wiper seals are designed to exclude dirt and abrasive foreign material for protecting seals on hardware and pneumatic assemblies.

　　Contamination particles in the hydraulic system is the most common reason for breakdowns and short service life of seals. A major part of the particles reaches the system through the rod. The wiper seal's task is to prevent this.

　　The wiper seal is the most undervalued seal type in the hydraulic cylinder in relation to its important function. The choice of wiper seal should, however, be founded on as carefully drawn-up requirement specifications as the choice of piston and rod seals. The surrounding environment and service conditions must be taken into special consideration.

　　The wiper seal must be designed not only to fit the rod (dynamic function) but also to seal in the housing (static function).