Carbon Physicals


The people that make the carbon-graphite compounds we use in seal faces are very proud of their products and are eager to give you as much information about them as than can.

They mold the carbon-graphite faces and then impregnate them to get the various grades.

Here is a carbon-graphite face with three impregnations

  • The first impregnation “C” is 1inch (25 mm)
  • The second impregnation “B” goes in about 0.125 inches (3 mm)
  • The third impregnation goes in about 0.020 inches (0.5 mm)

The carbon / graphite manufacturers publish charts that show the strength, conductivity, temperature limits, etc. of the various grades. This chart is a description of the physicals for the Pure Carbon company grades.

Similar charts are available from other carbon companies.



  • On February 15, 2018