PTFE Backup Rings

KOK PTFE backup rings are designed to prevent extrusion of elastomeric seals in high-pressure hydraulic systems.

Used in combination with O-rings or other sealing elements, backup rings provide dimensional stability under pressure spikes and reduce the risk of seal damage.

Performance Characteristics

• High extrusion resistance
• Low friction coefficient
• Excellent compatibility with mineral oils, water-glycol fluids, and many industrial media
• Suitable for high-pressure applications (depending on system design)
• Available in metric and imperial sizes.

Material Options

• Virgin PTFE
• PTFE + Glass Fiber
• PTFE + Graphite
• PTFE + GF + MoS₂

Typical size range: 6 mm – 230 mm

Primary applications: Hydraulic pistons, shock absorbers