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ifriction.com comments: Specific gravity 8.9, Moh hardness 2.5. Increases effectiveness. Good thermal conductor which can conduct heat away from friction surface into the friction material itself. This can have both desirable and undesirable effects. Beware. Too much copper in a formula causes wear - opposing surface wear! Probably because of the copper oxide formed. In Europe and Japan it is common to use large quantities of copper, or brass powders and particles in disc brake pads where high temperatures are generated. Such formulas can be almost semi-metallic. High metallic contents raise thermal conductivity and this affects not only performance characteristics but processing conditions like press curing and baking. |