Product Description Feature: Single Unbalanced Mechanical Seal Item No.: OY-H12 (Equivalent to Burgmann H12N) Operating Conditions: Pressure: Up to 25bar or 360psi Speed: Up to 15m/s or 49ft/s Temperature: -40 to 230 centigrade degree (depending on materials used) To ISO 3069 and DIN 24960 Material: Seal face/Primary ring: Carbon graphite, Silicon carbide, Tungsten carbide. Seat/Mating ring: Alumina ceramic, Silicon carbide, Tungsten carbide. Secondary seals: NBR, Viton, EPDM, PTFE Spring and others: SUS304, SUS316, etc Shaft Size: 14mm to 80mm