Features: 1) Working conditions: pumps: centrifugal pumps, pipe pumps, ordinary industrial pumps 2) Temperature: -20 ~ 110°C, 3) Pressure: ≤0.8MPa, 4) Speed: ≤10m/s 5) Combined material: a) Stationary ring (ceramic/SiC/TC), b) Rotary ring (carbon/SiC/TC), c) Secondary seal (NBR/EPDM/Viton), d) Spring and punched parts (steel)