Graphite Sealing Ring – An Essential Part for Extending the Lifespan of Mechanical Equipment Seal Parts

  • Low coefficient of thermal expansion and low friction coefficient.
  • Excellent self-lubrication.
  • High thermal conductivity and thermal stability.
  • Excellent sealing performance and machinability.
  • Good corrosion resistance and oxidization resistance.
An integral type and split type graphite sealing rings are placed together.

Graphite sealing ring is a component used for mechanical seals. Its high strength, low friction, high temperature and high pressure resistance and self-lubrication make it an ideal choice for dynamic and static sealing ring materials. It is made from high purity graphite or impregnated resin/metal graphite to achieve superior performance.

Graphite sealing rings are divided into static and dynamic sealing rings, with static sealing rings installed on fixed components and dynamic sealing rings installed on rotating shafts. These sealing rings are usually used in applications such as pumps, compressors, and turbines to form a sealing interface that prevents liquid or gas leakage. Therefore, it puts high requirements on the performance of sealing rings, including strength, hardness, porosity, lubrication, and heat resistance.

  • Self-lubrication, low friction.
  • High tensile strength and good thermal shock resistance.
  • High conductivity, low coefficient of thermal expansion.
  • Good chemical & corrosion resistance.
  • Excellent high temperature stability.
Table 1: Specifications of Graphite Sealing Ring
Grade Density (g/cc) Porosity Shore Hardness Compressive Strength (Mpa) Flexural Strength (Mpa) CTE (×10-6°C-1) Max Working Temperature Application
M105K(Resin Impregnation Vanes) 1.8 2% 60 110 65 200 °C Carbon vanes
M106K(Resin Impregnation) 1.8 2% 65 180 60 4 200 °C Seal rings, bush
M106D(Antimony Impregnation) 2.3 3% 80 230 80 4 550 °C Seal rings, bush
M254A(Copper Impregnation) 2.4 2.5% 70 170 65 500 °C Seal rings, bush
  • 1 MPa = 10.2 kgf/cm2; 1 W/m.k = 0.86 kcal/cm.h.°C
  • These properties are typical values and not guaranteed.