The various parts of ISO 6721 specify methods for the determination of the dynamic mechanical properties of
rigid plastics within the region of linear viscoelastic behaviour. This part of ISO 6721 is an introductory section
which includes the definitions and all aspects that are common to the individual test methods described in the
subsequent parts.
Different deformation modes may produce results that are not directly comparable. For example, tensile
vibration results in a stress which is uniform across the whole thickness of the specimen, whereas flexural
measurements are influenced preferentially by the properties of the surface regions of the specimen.
Values derived from flexural-test data will be comparable to those derived from tensile-test data only at strain
levels where the stress-strain relationship is linear and for specimens which have a homogeneous structure.
BS EN ISO 6721-1:2011 Referenced Document
ISO 1268 Plastics; Preparation of glass fibre reinforced, resin bonded, low-pressure laminated plates or panels for test purposes
ISO 2818 Plastics — Preparation of test specimens by machining*， 2018-12-13 Update
ISO 291 Plastics - Standard atmospheres for conditioning and testing
ISO 293 Plastics — Compression moulding of test specimens of thermoplastic materials*， 2023-02-21 Update
ISO 294 Plastics - Injection moulding of test specimens of thermoplastic materials
ISO 295 Plastics - Compression moulding of test specimens of thermosetting materials
ISO 4593 Plastics; film and sheeting; determination of thickness by mechanical scanning
ISO 6721-2:2008 Plastics - Determination of dynamic mechanical properties - Part 2: Torsion-pendulum method
ISO 6721-3 Plastics - Determination of dynamic mechanical properties - Part 3: Flexural vibration - Resonance-curve method*， 2021-01-31 Update
BS EN ISO 6721-1:2011 history
1970BS EN ISO 6721-1:2019 Plastics. Determination of dynamic mechanical properties. General principles
2011BS EN ISO 6721-1:2011 Plastics. Determination of dynamic mechanical properties. General principles