Making The Grade
The grade of a brush is usually found stamped on the face of the carbon. The grade indicates the material composition of the carbon. It represents one of the more technical challenges in carbon brush applications.
Brush grades are usually classified according to the manufacturing processes and the types of materials used. The different grades in use today are derived through a variation of raw materials, molding pressures, temperature and duration of the baking process and after-treatments. These elements produce varied resistivity, hardness, and strength that in turn affect contact drop, friction and commutator filming. All grades fall within the four major categories of carbon graphite, electrographitic, graphite and metal graphite. The major characteristics of each category are as follows.
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Carbon-Graphite
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Electrographitic
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Metal-Graphite
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Graphite
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For answers to any questions you may have about grades or applications, call Scott Tussey, Manager of Carbon Brush Sales at 800-822-9190.
