This part of ISO 6721 specifies two methods (A and B) for determining the linear dynamic mechanical
properties of plastics, i.e. the storage and loss components of the torsional modulus, as a function of
temperature, for small deformations within the frequency range from 0,1 Hz to 10 Hz.
The temperature dependence of these properties, measured over a sufficiently broad range of temperatures
(for example from −50 °C to +150 °C for the majority of commercially available plastics), gives information on
the transition regions (for example the glass transition and the melting transition) of the polymer. It also
provides information concerning the onset of plastic flow. The two methods described are not applicable to
non-symmetrical laminates (see ISO 6721-3, Plastics — Determination of dynamic mechanical properties —
Part 3: Flexural vibration — Resonance-curve method). The methods are not suitable for testing rubbers, for
which the user is referred to ISO 4664-2, Rubber, vulcanized or thermoplastic — Determination of dynamic
properties — Part 2: Torsion pendulum methods at low frequencies.
EN ISO 6721-2:2008 Referenced Document
ISO 6721-1:2001 Plastics - Determination of dynamic mechanical properties - Part 1: General principles
EN ISO 6721-2:2008 history
2019EN ISO 6721-2:2019 Plastics - Determination of dynamic mechanical properties - Part 2: Torsion-pendulum method (ISO 6721-2:2019)
2008EN ISO 6721-2:2008 Plastics - Determination of dynamic mechanical properties - Part 2: Torsion-pendulum method
1996EN ISO 6721-2:1996 Plastics - Determination of Dynamic Mechanical Properties - Part 2: Torsion-Pendulum Method (ISO 6721-2 : 1994, Including Technical Corrigendum 1: 1995)