Rod seals are used in hydraulic cylinders for fluid sealing. They are external to the cylinder head and seal against the cylinderâ??s rod, preventing leakage of fluid from within the cylinder to the outside. â?? â?? Seal Materials (PTFE Grades): BR40, BR40M5, BR55M5, GL5M5, GL15M5. Temperature Range: -50�°C + 200�°C (Depend upon O ring material) Operating Pressure: Up to 800 bar (80Mpa) O Ring material: Nitrile Rubber, Viton. Seal Profile Size Range: We manufacture ROD (Step) Seals for the following range of Piston ROD diameter - 4mm to 700 mm