Back-up Rings are as standard manufactured from virgin PTFE. In view of the unfavourable cold flow behaviour of virgin PTFE, these Back-up Rings are used only for low to medium loads. For higher load requirements, filled PTFE materials (with glassfibre, bronze, carbon, etc.) have to be used. For sealing against high pressures, Back-up Rings made from specially modified thermoplastic materials are used.For the series production of larger quantities, injection moulded Back-up Rings can be manufactured, e.g. NBR 90 Shore A, FKM90 Shore A, or thermoplastic elastomers (TPE) on request.
· Static applications: Up to approx. 250 MPa depending on the Back-up Ring
· Dynamic applications: Reciprocating up to approx. 40 MPa
· Oscillating/slowly rotating up to approx. 15 MPa
· Speed: Reciprocating or rotating up to approx. 2 m/s depending on the material Operating temperature: - 200 °C to + 260 °C depending on the material