Elastomers 2 are widely used in sealing technology due to their thermal and chemical resistance but have been replaced in many applications by today`s polyurethane materials. Nevertheless, they will maintain to play an important role in the sealing industry and remain to be the only solution for many applications. Seals made of rubber elastomers are mainly used as rod and piston U-rings, compact seals, O-rings, and as preloading elements in composite seals.