Carbon brushes are the most frequently replaced contact component in any rotating electrical machine. Selecting the wrong grade — even with the correct physical dimensions — causes accelerated commutator wear, film disruption, and premature brush failure. As a carbon brush manufacturer and supplier in India, Expo Advanced Materials helps maintenance teams and OEM engineers specify the right brush grade for every application.
Carbon Brush Grades We Supply
| Grade Family | Composition | Contact Resistance | Best For |
|---|---|---|---|
| Electrographite (EG) | Artificial graphite | Medium | General-purpose AC/DC motors, generators |
| Metal-graphite (MG) | Graphite + copper or silver | Low | High-current low-voltage applications, traction motors |
| Natural graphite | Natural graphite flake + binder | Medium-high | Slip rings, alternators in clean conditions |
| Resin-bonded | Carbon + phenolic resin | High | High-speed small motors, instrument motors |
Applications We Supply
- Industrial motors — DC motors for steel mills, paper mills, cranes, mine hoists. EG and metal-graphite grades for high current densities.
- Generators and alternators — Slip-ring brushes for hydro, thermal, and diesel generating sets. Natural graphite and EG grades to minimise ring wear.
- Wind turbines — Slip-ring brushes for pitch and yaw systems, and main shaft ground brushes. Formulated for high-humidity coastal environments.
- Traction motors — Metro rail, locomotive, and EV traction motor brushes. Metal-graphite grades for sustained high-current operation.
- Automotive — Starter motors, wiper motors, window lift actuators, fuel pump motors. High-speed resin-bonded grades.
Custom Dimensions and OEM Cross-Reference
We manufacture brushes to any cross-section (3 × 5 mm up to 50 × 80 mm) and length (10–200 mm). Terminal connections: fixed lead, spring-loaded shunts, top-cap, or bare (customer-fitted). We cross-reference against all major OEM brush suppliers — SGL Carbon, Mersen, Schunk, Morgan Advanced Materials, and Sécheron — by grade code and dimensions.
How to Order
Provide brush dimensions (width × thickness × length in mm), machine type and rating (kW, rpm, voltage), current density requirement, and your OEM grade code if known. We recommend the optimum grade and confirm pricing within 24 hours. Minimum order: 10 pieces per size.