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REPCO INC 6 Eves Drive Marlton NJ 08053 Ph 8567620172 TF 8008229190 FAX 8567620184 Email salesrepcoinccom Website wwwrepcoinccom GRADE TYPE KEY CG Carbon Graphite EG Electrographitic G Graphite MG Metal Graphite CARBONGRAPHITE BRUSHES made their en trance early in the brush industry Their properties o high hardness material strength and pronounced cleaning action usually give long brush lie under severe operating conditions although they may not commutate as well as those with soter grades These grades are limited to lower current densi ties and are used on slower machines particularly those with fush mica commutators The high riction generated with this type o material also makes it unattractive or some modern day applications ELECTROGRAPHITIC BRUSHES are baked at temperatures in excess o 2400C This process physically gives the material more o a graphitic structure They generally have good commutat ing characteristics but may not always be used because o high currents or severe mechanical or atmospheric conditions This material is airly porous which permits treatment with organic resins The treatments increase strength and lubricating ability which in turn helps increase brush lie These brushes are generally ree rom abrasive ash METAL GRAPHITE BRUSHES are generally made rom natural graphite and x1nely divided metal powders Copper is the most common metallic constituent but tin silver and lead are also used This material is ideal or a variety o applications because o its low resistivity Metal graphites are used on commutators o plating generators and wound rotor induction motors where low voltage and high brush current densities are encountered They are also used or grounding brushes because o their low contact drop These brushes exhibit a dex1nite polishing action GRAPHITE BRUSHES are composed o natural or artix1cial graphite bonded with resin or pitch to orm a sot brush material Natural graphite usually contains ash which gives the brush an abrasive cleaning action The ast x1lming properties o these brushes is benex1cial in protecting the commuta tor or slip ring during operation in contaminated atmospheres Their low porosity is also valuable in reducing commutator threading They are not capable however o sustained operation at high currents like electrographitic materials GRADE APPLICATION SUMMARY CARBONGRAPHITE ELECTROGRAPHITIC METAL GRAPHITE GRAPHITE Used on older machines High strength and hardness Low resistance poor commutation For machines that require some polishing action Generally slower speed machines cranes hoists elevators welders Good x1lm characteristics Smooth ride Reduces threading Thermally limited Generally used on slip rings FHP motors Good or current densities Low contact drop Polishing action Metal content application 50 material handling battery charging welding generators 60 plating generators rings 75 up rings grounding brushes Good commutating ability Adequate strength with low abrasiveness Good riction characteristics Versatile Resistance strength hardness and den sity can be controlled through raw material combinations Very widely used today in all types o motors generators for steel and paper mills excavation cement transportation aerospace 45