This test method outlines the use of dynamic mechanical
instrumentation for determining and reporting the visco-elastic
properties of thermoplastic and thermosetting resins and composite
systems in the form of rectangular bars molded directly or cut from
sheets, plates, or molded shapes. The data generated, using
three-point bending techniques, may be used to identify the
thermomechanical properties of a plastic material or compositions
using a variety of dynamic mechanical instruments.
This test method is intended to provide means for determining
the viscoelastic properties of a wide variety of plastics materials
using nonresonant, forced-vibration techniques in accordance with
Practice D4065. Plots of the elastic (storage) modulus; loss
(viscous) modulus; complex modulus and tan delta as a function of
frequency, time, or temperature are indicative of significant
transitions in the thermomechanical performance of polymeric
This test method is valid for a wide range of frequencies,
typically from 0.01 to 100 Hz.
Apparent discrepancies may arise in results obtained under
differing experimental conditions. These apparent differences from
results observed in another study can usually be reconciled,
without changing the observed data, by reporting in full (as
described in this test method) the conditions under which the data
Due to possible instrumentation compliance, the data generated
are intended to indicate relative and not necessarily absolute
Test data obtained by this test method are relevant and
appropriate for use in engineering design.
The values stated in SI units are to be regarded as the
standard. The values given in parentheses are for information
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-This test method is equivalent to ISO 6721, Part 5.
*A Summary of Changes section appears at the end of this
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