ASTM D5943-96

Test Method for Determination of Flexural Properties (Withdrawn 1998)

General Information

• Status: Withdrawn
• Withdrawal Date: 09-Apr-1998
• ICS: 83.080.01 - Plastics in general
• Technical Committee: D20 - Plastics
• Drafting Committee: D20.61 - US TAG ISO/TC-61 on Plastics

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: D 5943 – 96
AMERICAN SOCIETY FOR TESTING AND MATERIALS
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Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
Standard Test Method for
1
Determining Flexural Properties of Plastics
This standard is issued under the fixed designation D 5943; 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.
1. Scope factors must be controlled and recorded carefully.
1.7 Flexural properties can be used for engineering design
1.1 This test method specifies a procedure for determining
purposes only for materials with linear stress/strain behavior.
the flexural properties of plastics under defined conditions. A
For non-linear material behavior the flexural properties are
standard test specimen is defined, but parameters are included
only nominal. The bending test should be used preferentially
for alternative specimen sizes for use where appropriate. A
with brittle materials, for which tensile tests are difficult.
range of testing speeds is included.
1.8 This test method is identical to ISO 178. This test
1.2 The procedure is used for investigating the flexural
method is comparable to Test Methods D 790, but neither test
behavior of the test specimens and for determining the flexural
method should be substituted for the other. The two test
strength, flexural modulus, and other aspects of the flexural
methods may differ with respect to test specimen dimensions,
stress/strain relationship under the conditions defined. It ap-
test specimen conditioning, test equipment, testing conditions,
plies to a freely supported beam, loaded at midspan (three-
etc. The two test methods may not give the same results.
point loading test).
1.9 The values stated in SI units are to be regarded as the
1.3 The procedure is suitable for use with the following
standard. The values given in parentheses are for information
range of materials:
only.
1.3.1 Thermoplastics molding and extrusion materials, in-
1.10 This standard does not purport to address all of the
cluding filled and reinforced compounds in addition to unfilled
safety concerns, if any, associated with its use. It is the
types; rigid thermoplastics sheets;
responsibility of the user of this standard to establish appro-
1.3.2 Thermosetting molding materials, including filled and
priate safety and health practices and determine the applica-
reinforced compounds; thermosetting sheets, including lami-
bility of regulatory limitations prior to use.
nates; and
1.3.3 Thermotropic liquid-crystal polymers.
2. Referenced Documents
1.4 The procedure is not normally suitable for use with rigid
2.1 ASTM Standards:
cellular materials and sandwich structures containing cellular
D 790 Test Methods for Flexural Properties of Unreinforced
material.
and Reinforced Plastics and Electrical Insulating Materi-
2
NOTE 1—For certain types of textile-fiber-reinforced plastics, a four-
als
point bending test is preferred. This is currently under consideration in
D 5936 Specification for Multipurpose Test Specimens
ISO.
3
Used for Testing Plastics
1.5 The procedure is performed using specimens that may
D 5939 Practice for Preparing Multipurpose Test Specimens
3
be either molded to the chosen dimensions, machined from the
and Bars of Thermoplastics by Injection Moulding
central portion of a standard multipurpose test specimen (see
D 5940 Practice for Preparing Small Plate Test Specimens
3
ISO 3167 (Specification D 5936)), or machined from finished
of Thermoplastics by Injection Moulding
4
and semi-finished products such as moldings, laminates, and
2.2 ISO Standards:
extruded or cast sheet.
ISO 178 Determination of Flexural Properties
1.6 The procedure specifies preferred dimensions for the
ISO 291:1977 Plastics—Standard Atmospheres for Condi-
test specimen. Tests that are conducted on specimens of
tioning and Testing
different dimensions, or on specimens that are prepared under
ISO 293:1986 Plastics—Compression Moulding Test Speci-
different conditions, may produce results that are not compa-
mens of Thermoplastic Materials
rable. Other factors, such as the speed of testing and condi-
ISO 294 Plastics—Injection Moulding of Test Specimens of
tioning of the specimens, can also influence the results.
Thermoplastic Materials
Consequently, when comparative data are required, these
ISO 295:1991 Plastics—Compression Moulding of Test
1 2
Bias This test method is under the jurisdiction of ASTM Committee D-20 on Annual Book of ASTM Standards, Vol 08.01.
3
Plastics and is the direct responsibility of Subcommittee D20.61 on USA Technical Annual Book of ASTM Standards, Vol
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