ASTM D662-93(2005)
(Test Method)Standard Test Method for Evaluating Degree of Erosion of Exterior Paints
Standard Test Method for Evaluating Degree of Erosion of Exterior Paints
SIGNIFICANCE AND USE
Erosion failure of paint films can occur in use. This test method provides a mean of evaluating the degree of failure by comparing to pictorial standards.
SCOPE
1.1 This test method covers the evaluation of the degree of erosion of exterior paints by comparison with photographic standards.
General Information
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Standards Content (Sample)
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Designation:D662–93(Reapproved2005)
Standard Test Method for
Evaluating Degree of Erosion of Exterior Paints
This standard is issued under the fixed designation D662; 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 5. Types of Erosion
1.1 This test method covers the evaluation of the degree of 5.1 Only one type of erosion is recognized, as defined in
erosion of exterior paints by comparison with photographic Section 3.
standards.
6. Use of Photographic Reference Standards
2. Referenced Documents
6.1 The photographic reference standards that are part of
2.1 ASTM Standards: this test method and are provided in the Pictorial Standards of
D4214 Test Methods for Evaluating the Degree of Chalking Coating Defects Handbook are representative of the degree of
of Exterior Paint Films erosionofexteriorpaintfilms.Fig.1isforillustrationpurposes
2.2 Other Standards: only and should not be used for evaluation.
3 3
Pictorial Standards of Coating Defects Handbook 6.2 The use of the photographic reference standards illus-
trated in Fig. 1 requires the following precautions:
3. Terminology
6.2.1 Care must be taken not to confuse various types of
3.1 Definitions of Terms Specific to This Standard: failure that may be present on the same surface.
3.1.1 erosion, n—that phenomenon manifested in paint
6.2.2 It must be realized that the degree of failure will vary
films by the wearing away of the finish to expose the substrate over any given area. Therefore, an average portion of the film
or undercoat.
should be used for comparison. On larger surfaces it is
3.1.1.1 Discussion— The degree of failure is dependent on recommended that ratings be made at several locations and the
the amount of substrate or undercoat visible. Erosion occurs as
mean and range reported.
the result of chalking. (See Test Methods D4214 for evaluation 6.2.3 The photographic standards used represent various
of chalking.)
degrees of erosion of a white brushing type paint over a dark
primer. This system was necessary to provide sufficient con-
4. Significance and Use
trast for photographic purposes. The erosion of a film to its
4.1 Erosion failure of paint films can occur in use. This test
normal substrate is, however, readily visible to the naked eye
method provides a mean of evaluating the degree of failure by
so it may easily be compared to the standards and given a
comparing to pictorial standards.
numerical rating.
6.2.4 Indoubtfulcases,erosionissometimesmorevisiblein
a damp film than in a dry film. Also, with severe erosion, it is
often easier to rate the degree of erosion in a damp film than in
a dry film.
6.2.5 While erosion of a sprayed film is more regular in its
T
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