ASTM D3769-10
(Test Method)Standard Test Method for Microcellular Urethanes--High Temperature Sag
Standard Test Method for Microcellular Urethanes--High Temperature Sag
SIGNIFICANCE AND USE
This test method is used to indicate the deformation tendency of microcellular materials that may occur during paint application in an assembly plant operation. Since a standard specimen is used, heat sag measurements cannot be assumed to be exactly those which will occur on a part during or after the paint application and baking operation of an assembly process.
Before proceeding with this test method, reference should be made to the specification of the material being tested. Any test specimen preparation, conditioning, or dimensions, or combination thereof, and testing parameters covered in the materials specification shall take precedence over those mentioned in these test methods. If there are no material specifications, then the default conditions apply.
Note 2—This test method is applicable to solid urethanes.
SCOPE
1.1 This test method covers the procedure and apparatus for measuring high-temperature sag of microcellular urethane materials.
1.2 The values stated in SI units are to be regarded as standard.
1.3 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.
Note 1—There is no similar or equivalent ISO standard to this test method.
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Designation: D3769 − 10
StandardTest Method for
1
Microcellular Urethanes—High-Temperature Sag
This standard is issued under the fixed designation D3769; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 3.2 Before proceeding with this test method, reference
shouldbemadetothespecificationofthematerialbeingtested.
1.1 Thistestmethodcoverstheprocedureandapparatusfor
Anytestspecimenpreparation,conditioning,ordimensions,or
measuring high-temperature sag of microcellular urethane
combination thereof, and testing parameters covered in the
materials.
materials specification shall take precedence over those men-
1.2 The values stated in SI units are to be regarded as
tioned in these test methods. If there are no material
standard.
specifications, then the default conditions apply.
1.3 This standard does not purport to address all of the
NOTE 2—This test method is applicable to solid urethanes.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
4. Apparatus
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use. 4.1 Test Fixture,capableofholdingthespecimensinafixed
cantilever position for the duration of the entire test procedure.
NOTE 1—There is no similar or equivalent ISO standard to this test
The test fixture shall be constructed from a material such as
method.
aluminum or steel that exhibits a low coefficient of linear
2. Referenced Documents
thermalexpansionandthereforeallowsthetestfixture’sheight
2
to be considered constant through the test. See Fig. 1.
2.1 ASTM Standards:
D3040Practice for Preparing Precision Statements for Stan-
4.2 Oven, conforming to the specifications for a Type IA
dards Related to Rubber and Rubber Testing (Withdrawn
laboratory oven in accordance with Specification E145.
3
1987)
4.3 Scaled Rule, accurate to 1 mm.
E145Specification for Gravity-Convection and Forced-
Ventilation Ovens
4.4 Thickness Indicator, accurate to 0.03 mm.
E691Practice for Conducting an Interlaboratory Study to
4.5 Base, a flat, smooth surface free of any surface irregu-
Determine the Precision of a Test Method
larities that would affect the height measurements. The base
mustbeheat-resistanttothemaximumtemperaturethatthetest
3. Significance and Use
fixtures will be exposed.
3.1 This test method is used to indicate the deformation
tendency of microcellular materials that may occur during
5. Test Specimens
paint application in an assembly plant operation. Since a
standard specimen is used, heat sag measurements cannot be 5.1 The test specimen shall have a minimum length of 125
assumed to be exactly those which will occur on a part during mm, and be 25 6 1 mm in width by the nominal thickness of
or after the paint application and baking operation of an theplaqueorpart.Therecommendedstandardtestspecimenis
assembly process. 4 mm in thickness. The minimum specimen thickness shall be
3 mm.
1
ThistestmethodisunderthejurisdictionofASTMCommitteeD20onPlastics 5.2 Three specimens to each material shall be tested.
and is the direct responsibility of Subcommittee D20.22 on Cellular Materials -
Plastics and Elastomers. NOTE3—Iftestspecimensarecutfromparts,thespecimensmustbecut
Current edition approved Aug. 1, 2010. Published August 2010. Originally
from areas that are of constant thickness; that is, no ribs, bosses, holes, or
approved in 1979. Last previous edition approved in 2005 as D3769-05. DOI:
other section changes are allowed.
10.1520/D3769-10.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
6. Conditioning
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
6.1 Unlessotherwisespecified,conditionthespecimensand
the ASTM website.
3
fixture a minimum of1hat23 6 2°C and 50 6 10% relative
The last approved version of this historical standard is referenced on
www.astm.org. humidity before testing.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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D3769 − 10
8. Calculation
8.1 Sag= A − A.
o f
9. Report
9.1 The report shall include the following:
9.1.1 Direction of cutting,
9.1.2 Conditioning procedures before testing,
9.1.3 Time and temperature of the test,
9.1.4 Initial value at 23°C, average of three,
9.1.5 Final sag value at test temperature, average of three,
and
9.1.6 Specimen thickness.
10. Precision and Bias
10.1 Table1isbasedonaroundrobinconductedin
...
This document is not anASTM standard and is intended only to provide the user of anASTM 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.
Designation:D3769–05 Designation:D3769–10
Standard Test Method for
1
Microcellular Urethanes—High-Temperature Sag
This standard is issued under the fixed designation D3769; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope *
1.1 This test method covers the procedure and apparatus for measuring high-temperature sag of microcellular urethane
materials.
1.2 The values stated in SI units are to be regarded as standard.
1.3 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.
NOTE 1—There is no similar or equivalent ISO standard to this test method.
2. Referenced Documents
2
2.1 ASTM Standards:
3
D3040 Practice for Preparing Precision Statements for Standards Related to Rubber and Rubber Testing
E145 Specification for Gravity-Convection and Forced-Ventilation Ovens
E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
3. Significance and Use
3.1 This test method is used to indicate the deformation tendency of microcellular materials that may occur during paint
application in an assembly plant operation. Since a standard specimen is used, heat sag measurements cannot be assumed to be
exactly those which will occur on a part during or after the paint application and baking operation of an assembly process.
3.2 Beforeproceedingwiththistestmethod,referenceshouldbemadetothespecificationofthematerialbeingtested.Anytest
specimen preparation, conditioning, or dimensions, or combination thereof, and testing parameters covered in the materials
specification shall take precedence over those mentioned in these test methods. If there are no material specifications, then the
default conditions apply.
NOTE 2—This test method is applicable to solid urethanes.
4. Apparatus
4.1 TestFixture,capableofholdingthespecimensinafixedcantileverpositionforthedurationoftheentiretestprocedure.The
testfixtureshallbeconstructedfromamaterialsuchasaluminumorsteelthatexhibitsalowcoefficientoflinearthermalexpansion
and therefore allows the test fixture’s height to be considered constant through the test. See Fig. 1.
4.2 Oven, conforming to the specifications for a Type IA laboratory oven in accordance with Specification E145.
4.3 Scaled Rule, accurate to 1 mm.
4.4 Thickness Indicator, accurate to 0.03 mm.
4.5 Base, a flat, smooth surface free of any surface irregularities that would affect the height measurements. The base must be
heat-resistant to the maximum temperature that the test fixtures will be exposed.
5. Test Specimens
5.1The5.1 The test specimen shall have a minimum length of 125 mm, and be 25 6 1 mm in width by the nominal thickness
1
This test method is under the jurisdiction ofASTM Committee D20 on Plastics and is the direct responsibility of Subcommittee D20.22 on Cellular Materials - Plastics
and Elastomers.
Current edition approved Nov.Aug. 1, 2005.2010. Published November 2005.August 2010. Originally approved in 1979. Last previous edition approved in 20002005 as
D3769-96(2000).D3769-05. DOI: 10.1520/D3769-105.
2
ForreferencedASTMstandards,visittheASTMwebsite,www.astm.org,orcontactASTMCustomerServiceatservice@astm.org.For Annual Book ofASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
3
Withdrawn
3
Withdrawn.
*A Summary of Changes section appears at the end of this standard.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1
---------------------- Page: 1 ----------------------
D3769–10
NOTE 1—Not to scale.
FIG. 1 Fixture for High-Temperature Sag
of the plaque or part. The recommended standard test specimen is 4 mm in thickness. The minimum specimen thickness shall be
3 mm.
5.2 Three specimens to each material shall be tested.
NOTE 3—If test specimens are cut from parts, the specimens must be cut from areas that are of constant thickness; that is, no ribs, bosses, holes, or
other section changes are allowed.
6. Conditioning
6.1 Unless otherwise specified, condition the specimens and fixture a minimum of1hat23 6 2°C and 50 6 5%10% relative
humidity before testing.
7. Pro
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