This practice is for general use in gathering and reporting
dynamic mechanical data. It incorporates laboratory practice for
determining dynamic mechanical properties of plastic specimens
subjected to various oscillatory deformations on a variety of
instruments of the type commonly called dynamic mechanical
analyzers or dynamic thermomechanical analyzers.
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.
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.
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 ×
Discrepancies in results are known to arise when 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. An
assumption of this technique is that testing is conducted in the
region of linear viscoelastic behavior.
Different modes of deformation, such as tensile, bending and
shear, are used, as listed in the referenced test methods.
Test data obtained by this practice are relevant and appropriate
for use in engineering design.
The values stated in SI units are to be regarded as standard.
The values given 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 practice to establish appropriate safety and
health practices and determine the applicability of regulatory
limitations prior to use. Specific hazards statements are
given in Section 8.
NOTE 1—This practice is equivalent to ISO 6721–1.
*A Summary of Changes section appears at the end of this