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Stifness

Stiffness

General information

The high level of variation that can be achieved in polyurethane chemistry makes it possible to produce Desmopan® with a very wide range of Young’s moduli.

The range up to 1000 MPa is covered by non-reinforced grades. Reinforced Thermoplastic Polyurethanes grades (brand name: Desmovit) can attain considerably higher moduli.

The graphic shows the Young’s modulus range for Thermoplastic Polyurethanes and RTPU compared to the range for other materials.

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Young’s modulus (modulus of elasticity) is established from the tensile test to DIN 53504 on an S1 specimen to DIN EN ISO 3167, employing a testing rate of 2 mm/min. Young’s modulus is calculated as the ratio of stress to strain from the initial gradient of the stress-strain curve.

In the case of plastics, Young’s modulus has been seen to be dependent on the following parameters:

  • Orientation of the macromolecules and fillers
  • Temperature
  • Moisture content
  • Stressing rate and duration
  • Specimen geometry
  • Test setup

Stiffness as a function of temperature

The dependence on temperature is shown in the following diagrams on the basis of different raw materials and hardnesses.

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