ASTM D662-93(2019)
(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
4.1 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.
1.2 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
General Information
Relations
Standards Content (Sample)
This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: D662 − 93 (Reapproved 2019)
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 U.S. Department of Defense.
1. Scope 4. Significance and Use
1.1 This test method covers the evaluation of the degree of
4.1 Erosion failure of paint films can occur in use. This test
erosion of exterior paints by comparison with photographic method provides a mean of evaluating the degree of failure by
standards.
comparing to pictorial standards.
1.2 This international standard was developed in accor-
5. Types of Erosion
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the
5.1 Only one type of erosion is recognized, as defined in
Development of International Standards, Guides and Recom-
Section 3.
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
6. Use of Photographic Reference Standards
6.1 The photographic reference standards that are part of
2. Referenced Documents
this test method and are provided in the Pictorial Standards of
2.1 ASTM Standards:
Coating Defects Handbook are representative of the degree of
D4214 Test Methods for Evaluating the Degree of Chalking
erosion of exterior paint films. Fig. 1 is for illustration purposes
of Exterior Paint Films
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 the degree of failure will vary
3.1.1 erosion,n—thatphenomenonmanifestedinpaintfilms
over any given area. Therefore, an average portion of the film
by the wearing away of the finish to expose the substrate or
should be used for comparison. On larger surfaces it is
undercoat.
recommended that ratings be made at several locations and the
3.1.1.1 Discussion—The degree of failure is dependent on
mean and range reported.
the amount of substrate or undercoat visible. Erosion occurs as
6.2.3 The photographic standards used represent various
the result of chalking. (See Test Methods D4214 for evaluation
degrees of erosion of a white brushing type paint over a dark
of chalking.)
primer. This system was necessary to provide sufficient con-
trast for photographic purposes. The erosion of a film to its
normal substrate is, however, readily visible to the naked eye
This test method is under the jurisdiction of ASTM Committee D01 on Paint
so it may easily be compared to the standards and given a
and Related Coatings, Materials, andApplic
...
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