ASTM D2485-91(2013)
(Test Method)Standard Test Methods for Evaluating Coatings For High Temperature Service
Standard Test Methods for Evaluating Coatings For High Temperature Service
SIGNIFICANCE AND USE
4.1 Some coating systems are developed for use over steel that is exposed to high temperatures during service life. This method provides an accelerated means of determining the performance of these coating systems. Testing of coatings designed for interior service, and of coatings designed for exterior (weather-exposed) service is included.
SCOPE
1.1 These test methods cover the evaluation of the heat-resistant properties of coatings designed to protect steel surfaces exposed to elevated temperatures during their service life. Two test methods are described as follows:
Method A—Interior Service Coatings
Method B—Exterior Service Coatings
1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.3 This standard does not purport to address the safety concerns, if any, associated with its use. It is the responsibility of whoever uses this standard to consult and establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Specific hazard statements are given in Section 5.
General Information
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Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: D2485 − 91 (Reapproved 2013)
Standard Test Methods for
Evaluating Coatings For High Temperature Service
This standard is issued under the fixed designation D2485; 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.
1. Scope Dry Film Thickness of Nonmagnetic Coatings Applied to
a Ferrous Base (Withdrawn 2006)
1.1 These test methods cover the evaluation of the heat-
D2200 Practice for Use of Pictorial Surface Preparation
resistant properties of coatings designed to protect steel sur-
Standards and Guides for Painting Steel Surfaces
faces exposed to elevated temperatures during their service
G7 Practice for Atmospheric Environmental Exposure Test-
life. Two test methods are described as follows:
ing of Nonmetallic Materials
Method A—Interior Service Coatings
Method B—Exterior Service Coatings
3. Summary of Test Methods
1.2 The values stated in SI units are to be regarded as the
3.1 Panels suitably coated with the material under test are
standard. The values given in parentheses are for information
evaluated under one or both of two test methods depending on
only.
the intended usage.
1.3 This standard does not purport to address the safety
3.1.1 Test Method A, Interior Service Coatings—Coated
concerns, if any, associated with its use. It is the responsibility
panels are heated for 24 h in a muffle furnace at a temperature
of whoever uses this standard to consult and establish appro-
agreed upon between the purchaser and the seller. One panel is
priate safety and health practices and determine the applica-
plunged into water and the other cooled and then subjected to
bility of regulatory limitations prior to use. Specific hazard
a bend test.
statements are given in Section 5.
3.1.2 Test Method B, Exterior Service Coatings—Coated
panels are subjected to temperatures that increase in steps from
2. Referenced Documents
205 to 425°C (400 to 800°F). One panel is subjected to salt
spray for 24 h, and one is exposed outdoors for 12 months.
2.1 ASTM Standards:
A36/A36M Specification for Carbon Structural Steel
3.2 When tests are completed, the panels are examined for
A283/A283M Specification for Low and Intermediate Ten-
evidence of film degradation including rust formation,
sile Strength Carbon Steel Plates
blistering, loss of adhesion, dulling, and chalking.
A285/A285M Specification for Pressure Vessel Plates, Car-
bon Steel, Low- and Intermediate-Tensile Strength 4. Significance and Use
B117 Practice for Operating Salt Spray (Fog) Apparatus
4.1 Some coating systems are developed for use over steel
D522 Test Methods for Mandrel Bend Test of Attached
that is exposed to high temperatures during service life. This
Organic Coatings
method provides an accelerated means of determining the
D609 Practice for Preparation of Cold-Rolled Steel Panels
performance of these coating systems. Testing of coatings
for Testing Paint, Varnish, Conversion Coatings, and
designed for interior service, and of coatings designed for
Related Coating Products
exterior (weather-exposed) service is included.
D823 Practices for Producing Films of Uniform Thickness
of Paint, Varnish, and Related Products on Test Panels
5. Apparatus
D1186 Test Methods for Nondestructive Measurement of
5.1 Automatic spray equipment as described in Practices
D823 (Method A) or any other suitable method that will give
the required uniformity of film and film thickness.
These test methods are under the jurisdiction of ASTM Committee D01 on
Paint and Related Coatings, Materials, and Applications and are the direct 5.2 Muffle furnace capable of maintaining the temperatures
responsibility of Subcommittee D01.27 on Accelerated Testing.
described in 7.2 and 7.3.
Current edition approved June 1, 2013. Published June 2013. Originally
5.2.1 Warning—Due to the high temperatures involved in
approved in 1966. Last previous edition approved in 2007 as D2485 – 91 (2007).
operating the muffle furnace, extreme caution should be used.
DOI: 10.1520/D2485-91R13.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on The last approved version of this historical standard is referenced on
the ASTM website. www.astm.org.
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D2485 − 91 (2013)
5.3 Salt spray apparatus as described in Practice B117. mutually agreed upon between the purchaser and the seller. In
the absence of such a specified schedule use the following:
6. Panel Preparation
7.3.2 Place the panels in a muffle furnace maintained at
205°C (400°F) for 8 h, then increase the temperature to 260°C
6.1 Type—Panel dimensions shall be established by prior
(500°F) for 16 h. Increase the temperature in 55°C (100°F)
agreement between the purchaser and the seller. Use panels of
1 increments, alternating the time periods indicated, to the final
6.4 mm ( ⁄4 in.) hot-rolled steel conforming to Specification
temperature maximum previously agreed to between the pur-
A36/A36M or Specification A283/A283M, or when
chaser and the seller. Thus the schedule would be:
appropriate, Specification A285/A285M for the water quench
205°C (400°F) for 8 h
test in Test Method A, and for all tests under Test Method B.
260°C (500°F) for 16 h
For the bend test inTest MethodA, the panels must be thin and
315°C (600°F) for 8 h
soft enough to be bent as described in Test Methods D522.
370°C (700°F) for 16 h
6.2 Cleaning—Clean the panels for both test methods in
425°C (800°F) for 8 h
accordance with Practice D609, Methods B or D. Then, using
NOTE1—Manyhightemperaturepaintsdependuponserviceconditions
a fine silica sand (graded to pass through a No. 40 (425-µm)
to provide the extreme heat required to cure or sinter their films. If these
sieve), blas
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