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ifriction.com comments: Used in calcined form. Obtained from sludge collected from oil refinery retorts. Probably similar to the old 'gas coke' or 'gas carbon' obtained from coal gas retorts. Low ash content - less than 1%. High carbon content. Can be found in many graphite blends, so be careful when buying graphite, you may be getting a lot of coke. Like graphite it lowers friction level. Suggestions it can help in reducing early morning sharpness! Low specific gravity. Another case of a little going a long way. Can be a cost effective ingredient. Using petroleum coke is a cheap way to put some of the advantages of carbon brakes into a formula. Reasonable heat stable. |