ASTM D714-02(2017)

Standard Test Method for Evaluating Degree of Blistering of Paints

SIGNIFICANCE AND USE
3.1 A phenomenon peculiar to painted surfaces is the formation of blisters relative to some system weakness. This test method provides a standard procedure of describing the size and density of the blisters so that comparisons of severity can be made.
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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.3 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

• Status: Published
• Publication Date: 30-Nov-2017
• ICS: 87.040 - Paints and varnishes
• Technical Committee: D01 - Paint and Related Coatings, Materials, and Applications
• Drafting Committee: D01.25 - Evaluation of Weathering Effects

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: D714 − 02 (Reapproved 2017)
Standard Test Method for
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Evaluating Degree of Blistering of Paints
This standard is issued under the fixed designation D714; 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. Reference Standards
1.1 This test method employs photographic reference stan- 4.1 The photographic reference standards are glossy
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dards to evaluate the degree of blistering that may develop prints. Figs. 1-4 are reproductions of these standards and are
when paint systems are subjected to conditions which will included to illustrate two characteristics of blistering: size and
cause blistering.While primarily intended for use on metal and frequency.
other nonporous surfaces, this test method may be used to
4.2 Size—Reference standards have been selected for four
evaluate blisters on porous surfaces, such as wood, if the size
steps as to size on a numerical scale from 10 to 0, in which No.
of blisters falls within the scope of these reference standards.
10representsnoblistering.BlisteringstandardNo.8represents
When the reference standards are used as a specification of
the smallest size blister easily seen by the unaided eye.
performance, the permissible degree of blistering of the paint
Blistering standards Nos. 6, 4, and 2 represent progressively
system shall be agreed upon by the purchaser and the seller.
larger sizes.
1.2 This standard does not purport to address all of the
4.3 Frequency—Reference standards have been selected for
safety concerns, if any, associated with its use. It is the
four steps in frequency at each step in size, designated as
responsibility of the user of this standard to establish appro-
follows:
priate safety, health, and environmental practices and deter-
Dense, D,
mine the applicability of regulatory limitations prior to use.
Medium dense, MD,
1.3 This international standard was developed in accor-
Medium, M, and
Few, F.
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the
NOTE1—Aquantitativephysicaldescriptionofblisteringwouldinclude
Development of International Standards, Guides and Recom- the following characteristics determined by actual count:
Size distribution in terms of mensuration units,
mendations issued by the World Trade Organization Technical
Frequency of occurrence per unit area,
Barriers to Trade (TBT) Committee.
Pattern of distribution over the surface, and
Shape of blister
2. Referenced Documents
For the usual tests, an actual count is more elaborate than is necessary.
2.1 ASTM Adjuncts:
5. Procedure
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Reference Standards for Blistering of Paint Coatings
5.1 Subject the paint film to the test conditions agreed upon
by the purchaser and the seller.Then evaluate the paint film for
3. Significance and Use
the degree of blistering by comparison with the photographic
3.1 A phenomenon peculiar to painted surfaces is the
reference standards in Figs. 1-4.
formation of blisters relative to some system weakness. This
test method provides a standard procedure of describing the
6. Report
size and density of the blisters so that comparisons of severity
6.1 Report blistering as a number (Note 2) designating the
can be made.
size of the blisters and a qualitative term or symbol indicating
the frequency.
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This test method is under the jurisdiction of ASTM Committee D01 on Paint
6.2 Intermediate steps in size or frequency of blisters may
and Related Coatings, Materials, andApplications and is the direct responsibility of
be judged by interpolation.
Subcommittee D01.25 on Evaluation of Weathering Effects.
Current edition approved Dec. 1, 2017. Published December 2017. Originally
6.3 When the distribution of blisters over the area has a
approved in 1943. Last previous edition approved in 2009 as D714–02 (2009). DOI:
nonuniform pattern, use an additional phrase to describe the
10.1520/D0714-02R17.
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distribution, such as “small clusters,” or “large patches.”
Glossy prints of the photographic reference standards showing types of
blistering are available from ASTM International Headquarters. Order Adjunct No.
ADJD0714. Original adjunct produced in 1986.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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D714 − 02 (2017)
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