ASTM D772-86(2011)
(Test Method)Standard Test Method for Evaluating Degree of Flaking (Scaling) of Exterior Paints
Standard Test Method for Evaluating Degree of Flaking (Scaling) of Exterior Paints
SIGNIFICANCE AND USE
Flaking (scaling) failure of paint films can occur in use. This test method provides a means of evaluating the degree of failure by comparing to pictorial standards.
SCOPE
1.1 This test method covers the evaluation of the degree of flaking (scaling) of exterior paints by comparison with photographic standards.
1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
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.
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Designation: D772 − 86 (Reapproved 2011)
Standard Test Method for
Evaluating Degree of Flaking (Scaling) of Exterior Paints
This standard is issued under the fixed designation D772; 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.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope by cracking or checking or blistering, and is the result of loss
of adhesion, usually due to stress-strain factors coming into
1.1 This test method covers the evaluation of the degree of
play.
flaking (scaling) of exterior paints by comparison with photo-
graphic standards.
4. Significance and Use
1.2 The values stated in SI units are to be regarded as the
4.1 Flaking (scaling) failure of paint films can occur in use.
standard. The values given in parentheses are for information
This test method provides a means of evaluating the degree of
only.
failure by comparing to pictorial standards.
1.3 This standard does not purport to address all of the
5. Type of Flaking (Scaling)
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
5.1 Only one type of flaking (scaling) is recognized, as
priate safety and health practices and determine the applica-
defined in Section 3.
bility of regulatory limitations prior to use.
6. Use of Photographic Reference Standards
2. Referenced Documents
6.1 The photographic reference standards that are part of
this test method and are provided in the Pictorial Standards of
2.1 ASTM Standards:
Coating Defects Handbook are representative of the degree of
D1150 Single and Multi-Panel Forms for Recording Results
cracking of exterior paint films. Fig. 1 is for illustration
of Exposure Tests of Paints
purposes only and should not be used for evaluation.
2.2 Other Standards:
6.2 The use of the photographic reference standards illus-
Pictorial Standards of Coating Defects Handbook
trated in Fig. 1 requires the following precautions:
6.2.1 Care must be taken not to confuse various types of
3. Terminology
failure that may be present on the same surface.
3.1 Definitions of Terms Specific to This Standard:
6.2.2 It must be realized that degree of failure will vary over
3.1.1 flaking (scaling), n—that phenomenon manifested in
any given area. Therefore, an average portion of the film
paint films by the actual detachment of pieces of the film itself
should be used for comparison. On larger surfaces it is
either from its substrate or from paint previously applied.
recommended that ratings be made at several locations and the
3.1.1.1 Discussion—Flaking (scaling) is generally preceded
mean and range reported.
6.2.3 In technical literature, a distinction is sometimes made
between flaking and scaling. In most cases, however, flaking
This test method is under the jurisdiction of ASTM Committee D01 on Paint
and scaling refer to the same phenomenon. In some instances,
and Related Coatings, Materials, andApplications and is the direct responsibility of
the term flaking is used to describe the detachment of pieces of
Subcommittee D01.25 on Evaluation of Weathering Effects.
film less than 6.4 mm ( ⁄4 in.) in size, and scaling, the
Current edition approved Nov. 1, 2011. Published November 2011. Originally
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