, but is commonly used since it is more closely related
to the application characteristics of the paint and is simpler in
concept and evaluation.
6. Apparatus
6.1 Test Surface, a smooth-surfaced paper chart, approxi-
mately2by11in.,withatestpatternhavingadjacentblackand
white, black and gray or red and gray areas and coated with a
suitable varnish or lacquer so as to render the surface imper-
vious to paint liquids.
NOTE 2—The red, gray, white and black areas should fall in the
following colorimetric range:
A A
CIE-Y % C h
Red 4–7 10–18 26–38
Gray 28–34
White 80–83
Black 1 max
A 10 2
Valid for Illuminant D65 or C , with 0°/45° geometry.
6.2 Illumination, a light source providing diffuse light of
FIG. 1 Test Panel
reasonable intensity, preferably northern sky light or an ap-
proximation of the same (see Practice D1729).
6.3 Backer Panel, 4 by 12 in. steel or aluminum panel. A 8. Preparation of Wedge-shaped Paint Film (Automatic
Spray Machine)
larger panel may be used if desired.
6.4 Film Thickness Measuring Device, a film thickness 8.1 Prepare the backer panel in accordance with Practices
D609 or D1730.
measuring device in accordance with Test Methods D1005,
D1186, and D1400.
8.2 Attach the desired test pattern to the one side of the
backer panel with masking tape or adhesive tape.
6.5 Spray Equipment, either a hand spray gun or an auto-
matic spray machine.
8.3 Reduce the material being tested to spray viscosity.
6.6 Oven, capable of maintaining the bake schedule for the
8.4 Position the backer panel on the panel holder so that the
product being evaluated.
long side is horizontal or vertical depending on the type of
spray machine being used.
6.7 Tape, masking or adhesive.
8.5 Prepare a wedge-shaped film. An example of a proce-
7. Preparation of Wedge-shaped Paint Film (Hand
dure for prepari
...

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.
´1
Designation: D6762 − 02a (Reapproved 2009) D6762 − 02a (Reapproved 2017)
Standard Test Method for
Determining the Hiding Power of Paint by Visual Evaluation
of Spray Applied Coatings
This standard is issued under the fixed designation D6762; 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.
ε NOTE—Units statement in 1.3 was added editorially in July 2009.
1. Scope
1.1 This test method provides for the quantitative visual determination of the film thickness required to achieve full hiding. This
film thickness is considered to be the hiding power of a test paint.
1.2 This method applies only to spray applied coatings but its concepts are valid for other methods of application as well.
1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical
conversions to SI units that are provided for information only and are not considered standard.
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
2.1 ASTM Standards:
D16 Terminology for Paint, Related Coatings, Materials, and Applications
D609 Practice for Preparation of Cold-Rolled Steel Panels for Testing Paint, Varnish, Conversion Coatings, and Related Coating
Products
D1005 Test Method for Measurement of Dry-Film Thickness of Organic Coatings Using Micrometers
D1186 Test Methods for Nondestructive Measurement of Dry Film Thickness of Nonmagnetic Coatings Applied to a Ferrous
Base (Withdrawn 2006)
D1400 Test Method for Nondestructive Measurement of Dry Film Thickness of Nonconductive Coatings Applied to a
Nonferrous Metal Base (Withdrawn 2006)
D1729 Practice for Visual Appraisal of Colors and Color Differences of Diffusely-Illuminated Opaque Materials
D1730 Practices for Preparation of Aluminum and Aluminum-Alloy Surfaces for Painting
D2805 Test Method for Hiding Power of Paints by Reflectometry
E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
3. Terminology
3.1 Definitions—For definitions of terms used in this test method, refer to Terminology D16 and the Paint/Coatings Dictionary.
This test method is under the jurisdiction of ASTM Committee D01 on Paint and Related Coatings, Materials, and Applications and is the direct responsibility of
Subcommittee D01.26 on Optical Properties.
Current edition approved July 1, 2009Dec. 1, 2017. Published July 1, 2009December 2017. Originally approved in 2002. Last previous edition approved in 20022009 as
ɛ
D6762 – 02a.D6762 – 02a (2009) . DOI: 10.1520/D6762-02AR09E01.10.1520/D6762-02AR17.
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.
The last approved version of this historical standard is referenced on www.astm.org.
Published by the Federation of Societies for Coatings Technology, 492 Norristown Rd., Blue Bell, PA 19422.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D6762 − 02a (2017)
4. Summary of Test Method
4.1 The test paint is applied by means of spray application in a wedge-shaped film over a black and white, black and gray or
red and gray pattern so that a thickness variation is obtained, which provides excess hiding at one end of the pattern and partial
hiding at the other end of the pattern.
4.2 The dry film is examined under standard illumination to select the point where the pattern just becomes obscured. The
thickness of the film at this point is designated the hiding power of the paint.
5. Significance and Use
5.1 This test method determines hiding power of a test paint by visual evaluation of a spray applied coating.
NOTE 1—Test Method D2805 describes an instrumental method for determining hiding power. The paint film is applied at a uniform thickness (for
example with a doctor blade), the film thickness is measured rigorously, and the opacity is determined photometrically. Hiding power is thereby
determined with a high degree of precision.
5.2 Test Method D6762 is less precise than Test Method D2805, but is commonly used since it is more closely related to the
application characteristics of the paint and is simpler in concept and evaluation.
6. Apparatus
6.1 Test Surface, a smooth-surfaced paper chart, approximately 2 by 11 in., with a test pattern having adjacent black and white,
black and gray or red and gray areas and coated with a suitable varnish or lacquer so as to render the surface impervious to paint
liquids.
NOTE 2—The red, gray, white and black areas should fall in the following colorimetric range:
A A
CIE-Y % C h
Red 4–7 10–18 26–38
Gray 28–34
White 80–83
Black 1 max
A 10 2
Valid for Illuminant D65 or C , with 0°/45° geometry.
6.2 Illumination, a light source providing diffuse light of reasonable intensity, preferably northern sky light or an approximation
of the same (see Practice D1729).
6.3 Backer Panel, 4 by 12 in. steel or aluminum panel. A larger panel may be used if desired.
6.4 Film Thickness Measuring Device, a film thickness measuring device in accordance with Test Methods D1005, D1186, and
D1400.
6.5 Spray Equipment, either a hand spray gun or an automatic spray machine.
6.6 Oven, capable of maintaining the bake schedule for the product being evaluated.
6.7 Tape, masking or adhesive.
7. Preparation of Wedge-shaped Paint Film (Hand Spray)
7.1 Prepare the backer panel in accordance with Practices D609 or D1730.
7.2 Attach the desired test pattern to one side of the backer panel with masking tape or adhesive tape.
7.3 Reduce the material being tested to spray viscosity.
7.4 Attach spray gun to a suitable compressed air supply line and adjust air pressure for consistent fan spray.
7.5 Position
...