The characteristics of electrical graphite created during the graphitizing process can be modified with precision through impregnation with different impregnation media. Material such as plastics, metals, salts or carbon itself are suitable for filling the porous system created during graphitizing. In addition to tailored modification of electrical and mechanical characteristics, numerous other characteristics can be adapted to suit the respective application. Oxidation resistance can thus be increased, wear resistance improved and thermal conductivity influenced. Improved spark suppression can also be achieved, along with reduction in noise emissions (e.g. with carbon brushes).

A broad range of impregnation media is available for this purpose:

• Artificial resins (mainly duromer resins such as phenolic, furan, epoxy and acrylic resins)
• Metal and metal alloys (mainly antimony, bronzes and silicon)
• Hydrocarbons such as oils, paraffins, waxes or grease
• Salts and salt solutions