Testing Material Behaviour
Immersion tests are performed to ensure the functional behaviour of rubber materials or elastomer seals with respect to different operating materials. In the course of this the following information as result is obtained:
- impact by swelling (increase or decrease of volume)
- change in hardness (embrittlement or softening)
- change of the network structure of the material as the result of a chemical attack
The following benchmarks for sealing applications are recommended:
- for static applications the change in volume should not exceed –5 to +25%
- for dynamic applications the change in volume should not exceed –5 to +10%
- the change in tensile strength and in elongation at break should not be higher than after an artificial storage in air with the same time/temperature conditions as the storage in medium
Standards: DIN ISO 1817, ISO 1817, VDA 675 301, VDA 675 302, VDA 675 303, VDA 675 304 and VDA 675 305