Carbon / Graphite

A common seal face material that is chemically inert to most fluids, with the exception of oxidizers, bleaches and halogens.

80% carbon and 20% graphite is a very popular mixture for the seal face we use in mechanical seals. The graphite is the part of the combination that is providing the lubrication when needed. Graphite has a laminar structure, so it makes a good dry lubricant.

Carbon has a hard crystal structure and adds strength to the compound.

In practice, the graphite releases from the compound and deposits its self on the hard seal face. This is the black wear track we commonly see on the hard face.

The graphite releases only in the presence of moisture. This can be a problem in some dry running applications.




  • On February 15, 2018