ASTM D746-04
(Test Method)Standard Test Method for Brittleness Temperature of Plastics and Elastomers by Impact
Standard Test Method for Brittleness Temperature of Plastics and Elastomers by Impact
SCOPE
1.1 This test method covers the determination of the temperature at which plastics and elastomers exhibit brittle failure under specified impact conditions. Two routine inspection and acceptance procedures are also provided. Note 1
When testing rubbers for impact brittleness use Test Methods D 2137.
1.2 The values stated in SI units are to be regarded as the standard.
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 2
This test method and ISO 974-2000 (E) are technically equivalent when using the Type B fixture and the Type III specimen, however, the minimum number of specimens that are required to be tested is significantly different when using this test method. The ISO method requires that a minimum of 100 specimens be tested.
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Designation:D 746–04
Standard Test Method for
Brittleness Temperature of Plastics and Elastomers by
1
Impact
This standard is issued under the fixed designation D 746; 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* E1137 Specification for Industrial Platinum Resistance
Thermometers
1.1 This test method covers the determination of the tem-
2.2 ISO Standard:
perature at which plastics and elastomers exhibit brittle failure
ISO974-1980 (E) Plastics—Determination of the Brittle-
under specified impact conditions. Two routine inspection and
3
ness Temperature by Impact
acceptance procedures are also provided.
NOTE 1—When testing rubbers for impact brittleness useTest Methods 3. Terminology
D2137.
3.1 General—The definitions of plastics used in this test
1.2 The values stated in SI units are to be regarded as the
method are in accordance with Test Method D883 unless
standard.
otherwise specified.
1.3 This standard does not purport to address all of the
3.2 brittleness temperature—that temperature, estimated
safety concerns, if any, associated with its use. It is the
statistically, at which 50% of the specimens would probably
responsibility of the user of this standard to establish appro-
fail.
priate safety and health practices and determine the applica-
4. Summary of Test Method
bility of regulatory limitations prior to use.
4.1 To determine the brittleness temperature, specimens are
NOTE 2—This test method and ISO974–2000 (E) are technically
secured to a specimen holder with a torque wrench. The
equivalent when using the Type B fixture and the Type III specimen,
specimen holder is immersed in a bath containing a heat-
however,theminimumnumberofspecimensthatarerequiredtobetested
is significantly different when using this test method. The ISO method transfer medium that is cooled. The specimens are struck at a
requires that a minimum of 100 specimens be tested.
specified linear speed and then examined. The brittleness
temperature is defined as the temperature at which 50% of the
2. Referenced Documents
specimens fail.
2
2.1 ASTM Standards:
5. Significance and Use
D618 Practice for Conditioning Plastics for Testing
D 832 Practice for Rubber Conditioning for Low-
5.1 This test method establishes the temperature at which
Temperature Testing
50% of the specimens tested fail when subjected to the
D883 Terminology Relating to Plastics
conditionsspecifiedherein.Thetestprovidesfortheevaluation
D2137 Test Methods for Rubber Property—Brittleness
oflong-timeeffectssuchascrystallization,orthoseeffectsthat
Point of Flexible Polymers and Coated Fabrics
areintroducedbylow-temperatureincompatibilityofplasticiz-
E77 Test Method for the Inspection and Verification of
ers in the material under test. Plastics and elastomers are used
Thermometers
inmanyapplicationsrequiringlow-temperatureflexingwithor
E220 Test Method for Calibration of Thermocouples by
withoutimpact.Usedataobtainedbythismethodtopredictthe
Comparison Techniques
behavior of plastic and elastomeric materials at low tempera-
E644 Test Methods for Testing Industrial Resistance Ther-
tures only in applications in which the conditions of deforma-
mometers
tion are similar to those specified in this test method. This test
method has been found useful for specification purposes, but
does not necessarily measure the lowest temperature at which
1
ThistestmethodisunderthejurisdictionofASTMCommitteeD20onPlastics
the material is suitable for use.
and is the direct responsibility of Subcommittee D20.30 on Thermal Properties
(Section D20.30.07).
NOTE 3—Suitable apparatus is commercially available from several
Current edition approved May 1, 2004. Published May 2004. Originally
approved in 1943. Last previous edition approved in 1998 as D746-98.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
3
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM ISO Standards Handbook 21, Vol 1. ISO Standards are available from
Standards volume information, refer to the standard’s Document Summary page on AmericanNationalStandardsInstitute(ANSI),25W.43rdSt.,4thFloor,NewYork,
the ASTM website. NY 10036.
*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.
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D746–04
6.3 Torque Wrench, 0 to 8.5 N·m.
NOTE 4—Because of the difference in geometry of the specimen
clamps, test results obtained when using the TypeAspecimen clamp and
strikingmembermaynotcorrelatewiththoser
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