TSSR meter
Temperature Scanning Stress Relaxation

TSSR meter

TSSR meter (TSSR = Temperature Scanning Stress Relaxation) measures the thermo-mechanical properties of elastomers and polymers subjected to a constant stress at a constantly rising temperature.

The measuring system is housed in a sturdy cast iron case. The specimen, a type 5 A standard bar is fixed in a running traverse, driven by a linear lifting motor and is stretched at a temperature of 23°C by 50 % of its original length.

The anisothermal stress relaxation test (AISR) is a new test method for characterizing the thermo-mechanical properties of elastomers and polymers. It consists in subjecting a test specimen to a constant tensile stress at a constantly rising temperature. The stress relaxation is measured as a function of time and is recorded and evaluated.

The AISR test method, originally developed for determining the upper service temperature and relaxation spectrum of thermoplastic elastomers (TPE), has proven to be perfectly suited for testing conventional elastomers and polymers as well.

In contrast to conventional relaxation tests carried out at a constant temperature, the temperature in the AISR test rises continuously at a defined heating rate, allowing the determination of the maximum service temperature and relaxation spectrum of the sample material. The measuring data supply reliable information about the phase morphology of the tested material.