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A carbon brush is a contact part for transferring electricity to rotating parts. Often made from pure carbon but sometimes infused with copper or silver up to 80% of the weight. Metal infused carbon is usually used where large current at low voltage is transferred, for example in large motors and generators, especially in wind turbine generators.
Since the carbon has a very high melting point it is impossible to directly melt the brush. The silver might melt but the carbon stops it from coalesce.
The dust from silver carbon brushes has the same composition as the brush so filters and catch pans also contains values.