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Bronze Kopper (Composite Piston Seal – PTFE/Bronze + Energiser)

Composite piston seal using a PTFE slide ring filled with bronze for low friction and wear resistance, energised by an elastomer O-ring to maintain sealing force. Commonly used in precision piston glands for high-pressure hydraulic cylinders.

Poly Kopper (Composite Piston Seal – Polyurethane Ring + Energiser)

Composite piston seal with an engineered polyurethane slide ring, energised by an elastomer O-ring. Selected where you want composite-style performance (low friction / stable sealing) but with a polyurethane ring construction for easy installation.

Z-Split Kopper (Split Composite Piston Seal – Easy Fit)

Composite piston “kopper” seal supplied with a Z-cut / split slide ring for easy installation on one-piece pistons (maintenance-friendly), still using an energiser O-ring to apply sealing load. Often specified for high-pressure piston sealing depending on gland design.

SPGW 4-Piece Kopper (Heavy-Duty Compact Piston Seal Set)

A 4-piece, double-acting compact piston seal set typically consisting of a PTFE/bronze friction ring, an NBR energiser, and two thermoplastic back-up/retaining rings to improve extrusion resistance and stability in heavy-duty hydraulic service.