ST-type Gely ring Purpose: it is used for sealing of piston in reciprocating HP oil cylinger .combined used with O-type ring. (seal for HP oil cylinder and piston) Scope: various engineering machineries,general machineries hydraulic oil cylinder Material: compound material of PTFE and Bronze Hareness: 92±5 Working temperature:-40~200°C(it decide by the O-type ring material) Working pressure: ≦40Mpa bast60MPa Working medium: hydraulicoil, water,emulsion Movement speed: ≦4m/s