Carbon Brush Grades
- HARD CARBON BRUSHES
- CARBON-GRAPHITE BRUSHES
- ELECTRO-GRAPHITE BRUSHES
- METAL-GRAPHITE BRUSHES
- RESIN-GRAPHITE BONDED BRUSHES
There are five main groups of raw materials used in manufacturing process:
Electro-graphite is the most common of motor brush materials. The composition of carbon, graphite and appropriate binders provides for better commutation for industrial motors and generators than any other customarily used in motor brushes. Electro-graphite grades as a rule are harder, denser and have a longer brush life than the carbon-graphite series.
Carbon-graphite materials contain various proportions of carbon and graphite mixed with a binder, usually coal tar pitch, moulded under pressure and baked or sintered. Graphite-carbon is a variant of this, used when graphite predominates the consumption. These materials are relatively strong and are higher in friction and abrasiveness then electro-graphite materials.
Graphite brushes contain graphite in a powder form, which is mixed with a binder and heated. Variations in processing make it a possible to offer graphite materials with a wide variety of properties. In general, graphite brushes have comparatively low resistance and friction and are used primarily on low-voltage motors, generators and on slip-rings.
Metal grades are composed of more than 75% metal, principally copper or alloys of copper. The metal most frequently used is electrolytic copper. For certain applications also silver, tin, lead and other metal powders are used. They are used on some types of slip-rings and also in plating generators, annealers, continuous welding machines and other applications where a large amount of current must be transferred to moving parts.
Selecting the correct grade carbon brush is important for commutator performance, maximum brush life, and high motor performance. We manufacture and design many patterns, grades and types of carbon brushes. Ensuring the correct carbon brush is available to meet your requirements for your motors or generators, and advice on carbon brush grade selection is given by our technical experts. The benefits to our customers include carbon brushes that can increase uptime and reduce maintenance costs by improving machine reliability and availability.
If you would like know more on our extensive electrical carbon brushes, please contact us with your application details.