Dynamic Mechanical Thermal Analysis (DMTA) ISO 4664-1

DMTA (Dynamic Mechanical Thermal Analysis) can determine the visco-elastic behaviour of rubber materials in a vulcanised state under various elongation, compression or shearing rates, different frequencies and/or temperatures. The machine measures amongst other things the storage and loss moduli and the resulting tan δ: ratio of loss to storage modulus.

 

DMTA can be used to measure:

  1.  Low-temperature behaviour: a dynamic test over a specified temperature range yields a tan d curve; the peak in this curve is an indication of the glass transition temperature of the material under the applied test conditions. That makes it easier to estimate whether the material will still be rubbery and so for instance retain its sealing properties.
  2. WLF mastercurve determination: sometimes rubber properties have to be predicted, e.g. at frequencies that cannot be measured. A WLF master curve determination ( temperature-frequency sweep) allows for this to be extrapolated to high frequencies.

The test is carried out according to ISO standard 4664-1 unless otherwise desired.

 

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