ASTM D6762-02a

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

SIGNIFICANCE AND USE
This test method determines hiding power of a test paint by visual evaluation of a spray applied coating.
Note 1—Test Method D 2805 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.
Test Method D 6762 is less precise than Test Method D 2805, 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 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: 09-Dec-2002
• 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 D6762-02e1 - Standard Test Method for Determining the Hiding Power of Paint by Visual Evaluation of Spray Applied Coatings
• Effective Date: 10-Dec-2002
• Replaced By: 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-Jul-2009
• Referred By: ASTM D7489-09(2017) - Standard Practice for Evaluating Touch-Up Properties of Architectural Coatings under Various Environmental Conditions
• Effective Date: 10-Dec-2002

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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
Standard Test Method for
Determining the Hiding Power of Paint by Visual Evaluation
1
of Spray Applied Coatings
This standard is issued under the fixed designation D 6762; 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 (e) indicates an editorial change since the last revision or reapproval.
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1. Scope Determine the Precision of a Test Method
1.1 This test method provides for the quantitative visual
3. Terminology
determination of the film thickness required to achieve full
3.1 Definitions—For definitions of terms used in this test
hiding.Thisfilmthicknessisconsideredtobethehidingpower
method, refer to Terminology D16 and the Paint/Coatings
of a test paint.
5
Dictionary.
1.2 This method applies only to spray applied coatings but
its concepts are valid for other methods of application as well.
4. Summary of Test Method
1.3 This standard does not purport to address all of the
4.1 The test paint is applied by means of spray application
safety concerns, if any, associated with its use. It is the
in a wedge-shaped film over a black and white, black and gray
responsibility of the user of this standard to establish appro-
or red and gray pattern so that a thickness variation is obtained,
priate safety and health practices and determine the applica-
which provides excess hiding at one end of the pattern and
bility of regulatory limitations prior to use.
partial hiding at the other end of the pattern.
4.2 The dry film is examined under standard illumination to
2. Referenced Documents
select the point where the pattern just becomes obscured. The
2.1 ASTM Standards:
thickness of the film at this point is designated the hiding
D16 Terminology for Paint, Related Coatings, Materials,
2 power of the paint.
and Applications
D 609 Practice for Preparation of Cold-Rolled Steel Panels
5. Significance and Use
for Testing Paint, Varnish, Conversion Coatings, and
2 5.1 This test method determines hiding power of a test paint
Related Coating Products
by visual evaluation of a spray applied coating.
D 1005 Test Method for Measurement of Dry-Film Thick-
2
ness of Organic Coatings Using Micrometers
NOTE 1—Test Method D 2805 describes an instrumental method for
D 1186 Test Methods for Nondestructive Measurement of determining hiding power.The paint film is applied at a uniform thickness
(for example with a doctor blade), the film thickness is measured
Dry Film Thickness of Nonmagnetic Coatings Applied to
2
rigorously, and the opacity is determined photometrically. Hiding power is
a Ferrous Base
thereby determined with a high degree of precision.
D 1400 Test Method for Nondestructive Measurement of
5.2 Test Method D 6762 is less precise than Test Method
DryFilmThicknessofNonconductiveCoatingsAppliedto
2
D 2805, but is commonly used since it is more closely related
a Nonferrous Metal Base
to the application characteristics of the paint and is simpler in
D 1729 Practice for Visual Appraisal of Colors and Color
2
concept and evaluation.
Differences of Diffusely-Illuminated Opaque Materials
D 1730 Practices for Preparation of Aluminum and
6. Apparatus
3
Aluminum-Alloy Surfaces for Painting
6.1 Test Surface, a smooth-surfaced paper chart, approxi-
D 2805 Test Method for Hiding Power of Paints by Reflec-
2
mately2by11in.,withatestpatternhavingadjacentblackand
tometry
white, black and gray or red and gray areas and coated with a
E 691 Practice for Conducting an Interlaboratory Study to
suitable varnish or lacquer so as to render the surface imper-
vious to paint liquids.
1 NOTE 2—The red, gray, white and black areas should fall in the
This test method is under the jurisdiction of ASTM Committee D01 on Paint
following colorimetric range:
and Related Coatings, Materials, andApplications and is the direct responsibility of
Subcommittee D01.26 on Optical Properties.
Current edition approved Dec. 10, 2002. Published February 2003. Originally
e1 4
approved in 2002. Last previous edition approved in 2002 as D 6762 - 02 . Annual Book of ASTM Standards, Vol 14.02.
2 5
Annual Book of ASTM Standards, Vol 06.01. Published by the Federation of Societies for Coatings Technology, 492
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Annual Book of ASTM Standards, Vol 02.05. Norristown Rd., Blue Bell, PA 19422.
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D6762–02a
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 ap-
proximation
...