PTFE back-up ring BB

Description The Back-up ring BB is a closed solid-profile support ring with a concave groove designed to back O-rings in split grooves. Its concave geometry ensures excellent O-ring support under very high and pulsating pressures. Machined from virgin PTFE; also available as PTFE with fillers. Installation-friendly shape allows use in split grooves, but the groove width must be increased 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 extrusion in gaps and clearances

Materials PTFE; PTFE with filler materials

Technical values

• Materials: PTFE
• Pressure: static up to 250 MPa; linear up to 40 MPa; rotary up to 15 MPa
• Temperature: -200°C to +260°C (material dependent)
• Speed: linear up to 0.5 m/s; rotary up to 2 m/s

Features / technical specifications

• Closed profile with a concave groove suitable for split grooves
• Excellent O-ring support under high and pulsating pressures due to concave design
• Turned from virgin PTFE
• Also available in PTFE with fillers
• Required groove width increases by the Back-up ring thickness
• Applicable in static, dynamic, single acting, double acting, linear, rotating and oscillating systems