ASTM D662-93(2000)
(Test Method)Standard Test Method for Evaluating Degree of Erosion of Exterior Paints
Standard Test Method for Evaluating Degree of Erosion of Exterior Paints
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 (Reapproved 2000)
Standard Test Method for
Evaluating Degree of Erosion of Exterior Paints
This standard is issued under the fixed designation D 662; 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.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope 6. Use of Photographic Reference Standards
1.1 This test method covers the evaluation of the degree of 6.1 The photographic reference standards that are part of
erosion of exterior paints by comparison with photographic this test method and are provided in the Pictorial Standards of
standards. Coating Defects Handbook are representative of the degree of
erosionofexteriorpaintfilms.Fig.1isforillustrationpurposes
2. Referenced Documents
only and should not be used for evaluation.
2.1 ASTM Standards:
6.2 The use of the photographic reference standards illus-
D 4214 Method for Evaluating Degree of Chalking of trated in Fig. 1 requires the following precautions:
Exterior Paint Film
6.2.1 Care must be taken not to confuse various types of
2.2 Other Standards: failure that may be present on the same surface.
Pictorial Standards of Coating Defects Handbook
6.2.2 It must be realized that the degree of failure will vary
over any given area. Therefore, an average portion of the film
3. Terminology
should be used for comparison. On larger surfaces it is
3.1 Definitions of Terms Specific to This Standard:
recommended that ratings be made at several locations and the
3.1.1 erosion, n—that phenomenon manifested in paint
mean and range reported.
films by the wearing away of the finish to expose the substrate
6.2.3 The photographic standards used represent various
or undercoat. The degree of failure is dependent on the amount
degrees of erosion of a white brushing type paint over a dark
ofsubstrateorundercoatvisible.Erosionoccursastheresultof
primer. This system was necessary to provide sufficient con-
chalking. (See Method D 4214 for evaluation of chalking.)
trast for photographic purposes. The erosion of a film to its
normal substrate is, however, readily visible to the naked eye
4. Significance and Use
so it may easily be compared to the standards and given a
4.1 Erosion failure of paint films can occur in use. This test
numerical rating.
method provides a mean of evaluating the degree of failure by
6.2.4 Indoubtfulcases,erosionissometimesmorevisiblein
comparing to pictorial standards.
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
5. Types of Erosion
a dry film.
5.1 Only one
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