ASTM D6762-02
(Test Method)Standard Test Method for Determining the Hiding Power of Paint by Visual Evaluation of Spray Applied Coatings
Standard Test Method for Determining the Hiding Power of Paint by Visual Evaluation of Spray Applied Coatings
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
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Standards Content (Sample)
Designation: D 6762 – 02
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.
1. Scope method, refer to Terminology D 16 and the Paint/Coatings
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Dictionary.
1.1 This test method provides for the quantitative visual
determination of the film thickness required to achieve full
4. Summary of Test Method
hiding. This film thickness is considered to be the hiding power
4.1 The test paint is applied by means of spray application
of a test paint.
in a wedge-shaped film over a black and white, black and gray
1.2 This method applies only to spray applied coatings but
or red and gray pattern so that a thickness variation is obtained,
its concepts are valid for other methods of application as well.
which provides excess hiding at one end of the pattern and
1.3 This standard does not purport to address all of the
partial hiding at the other end of the pattern.
safety concerns, if any, associated with its use. It is the
4.2 The dry film is examined under standard illumination to
responsibility of the user of this standard to establish appro-
select the point where the pattern just becomes obscured. The
priate safety and health practices and determine the applica-
thickness of the film at this point is designated the hiding
bility of regulatory limitations prior to use.
power of the paint.
2. Referenced Documents
5. Significance and Use
2.1 ASTM Standards:
5.1 This test method determines hiding power of a test paint
D 16 Terminology for Paint, Related Coatings, Materials,
2 by visual evaluation of a spray applied coating.
and Applications
D 609 Practice for Preparation of Cold-Rolled Steel Panels
NOTE 1—Test Method D 2805 describes an instrumental method for
for Testing Paint, Varnish, Conversion Coatings, and determining hiding power. The paint film is applied at a uniform thickness
2
(for example with a doctor blade), the film thickness is measured
Related Coating Products
rigorously, and the opacity is determined photometrically. Hiding power is
D 1005 Test Method for Measurement of Dry-Film Thick-
2 thereby determined with a high degree of precision.
ness of Organic Coatings Using Micrometers
5.2 Test Method D 6762 is less precise than Test Method
D 1186 Test Methods for Nondestructive Measurement of
D 2805, but is commonly used since it is more closely related
Dry Film Thickness of Nonmagnetic Coatings Applied to
2
to the application characteristics of the paint and is simpler in
a Ferrous Base
concept and evaluation.
D 1400 Test Method for Nondestructive Measurement of
Dry Film Thickness of Nonconductive Coatings Applied to
6. Apparatus
2
a Nonferrous Metal Base
6.1 Test Surface, a smooth-surfaced paper chart, approxi-
D 1729 Practice for Visual Appraisal of Colors and Color
2
mately 2 by 11 in., with a test pattern having adjacent black and
Differences of Diffusely-Illuminated Opaque Materials
white, black and gray or red and gray areas and coated with a
D 1730 Practices for Preparation of Aluminum and
3
suitable varnish or lacquer so as to render the surface imper-
Aluminum-Alloy Surfaces for Painting
vious to paint liquids.
D 2805 Test Method for Hiding Power of Paints by Reflec-
2
tometry
NOTE 2—The red, gray, white and black areas should fall in the
following colorimetric range:
3. Terminology
A A
CIE-Y % C h
3.1 Definitions—For definitions of terms used in this test
Red 4–7 10–18 26–38
Gray 28–34
1 White 80–83
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 March 10, 2002. Published May 2002.
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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.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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D 6762
A A
9. Evaluation Procedure
CIE-Y % C h
9.1 Remove the panel from the oven and cool to room
Black 1 max
temperature.
A 10 2
Valid for Illuminant D65 or C , with 0°/45° geometry.
9.2 Examine the test panel, as shown in Fig. 1, under
6.2 Illumination, a light source providing diffuse light of
illumination conditions as described in 6.2 at a viewing angle
reasonable intensity, preferably northern sky light or an ap-
perpendicular to the surface of the panel, and select the point
proximation of the same (see Practice D 1729).
where the test pattern is just barely or no l
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