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ASTM D 790 Document Information:
Title
Standard Test Methods for Flexural Properties of Unreinforced and Reinforced Plastics and Electrical Insulating Materials
ASTM International
Publication Date:
Sep 1, 2007
Scope:
These test methods cover the determination of flexural
properties of unreinforced and reinforced plastics, including
high-modulus composites and electrical insulating materials in the
form of rectangular bars molded directly or cut from sheets,
plates, or molded shapes. These test methods are generally
applicable to both rigid and semirigid materials. However, flexural
strength cannot be determined for those materials that do not break
or that do not fail in the outer surface of the test specimen
within the 5.0 % strain limit of these test methods. These test
methods utilize a three-point loading system applied to a simply
supported beam. A four-point loading system method can be found in
Test Method D 6272.
Procedure A, designed principally for materials that
break at comparatively small deflections.
Procedure B, designed particularly for those materials
that undergo large deflections during testing.
Procedure A shall be used for measurement of flexural
properties, particularly flexural modulus, unless the material
specification states otherwise. Procedure B may be used for
measurement of flexural strength only. Tangent modulus data
obtained by Procedure A tends to exhibit lower standard deviations
than comparable data obtained by means of Procedure B.
Comparative tests may be run in accordance with either
procedure, provided that the procedure is found satisfactory for
the material being tested.
The values stated in SI units are to be regarded as the
standard. The values provided in parentheses are for information
only.
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 - These test methods are not technically equivalent to
ISO 178.
A Summary of Changes section appears at the end of this
standard.
Keywords:
- flexural properties
- plastics
- stiffness
- strength
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