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ASTM D6944-03

(Test Method)

Standard Test Method for Resistance of Cured Coatings to Thermal Cycling

Standard Test Method for Resistance of Cured Coatings to Thermal Cycling

SIGNIFICANCE AND USE
The purpose of this test is to obtain information on the ability of a coating system to adhere to substrates under thermal stress. It is assumed that the coating systems used are applied and cured according to the given specifications of the coating manufacturer.
SCOPE
1.1 This test method determines the resistance of cured coatings to repeated thermal cycles. This procedure is designed to assess the influence of thermal cycling on adhesion and other properties of coatings. This procedure is not intended to provide a quantitative measure of the service life that can be expected from a specific coating system on a given substrate.
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.

General Information

Status
Historical
Publication Date
09-Jul-2003
ICS
87.040 - Paints and varnishes
Technical Committee
D01 - Paint and Related Coatings, Materials, and Applications
Drafting Committee
D01.46 - Industrial Protective Coatings
Current Stage
Ref Project

Relations

Replaced By
ASTM D6944-09 - Standard Practice for Resistance of Cured Coatings to Thermal Cycling
Effective Date
01-Jul-2009
Referred By
ASTM D3794-22 - Standard Guide for Testing Coil Coatings
Effective Date
10-Jul-2003
Referred By
ASTM D6577-15(2019) - Standard Guide for Testing Industrial Protective Coatings
Effective Date
10-Jul-2003

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ASTM D6944-03 - Standard Test Method for Resistance of Cured Coatings to Thermal CyclingASTM D6944-03 - Standard Test Method for Resistance of Cured Coatings to Thermal Cycling
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ASTM D6944-03 - Standard Test Method for Resistance of Cured Coatings to Thermal Cycling
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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:D6944–03
Standard Test Method for
Resistance of Cured Coatings to Thermal Cycling
This standard is issued under the fixed designation D 6944; 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.
1. Scope 4. Significance and Use
1.1 This test method determines the resistance of cured 4.1 The purpose of this test is to obtain information on the
coatings to repeated thermal cycles.This procedure is designed ability of a coating system to adhere to substrates under
toassesstheinfluenceofthermalcyclingonadhesionandother thermal stress. It is assumed that the coating systems used are
properties of coatings. This procedure is not intended to applied and cured according to the given specifications of the
provide a quantitative measure of the service life that can be coating manufacturer.
expected from a specific coating system on a given substrate.
TEST METHOD A—FREEZE/THAW/IMMERSION
1.2 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
5. Apparatus
responsibility of the user of this standard to establish appro-
5.1 Thermal Cycling Apparatus:
priate safety and health practices and determine the applica-
5.1.1 The thermal cycling apparatus shall consist of a
bility of regulatory limitations prior to use.
suitable chamber or chambers in which the test specimens may
undergo the specified cycle. Ideally, a chamber which contains
2. Referenced Documents
heatingandrefrigerationequipmentandimmersioncapabilities
2.1 ASTM Standards:
in the same unit should be used. This chamber shall have the
D 660 Test Method for Evaluating Degree of Checking of
ability to maintain continuous reproducible cycles within the
Exterior Paints
specified temperature requirements. In the event that an appa-
D 661 Test Method for Evaluating Degree of Cracking of
ratus having freezing, heating, and immersion capabilities is
Exterior Paints
not available, separate equipment for freezing, heating and
D 714 Test Method for Evaluating Degree of Blistering of
immersion may be used.
Paints
5.1.2 The chamber or chambers shall have the ability to
D 3359 Test Methods for Measuring Adhesion by Tape
2 maintain a constant temperature during each of the respective
Test
temperature intervals as specified by the procedure.
D 4541 Test Method for Pull-Off Strength of Coatings
3 5.1.3 The samples shall be arranged to minimize contact
Using Portable Adhesion Testers
3 with the chamber surfaces or any mounting racks, and to
D 6677 Test Method for Evaluating Adhesion by Knife
maximize air flow.
G 147 Practice of Conditioning and Handling of Nonmetal-
4 5.1.4 The temperature of the thermal cycling apparatus shall
lic Materials for Natural and Artificial Weathering Tests
give uniform readings at various locations within the chamber,
3. Summary of Test Methods within3°C(5°F)atanygiventime,exceptduringthetransition
between heating and freezing cycles. A two hour temperature
3.1 Test Method A—Cured test specimens are subjected to
rampingperiodispermittedfortheequipmenttoreachthenext
30 thermal cycles of immersion, freezing and heating.
temperature setting.
3.2 Test Method B—Cured test specimens are subjected to
30 thermal cycles of freezing and heating.
6. Test Specimens
6.1 Apply each coating onto the substrate as agreed upon.
This test method is under the jurisdiction of ASTM Committee D01 on Paint
Minimum film thicknesses should take substrate profile into
and Related Coatings, Materials, andApplications and is the direct responsibility of
account when applied.
Subcommittee D01.46 on Industrial Protective Coatings.
Current edition approved July 10, 2003. Published August 2003.
Annual Book of ASTM Standards, Vol 06.01.
Annual Book of ASTM Standards, Vol 06.02.
Annual Book of ASTM Standards, Vol 14.04.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D6944–03
6.2 Apply each coating or coating system to a minimum of 8.1.3 The samples shall be arranged to minimize contact
two specimens to determine repeatability. If the substrate of with the chamber surfaces or any mounting racks, and to
choice is concrete, then suitable encapsulation of the substrate maximize air flow.
must occur as agreed upon between purchaser and supplier. 8.1.4 The temperature of the thermal cycling apparatus shall
6.2.1 When destructive tests are run, it is recommended that give uniform readings at various locations within the chamber,
a sufficient number of file specimens be retained so that the within3°C(5°F)atanygiventime,exceptduringthetransition
property of interest can be determined on unexposed file between freezing and heating.Atwo hour temperature ramping
specimens each time exposed materials are evaluated. period is permitted for the equipment to reach the next
6.2.2 Exposure of a similar material of known performance temperature setting.
(a control) at the same time as the test materials is strongly 8.2 Reproducibility of test results between laboratories h
...

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1.1 These test methods determine and report the hiding power of a powder coating with respect to two parameters:  
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1.6 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.

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5.1 Coatings attached to substrates are subjected to damaging impacts during the manufacture of articles and their use in service. In its use over many years, this test method for impact resistance has been found to be useful in predicting the performance of organic coatings for their ability to resist cracking caused by impacts.
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1.1 This test method covers a procedure for rapidly deforming by impact a coating film and its substrate and for evaluating the effect of such deformation.  
1.2 This test method should be restricted to testing in only one laboratory when numerical values are used because of the poor reproducibility of the method. Interlaboratory agreement is improved when ranking is used in place of numerical values.  
1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.  
1.4 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.  
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