ASTM D3769-96(2000)

Standard Test Method for Microcellular Urethanes--High Temperature Sag

SCOPE
1.1 This 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 the 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.

General Information

• Status: Historical
• Publication Date: 31-Dec-1999
• ICS: 83.100 - Cellular materials
• Technical Committee: D20 - Plastics
• Drafting Committee: D20.22 - Cellular Materials - Plastics and Elastomers

Relations

• Replaces: ASTM D3769-96 - Standard Test Method for Microcellular Urethanes--High Temperature Sag
• Effective Date: 01-Jan-2000
• Replaced By: ASTM D3769-05 - Standard Test Method for Microcellular Urethanes--High Temperature Sag
• Effective Date: 01-Nov-2005
• Referred By: ASTM D3489-23 - Standard Test Methods for Microcellular Urethane Materials
• Effective Date: 01-Jan-2000

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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:D3769–96 (Reapproved 2000)
Standard Test Method for
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 (e) 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 the
tioned in these test methods. If there are no material specifi-
standard.
cations, then the default conditions apply.
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
NOTE 2—This test method may be applied to solid urethanes.
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
to be considered constant through the test. See Fig. 1.
2.1 ASTM Standards:
4.2 Oven, conforming to the specifications for a Type I
D3040 Practice for Preparing Precision Statements for
laboratory oven in accordance with Specification E145.
Standards Related to Rubber and Rubber Testing
4.3 Scaled Rule, accurate to 1.0 mm.
E145 Specification for Gravity-Convection and Forced-
4.4 Thickness Indicator, accurate to 0.25 mm.
Ventilation Ovens
E691 Practice for Conducting and Interlaboratory Study to
5. Test Specimens
Determine the Precision of a Test Method
5.1 The test specimen shall have a minimum length of 125
3. Significance and Use
mm, and be 25 mm in width by the nominal thickness of the
plaque or part. The recommended standard test specimen is 4
3.1 This test method is used to indicate the deformation
mminthickness.Thinnerspecimensmaybeused,butshallnot
tendency of microcellular materials that may occur during
be less than 3 mm.
paint application in an assembly plant operation. Since a
5.2 Three specimens to each material shall be tested.
standard specimen is used, heat sag measurements cannot be
assumed to be exactly those which will occur on a part during
NOTE 3—If test specimens are cut from parts, the specimens must be
or after the paint application and baking operation of an
cutfromareasthatareofconstantthickness;thatis,noribs,bosses,holes,
assembly process.
or other section changes are allowed.
6. Conditioning
ThistestmethodisunderthejurisdictionofASTMCommitteeD20onPlastics
6.1 Unlessotherwisespecified,conditionthespecimensand
and is the direct responsibility of Subcommittee D20.22 on Cellular Materials—
fixture a minimum of1hat23 6 2°C and 50 6 5% relative
Plastics and Elastomers.
humidity before testing.
Current edition approvedAugust 10, 1996. Published February 1997. Originally
published as D3769–79. Last previous edition D3769–85(1990).
This revision includes the addition of the following: an ISO equivalency
7. Procedure
statement, a material specifications statement, and a keyword section. This revision
7.1 Measure the thickness in the clamping area of the test
also includes a change in the minimum height requirement of the test fixture, an
expanded description of the test figure, a change in the oven specification, a change specimen to the nearest 0.25 mm.
in the accuracy requirement for the scaled rule, and a change in the measuring
7.2 Clamp the specimen in the fixture with a 100-mm
procedure.
unsupported overhang. Primed or painted surfaces are to be
Discontinued—see 1986 Annual Book of ASTM Standards, Vols 09.01 and
mounted facing up.
09.02.
Annual Book of ASTM Standards, Vol 14.02.
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D3769
9.1.3 Tim
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