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Graphite Seals

Graphite seals, are softer and relatively weak because of the crystalline order and closer spacing between the monoplanes and stacks. A graphite structure can be compared to a deck of cards with individual layers able to easily slide off the deck. This phenomenon gives the material a self lubricating ability which is matched by no other material. External lubricants are simply not necessary.graphite seal


It is possible to combine amorphous carbon and graphite to take full advantage of the strengths and weaknesses of each of these two types of carbon, table 1. The proper mixture of the two materials is strong and hard and has low friction. At the same time, this composite has excellent corrosion resistance and is capable of operating at temperatures in excess of 315°C for extended periods of time, depending on the specific grade. The ability to create materials that have these properties is the basis of the manufactured mechanical carbon materials that perform well in difficult tribological situations such as pumps.

Properties of typical carbon and graphite materials

  Carbon 100% Carbon-graphite (70%-30%) Carbon-graphite (30%-70%) Graphite 100%
Apparent density ( 1.70 1.72 1.75 1.80
Hardness 100 85 65 40
Compressive strength (MNm-2) 300 208 145 55
Flexural strength (MNm-2) 62 62 52 28
Modulus of elasticity (GNm-2) 21 17 14 10
Thermal conductivity (W/m.°C) 5 9 12 85
Temp limit in air (°C) 315 315 315 455

How to process carbon graphite

Chinatungsten Online can supply customers not only standard carbon graphite seals, but also special specifications like the products showing as following

seal drawing

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1.Tungsten Carbide
2.Tungsten carbide Bar
3.Tungsten carbide Rod
4.Tungsten Carbide Nozzle
5.Tungsten Carbide Button
6.Tungsten Carbide Inserts

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