ASTM D714-87(2000)
(Test Method)Standard Test Method for Evaluating Degree of Blistering of Paints
Standard Test Method for Evaluating Degree of Blistering of Paints
SCOPE
1.1 This test method employs photographic reference standards to evaluate the degree of blistering that may develop when paint systems are subjected to conditions which will cause blistering. While primarily intended for use on metal and other nonporous surfaces, this test method may be used to evaluate blisters on porous surfaces, such as wood, if the size of blisters falls within the scope of these reference standards. When the reference standards are used as a specification of performance, the permissible degree of blistering of the paint system shall be agreed upon by the purchaser and the seller.
1.2 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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NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
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Designation: D 714 – 87 (Reapproved 2000)
Standard Test Method for
Evaluating Degree of Blistering of Paints
This standard is issued under the fixed designation D 714; 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 the smallest size blister easily seen by the unaided eye.
Blistering standards Nos. 6, 4, and 2 represent progressively
1.1 This test method employs photographic reference stan-
larger sizes.
dards to evaluate the degree of blistering that may develop
3.3 Frequency—Reference standards have been selected for
when paint systems are subjected to conditions which will
four steps in frequency at each step in size, designated as
cause blistering. While primarily intended for use on metal and
follows:
other nonporous surfaces, this test method may be used to
Dense, D,
evaluate blisters on porous surfaces, such as wood, if the size
Medium dense, MD,
of blisters falls within the scope of these reference standards.
Medium, M, and
When the reference standards are used as a specification of
Few, F.
performance, the permissible degree of blistering of the paint
NOTE 1—A quantitative physical description of blistering would in-
system shall be agreed upon by the purchaser and the seller.
clude the following characteristics determined by actual count:
1.2 This standard does not purport to address all of the
Size distribution in terms of mensuration units,
safety concerns, if any, associated with its use. It is the
Frequency of occurrence per unit area,
responsibility of the user of this standard to establish appro-
Pattern of distribution over the surface, and
priate safety and health practices and determine the applica-
Shape of blister
For the usual tests, an actual count is more elaborate than is necessary.
bility of regulatory limitations prior to use.
4. Procedure
2. Significance and Use
4.1 Subject the paint film to the test conditions agreed upon
2.1 A phenomenon peculiar to painted surfaces is the
by the purchaser and the seller. Then evaluate the paint film for
formation of blisters relative to some system weakness. This
the degree of blistering by comparison with the photographic
test method provides a standard procedure of describing the
reference standards in Figs. 1-4.
size and density of the blisters so that comparisons of severity
can be made.
5. Report
3. Reference Standards
5.1 Report blistering as a number (Note 2) designating the
size of the blisters and a qualitative term or symbol indicating
3.1 The photographic reference standards are glossy prints.
the frequency.
Figs. 1-4 are reproductions of these standards and are included
to illustrate two characteristics of blistering: size and fre- 5.2 Intermediate steps in size or frequency of blisters may
be judged by interpolation.
quency.
3.2 Size—Reference standards have been selected for four 5.3 When the distribution of blisters over the area has a
nonuniform pattern, use an additional phrase to describe the
steps as to size on a numerical scale from 10 to 0, in which No.
10 represents no blistering. Blistering standard No. 8 represents distribution, su
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