Helwig Carbon H704 High-Speed Turbine Carbon Brush

Helwig Carbon H704 is a graphite carbon brush engineered for high-speed turbine applications. It is designed to maintain electrical contact in turbo generators while supporting low-friction operation and balanced current distribution. Its published operating profile supports demanding power generation environments.

- Graphite brush material maintains conductive contact against rotating surfaces in high-speed turbine systems.
- Low-friction behavior helps reduce interface heat as surface speed increases.
- Balanced current distribution supports more stable current transfer during operation.
- Even wear characteristics help sustain contact consistency over extended service intervals.

- Graphite classification with 0% metal content and resistivity of 0.0006 Ω-in (15 µΩ-m).
- Rated for peripheral speeds up to 180 mph (80 m/s) and current density up to 64.5 A/in² (10 A/cm²).
- Maximum temperature rating is 278.6°F (137°C) with published voltage drop of 3.2 VDC.
- Shore hardness is 15 Sc and flexural strength is 1000 PSI.
- Published coefficient of friction is low, listed as <0.20, with charted value of 0.14 in the comparison data.

- High-speed turbo generators.
- Turbine applications operating in the 3000–3600 RPM range.
- Generating equipment used in power generation environments.