ASTM D5945-96

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Designation: D 5945 – 96
AMERICAN SOCIETY FOR TESTING AND MATERIALS
100 Barr Harbor Dr., West Conshohocken, PA 19428
Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
Standard Test Method for
Determining Temperature of Deflection of Plastics and
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Ebonite Under Load
This standard is issued under the fixed designation D 5945; 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.
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1. Scope Under Flexural Load
D 5936 Specification for Multipurpose Test Specimens
1.1 This test method covers three procedures for determi-
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Used for Testing Plastics
nation of the temperature of deflection under load (bending
D 5939 Practice for Preparing Multipurpose Test Specimens
stress) of plastics and ebonite:
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and Bars of Thermoplastics by Injection Moulding
1.1.1 Test Method A, using a nominal surface stress of 1.80
D 5940 Practice for Preparing Small Plate Test Specimens
MPa;
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of Thermoplastics by Injection Moulding
1.1.2 Test Method B, using a nominal surface stress of 0.45
D 5944 Guide for Describing the General Principles for
MPa; and
Determining the Temperature of Deflection of Plastics
1.1.3 Test Method C, using a nominal surface stress of 8.00
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Under Load
MPa.
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2.2 ISO Standards:
1.2 The test specimens are tested in one of two positions,
ISO 75-2 Determination of Temperature of Deflection Un-
flatwise or edgewise, with the requirements on test specimen
der Load—Part 2: Plastics and Ebonite
dimensions being different in each case (see Guide D 5944,
ISO 293:1986, Plastics—Compression Moulding Test
Section 6).
Specimens of Thermoplastic Materials
1.3 See Guide D 5944, 1.3.
ISO 294, Plastics—Injection Moulding of Test Specimens
NOTE 1—The test methods give better reproducibility with amorphous
of Thermoplastic Materials
plastics than with semi-crystalline ones. With some materials, it may be
ISO 2818, Plastics—Preparation of Test Specimens by Ma-
necessary to anneal the test specimens to obtain reliable results. If applied,
chining
annealing procedures generally result in an increase in the temperature of
ISO 3167:1993, Plastics—Multipurpose Test Specimens
deflection under load (see 7.2 and 7.3).
1.4 This test method is identical to ISO 75-2. This test
3. Terminology
method is comparable to Test Method D 648, but neither test
3.1 Definitions—See Guide D 5944, Section 3.
method should be substituted for the other. The two test
methods may differ with respect to test specimen dimensions,
4. Principle
test specimen conditioning, test equipment, testing conditions,
4.1 A standard test specimen made of plastic or ebonite is
etc. The two test methods may not give the same results.
subjected to a bending stress to produce one of the nominal
1.5 The values stated in SI units are to be regarded as the
surface stresses given in 1.1. The temperature is raised at a
standard. The values given in parentheses are for information
uniform rate, and the temperature at which a specified deflec-
only.
tion occurs is measured.
1.6 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
5.
responsibility of the user of this standard to establish appro-
6. Apparatus
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
6.1 Means of Applying a Bending Stress:
6.1.1 See Guide D 5944, 6.1.
2. Referenced Documents
6.1.2 The span between the test specimen supports shall be
2.1 ASTM Standards:
64 6 1 mm if the specimen is tested in the flatwise position and
D 648 Test Method for Deflection Temperature of Plastics
100 6 2 mm if the specimen is tested in the edgewise position.
6.2 Heating Equipment—See Guide D 5944, 6.2.
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Bias This test method is under the jurisdiction of ASTM Committee D-20 on Annual Book of ASTM Standards, Vol 08.01.
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Plastics and is the direct responsibility of Subcommittee D20.61 on USA Technical Annual Book of ASTM Standards, Vol 08.03.
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Advisory Group for ISO/TC 61 on Plastics. Available from American National Standards Institute, 11 W. 42nd St., 13th
Current edition approved June 10, 1996. Published August 1996. Floor, New York, NY 10036.
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D 5945
6.3 Weights—See Guide D 5944, 6.3. (1) 1.80 MPa, in which case the procedure is designated Test
6.4 Temperature-Measuring Instrument—See Guide Method A;
D 5944, 6.4. (2) 0.45 MPa, in which case the procedure is designated Test
6.5 Deflection-Measuring Instrument—See Guide D 5944, Method B; or
6.5. (3) 8.00 MPa, in which case the procedure is designated Test
Method C.
7. Test Specimens
(1)
7.1 See Gu
...