Media restistance

Short-term tests (up to 24 hours) are carried out with liquids that usually only act on plastic components for a short time, such as coffee, cola, cleaning agents or cream. Storage can take place at 23°C or at higher temperatures (up to 100°C).

For many applications, the long-term stability of plastics against attack by process agents is a quality criterion. Car manufacturers, such as VW (VW 50133 or TL 52682) or Daimler (DBL 5406, DBL 5408), prescribe heat storage in engine oil or glycol mixtures.

Testing is always carried out in accordance with the specifications. In most cases, mechanical tests or visual assessments are carried out after the components have aged. 

In the stress crack test (DIN EN ISO 22088-3; bending strip method), the plastic samples are subjected to a constant bending stress in addition to the chemical stress caused by operating materials. The test matrices must be selected according to the specified edge fiber elongation and wall thickness.