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ASTM D6944-15

(Practice)

Standard Practice for Determining the Resistance of Cured Coatings to Thermal Cycling

Standard Practice for Determining the Resistance of Cured Coatings to Thermal Cycling

SIGNIFICANCE AND USE
4.1 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 tested are applied and cured according to the coating manufacturer’s instructions.
SCOPE
1.1 This practice determines the resistance of cured coatings or coating systems to repeated thermal cycles and is designed to assess the effect of thermal cycling on the properties of a coating or coating system. These properties may include adhesion, resistance to checking, cracking, blistering, or others. 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
30-Jun-2015
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

Replaces
ASTM D6944-09e1 - Standard Practice for Resistance of Cured Coatings to Thermal Cycling
Effective Date
01-Jul-2015
Replaced By
ASTM D6944-15(2020) - Standard Practice for Determining the Resistance of Cured Coatings to Thermal Cycling
Effective Date
01-Feb-2020
Referred By
ASTM D3794-22 - Standard Guide for Testing Coil Coatings
Effective Date
01-Jul-2015
Referred By
ASTM D6577-15(2019) - Standard Guide for Testing Industrial Protective Coatings
Effective Date
01-Jul-2015

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REDLINE ASTM D6944-15 - Standard Practice for Determining the Resistance of Cured Coatings to Thermal CyclingREDLINE ASTM D6944-15 - Standard Practice for Determining the Resistance of Cured Coatings to Thermal Cycling
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REDLINE ASTM D6944-15 - Standard Practice for Determining the Resistance of Cured Coatings to Thermal Cycling
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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: D6944 − 15
Standard Practice for
Determining the Resistance of Cured Coatings to Thermal
1
Cycling
This standard is issued under the fixed designation D6944; 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 Ferrous Metals and Nonmagnetic, Nonconductive Coat-
ings Applied to Non-Ferrous Metals
1.1 Thispracticedeterminestheresistanceofcuredcoatings
D7234 Test Method for Pull-OffAdhesion Strength of Coat-
or coating systems to repeated thermal cycles and is designed
ings on Concrete Using Portable Pull-Off Adhesion Tes-
to assess the effect of thermal cycling on the properties of a
ters
coating or coating system. These properties may include
G147 Practice for Conditioning and Handling of Nonmetal-
adhesion,resistancetochecking,cracking,blistering,orothers.
lic Materials for Natural and Artificial Weathering Tests
This procedure is not intended to provide a quantitative
measure of the service life that can be expected from a specific
3. Summary of Test Methods
coating system on a given substrate.
3.1 Test Method A—Cured test specimens are subjected to
1.2 This standard does not purport to address all of the
30 thermal cycles of immersion, freezing and heating.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
3.2 Test Method B—Cured test specimens are subjected to
priate safety and health practices and determine the applica-
30 thermal cycles of freezing and heating.
bility of regulatory limitations prior to use.
4. Significance and Use
2. Referenced Documents
4.1 The purpose of this test is to obtain information on the
2
2.1 ASTM Standards:
ability of a coating system to adhere to substrates under
D660 Test Method for Evaluating Degree of Checking of
thermal stress. It is assumed that the coating systems tested are
Exterior Paints
applied and cured according to the coating manufacturer’s
D661 Test Method for Evaluating Degree of Cracking of
instructions.
Exterior Paints
D714 Test Method for Evaluating Degree of Blistering of
TEST METHOD A—FREEZE/THAW/IMMERSION
Paints
D3359 Test Methods for Measuring Adhesion by Tape Test
5. Apparatus
D4541 Test Method for Pull-Off Strength of Coatings Using
Portable Adhesion Testers
5.1 Thermal Cycling Apparatus:
D6132 Test Method for Nondestructive Measurement of Dry
5.1.1 The thermal cycling apparatus shall consist of a
Film Thickness of Applied Organic Coatings Using an
suitable chamber or chambers in which the test specimens may
Ultrasonic Coating Thickness Gage
undergo the specified cycle. Ideally, a chamber which contains
D6677 Test Method for Evaluating Adhesion by Knife heatingandrefrigerationequipmentandimmersioncapabilities
D7091 Practice for Nondestructive Measurement of Dry
in the same unit should be used. This chamber shall have the
Film Thickness of Nonmagnetic Coatings Applied to ability to maintain continuous reproducible cycles within the
specified temperature requirements. In the event that an appa-
ratus having freezing, heating, and immersion capabilities is
1
This practice is under the jurisdiction of ASTM Committee D01 on Paint and
not available, separate equipment for freezing, heating and
Related Coatings, Materials, and Applications and is the direct responsibility of
immersion may be used.
Subcommittee D01.46 on Industrial Protective Coatings.
5.1.2 The chamber or chambers shall have the ability to
Current edition approved July 1, 2015. Published July 2015. Originally approved
ε1
maintain a constant temperature during each of the respective
in 2003. Last previous edition approved in 2009 as D6944 – 09 . DOI: 10.1520/
D6944-15.
temperature intervals as specified by the procedure.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
5.1.3 The samples shall be arranged to minimize contact
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
with the chamber surfaces or any mounting racks, and to
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. maximize air flow.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
D6944 − 15
5.1.4 The temperature of the thermal cycling apparatus shall holidays). Evaluate specimens either every 5 cycles or at the
give uniform readings at various locations within the chamber, end of 30 cycles. Destructive tests are typically performed at
within 3°C (5°F) at any given time, except during the transition the completion o
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
´1
Designation: D6944 − 09 D6944 − 15
Standard Practice for
Determining the Resistance of Cured Coatings to Thermal
1
Cycling
This standard is issued under the fixed designation D6944; 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
ε NOTE—Editorial corrections were made in 7.1.2 and 10.1.2 in March 2014.
1. Scope
1.1 This practice determines the resistance of cured coatings or coating systems to repeated thermal cycles. This procedure
cycles and is designed to assess the influenceeffect of thermal cycling on adhesion and other properties of coatings. the properties
of a coating or coating system. These properties may include adhesion, resistance to checking, cracking, blistering, or others. 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.
2. Referenced Documents
2
2.1 ASTM Standards:
D660 Test Method for Evaluating Degree of Checking of Exterior Paints
D661 Test Method for Evaluating Degree of Cracking of Exterior Paints
D714 Test Method for Evaluating Degree of Blistering of Paints
D3359 Test Methods for Measuring Adhesion by Tape Test
D4541 Test Method for Pull-Off Strength of Coatings Using Portable Adhesion Testers
D6132 Test Method for Nondestructive Measurement of Dry Film Thickness of Applied Organic Coatings Using an Ultrasonic
Coating Thickness Gage
D6677 Test Method for Evaluating Adhesion by Knife
D7091 Practice for Nondestructive Measurement of Dry Film Thickness of Nonmagnetic Coatings Applied to Ferrous Metals
and Nonmagnetic, Nonconductive Coatings Applied to Non-Ferrous Metals
D7234 Test Method for Pull-Off Adhesion Strength of Coatings on Concrete Using Portable Pull-Off Adhesion Testers
G147 Practice for Conditioning and Handling of Nonmetallic Materials for Natural and Artificial Weathering Tests
3. Summary of Test Methods
3.1 Test Method A—Cured test specimens are subjected to 30 thermal cycles of immersion, freezing and heating.
3.2 Test Method B—Cured test specimens are subjected to 30 thermal cycles of freezing and heating.
4. Significance and Use
4.1 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 usedtested are applied and cured according to the given specifications of the coating
manufacturer.coating manufacturer’s instructions.
1
This practice is under the jurisdiction of ASTM Committee D01 on Paint and Related Coatings, Materials, and Applications and is the direct responsibility of
Subcommittee D01.46 on Industrial Protective Coatings.
Current edition approved July 1, 2009July 1, 2015. Published July 2009July 2015. Originally approved in 2003. Last previous edition approved in 20032009 as D6944 –
ε1
03.09 . DOI: 10.1520/D6944-09E01.10.1520/D6944-15.
2
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’sstandard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
D6944 − 15
TEST METHOD A—FREEZE/THAW/IMMERSION
5. Apparatus
5.1 Thermal Cycling Apparatus:
5.1.1 The thermal cycling apparatus shall consist of a suitable chamber or chambers in which the test specimens may undergo
the specified cycle. Ideally, a chamber which contains heating and refrigeration equipment and immersion capabilities in the same
unit should be used. This chamber shall have the ability to maintain continuous reproducible cycles within the specified
temperature requirements. In the event that an apparatus having freezing, heating, and immersion capabilities is not available,
separate equipment for freezing, heating and immersion may be used.
5.1.2 The chamber or chambers shall have the ability to maintain a cons
...

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