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Lionpak® graphite moulded rings

Graphite moulded rings with outstanding qualities.

  • Shell MESC
  • Valves

Lionpak graphite moulded rings are high-efficiency, moulded graphite sealing rings, produced to precise density and size.

They are manufactured from expanded high purity flexible graphite foil with an oxidation inhibitor. They do not contain binders, elastomers or fillers.

The difference between the three model numbers is the purity of the graphite foil from which the rings are manufactured.

  • Outstanding sealing performance over long adjustment-free periods
  • Excellent chemical resistance
  • Very wide temperature range

Valves and rotary equipment handling virtually any media. These rings are ideal for duties with high-temperature steam, demineralised water, heat transfer media, petroleum products, inorganic and organic acids, alkalis, hot waxes and oils.

Valve stem duties

  • Maximum operating temperature in steam: +650°C (+1202°F)
  • Maximum operating temperature in oxidising conditions: +500°C (+932°F)
  • Maximum operating temperature in non-oxidising conditions: +1000°C (+1832°F)
  • Minimum operating temperature: -200°C (-328°F)
  • Maximum system pressure: 25 MPa/250 bar (3626 psi)

Certain rotary equipment

  • Dependant on application, please contact James Walker for further details for rotary duties

Recommended ring densities

  • For valve stem duties: 1.6 g/cm3 (SG 1.6)
  • For rotary duties: 1.5 g/cm3 (SG 1.5)
  • For special applications: mixture of ring densities

  • Compatible with media in the range pH 0 -14
  • Sulphur content (typical): ≤ 300 ppm
  • No loss of volatiles at high temperature
  • Lower limiting temperatures apply when used with oxidising agents, e.g. nitric acid
  • Thermal conductivity, ring of density 1.4 g/cm3: (SG 1.4): axial: 400 W/mK; radial: 6 W/mK
  • Coefficient of friction to steel: 0.05

  • Precision moulded rings in endless form, or with single split or matched scarf-split halves. Sections 1.5 mm to 40 mm (1/16" to 19/16"); diameters 2 mm to 1200 mm (or 3/32" to 47 1/4")

Related Downloads

Compression packing fitting guide

English pdf (502 KB) Download

Lionpak 5501 datasheet

English pdf (432 KB) Download

Lionpak 5503 datasheet

English pdf (432 KB) Download

Lionpak 5504 datasheet

English pdf (432 KB) Download

Compression packing guide

Our constant advances in materials and lubricants, product design and manufacturing techniques, keep us at the forefront of compression packing technology. We therefore bring you one of the widest ranges of packings to match the temperatures, pressures and speeds of your most modern fluid handling systems, and economical packings for your older plant.

Find out more
Compression packing guide

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