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Brush Grade Information Go Back |
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| Symbols Used |
Type | Appearance | Streak |
Speed | Current | Voltage | Application | ||
| Gray E C CG |
Carbon (carbon graphite) |
chalky gray or black | Black |
low | low | medium | for old flush-mica commutators | ||
| Black E EG |
Electrographite | hard black with no or little dust residue | None or thin black | high | high | high | most new motors | ||
| Graphite G G |
Graphite | silvery like a pencil lead | Silver or black | very high | low | medium | low friction | ||
| Copper M MG |
Metal graphite | silvery and possile copper color | Gray | medium | very high | low | low resistance 12V and 24V |
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| Silver M Ag |
Silver graphite | silvery and maybe grainy | Gray | medium | very high | low | tachometers | ||