The static seal Accostatic is made of very wear restistent polyurethane. The profile of the static seals guarantees a simple and easy mounting. The polyurethane material gives an essentially higher extrusion resistance compared to a standard O-ring.
There is no need of a back-up ring here, as you have two parts in one.

Special Features:
Very high resistance of extrusion
Low pressure-set
High wear resistance
Low costs of groove geometry
Economic constructions
Resistance to twisting
Small mounting area
Simple mounting