PTFE back-up ring BU

Description The Back-up Ring BU features a closed rectangular profile and, due to its accessibility, is particularly suitable for split grooves. Back-up rings are manufactured to match the groove height and are machined from virgin PTFE. The required groove width increases by the thickness of the back-up ring.

Fields of application

• static
• dynamic
• single acting
• double acting
• linear
• rotating
• oscillating

Main use Protective element for elastomeric seals against gap extrusion

Materials PTFE; PTFE with fillers

Technical values

• Materials: PTFE
• Pressure: static up to 250 MPa; linear up to 40 MPa; rotary up to 15 MPa
• Temperature: -200°C / +260°C (material dependent)
• Speed: linear up to 0.5 m/s; rotary up to 2 m/s
• Note: Maximum values (temperature, speed and pressure) are not simultaneously applicable and vary depending on material and media.

Technical specifications

• Denomination: Back-up Ring BU (unslotted)
• Main use: Protective element for elastomeric seals against gap extrusion
• Materials: PTFE; PTFE with fillers
• Pressure ratings: static up to 250 MPa; linear up to 40 MPa; rotary up to 15 MPa
• Temperature range: -200°C to +260°C (material dependent)
• Speed limits: linear up to 0.5 m/s; rotary up to 2 m/s
• Installation note: Back-up rings are matched to groove height; required groove width increases by the ring thickness