ASTM D6762-02e1

NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
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Designation: D 6762 – 02
Standard Test Method for
Determining the Hiding Power of Paint by Visual Evaluation
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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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e NOTE—Research report was added editorially in July 2002.
1. Scope 3. Terminology
1.1 This test method provides for the quantitative visual 3.1 Definitions—For definitions of terms used in this test
determination of the film thickness required to achieve full method, refer to Terminology D 16 and the Paint/Coatings
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hiding. This film thickness is considered to be the hiding power Dictionary.
of a test paint.
4. Summary of Test Method
1.2 This method applies only to spray applied coatings but
4.1 The test paint is applied by means of spray application
its concepts are valid for other methods of application as well.
1.3 This standard does not purport to address all of the 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,
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro- which provides excess hiding at one end of the pattern and
partial hiding at the other end of the pattern.
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use. 4.2 The dry film is examined under standard illumination to
select the point where the pattern just becomes obscured. The
2. Referenced Documents
thickness of the film at this point is designated the hiding
2.1 ASTM Standards: power of the paint.
D 16 Terminology for Paint, Related Coatings, Materials,
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5. Significance and Use
and Applications
5.1 This test method determines hiding power of a test paint
D 609 Practice for Preparation of Cold-Rolled Steel Panels
for Testing Paint, Varnish, Conversion Coatings, and by visual evaluation of a spray applied coating.
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Related Coating Products
NOTE 1—Test Method D 2805 describes an instrumental method for
D 1005 Test Method for Measurement of Dry-Film Thick-
determining hiding power. The paint film is applied at a uniform thickness
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ness of Organic Coatings Using Micrometers
(for example with a doctor blade), the film thickness is measured
D 1186 Test Methods for Nondestructive Measurement of rigorously, and the opacity is determined photometrically. Hiding power is
thereby determined with a high degree of precision.
Dry Film Thickness of Nonmagnetic Coatings Applied to
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a Ferrous Base
5.2 Test Method D 6762 is less precise than Test Method
D 1400 Test Method for Nondestructive Measurement of
D 2805, but is commonly used since it is more closely related
Dry Film Thickness of Nonconductive Coatings Applied to
to the application characteristics of the paint and is simpler in
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a Nonferrous Metal Base
concept and evaluation.
D 1729 Practice for Visual Appraisal of Colors and Color
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6. Apparatus
Differences of Diffusely-Illuminated Opaque Materials
D 1730 Practices for Preparation of Aluminum and
6.1 Test Surface, a smooth-surfaced paper chart, approxi-
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Aluminum-Alloy Surfaces for Painting
mately 2 by 11 in., with a test pattern having adjacent black and
D 2805 Test Method for Hiding Power of Paints by Reflec-
white, black and gray or red and gray areas and coated with a
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tometry
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
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following colorimetric range:
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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NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
e1
D6762–02
A A
8.6 Remove the panel and flash and bake per the recom-
CIE-Y % C h
mended bake schedule.
Red 4–7 10–18 26–38
Gray 28–34
9. Evaluation Procedure
White 80–83
Black 1 max
9.1 Remove the panel from the oven and cool to room
A 10
...