■Overview of compression set importance:

The compression set refers to the degree of compression set, as shown in following figure:

Calculation of compression set:

Lower compression value means better elasticity and better sealing performance of the material, while higher compression value means worse sealing performance.

■diams; the compression set property of KTseal(Fluro Seal) FFKM is better than FFKM of other brands:

Therefore, considering the balance of chemical resistance, heat resistance, compression set and properties of finished product, FFKM should be the better choice than the perfluoro elastomer if there isn’t especially strict requirement of chemical resistance.