Standard Practice for
Plastics: Dynamic Mechanical Properties: Determination and
Report of Procedures 1

This standard is issued under the fixed designation D 4065; 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.

This standard has been approved for use by agencies of the Department of Defense.

1. Scope*

1.1 This practice is for general use in gathering and reporting dynamic mechanical data. It incorporates laboratory practice for determining dynamic mechanical properties of specimens subjected to various oscillatory deformations on a variety
of instruments of the type commonly called dynamic mechanical analyzers or dynamic thermomechanical analyzers.

1.2 This practice is intended to provide means of determining the transition temperatures, elastic, and loss moduli of
plastics over a range of temperatures, frequencies, or time, by
free vibration and resonant or nonresonant forced vibration
techniques. Plots of elastic and loss moduli are indicative of the
viscoelastic characteristics of a plastic. These moduli are
functions of temperature or frequency in plastics, and change
rapidly at particular temperatures or frequencies. The regions
of rapid moduli change are normally referred to as transition
regions.

1.3 The practice is primarily useful when conducted over a
range of temperatures from −160°C to polymer degradation
and is valid for frequencies from 0.01 to 1000 Hz.

1.4 This practice is intended for materials that have an
elastic modulus in the range from 0.5 MPa to 100 GPa (73 psi
to 1.5 3 107 psi).

1.5 Apparent discrepancies may arise in results obtained
under differing experimental conditions. Without changing the
observed data, reporting in full (as described in this practice)
the conditions under which the data were obtained will enable
apparent differences observed in another study to be reconciled.

1.6 Test data obtained by this practice are relevant and
appropriate for use in engineering design.

1.7 The values stated in SI units are to be regarded as the
standard. The values given in parentheses are for information
only.

1.8 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the

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