Precision back-up ring BC

PTFE

Product description
The Back-up Ring BC features a slotted profile with a concave groove designed to support O-rings under very high and pulsating pressures. Its slotted geometry offers easy assembly and is suitable for closed grooves and diverse installation conditions.

Design and mounting
Back-up Rings are turned from virgin PTFE or PTFE with fillers and machined to match the groove height precisely. Installing a Back-up Ring increases the required groove width by the ring thickness; ensure groove dimensions account for this change.

Fields of application

• static
• dynamic
• single acting
• double acting
• linear motion
• rotating shafts
• oscillating movements

Main use
Protects elastomeric seal elements from gap extrusion and provides axial support to O-rings under high and pulsating pressures.

Materials
PTFE (virgin) or PTFE with filler materials.

Technical values

• 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

Characteristics / technical specifications

• Material: PTFE (virgin) or PTFE with filler
• Profile: slotted with concave groove
• Manufacturing: turned to match groove height
• Groove impact: required groove width increases by the Back-up Ring width
• Primary function: support O-rings at very high and pulsating pressures; prevent elastomer extrusion
• 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
• Suitable for: static/dynamic, single/double acting, linear, rotating and oscillating applications