We manufacture a variety of silver graphite brushes and other sliding electrical contacts designed with pure precision to handle the most demanding environments. The combination of silver and graphite material offers high conductivity, excellent thermal performance, and a low wear rate, making it the best solution for a variety of critical applications.
The pure silver material provides high conductivity and low resistance while the graphite material provides self-lubricating properties in the brushes. We are able to apply additives to the graphite material which improves the self-lubricating properties to better suit the dry atmospheres in high altitude applications. Our silver graphite brushes & contacts will not melt nor weld to connecting metal surfaces as the graphite material cannot be melted. Compatible with the following contact surfaces: brass, bronze & steel.
Typical order turnaround is 3 weeks
Ability to produce upwards of 30,000 sliding contacts in 1 order
Pressing Capabilities from 6 tons to 250 tons of pressure
6 Furnace Systems to sinter materials for strength
Tolerance Capabilities
– Press to size = .006
– Plate Material = .02
Power Blending Room to evenly and accurately mix grade materials
Our proprietary silver graphite brushes will effectively divert induced shaft currents to ground, protecting the motor bearings from pitting, fluting, vibration and premature bearing failure.
Helwig Carbon provides the shaft grounding industry the lowest resistant path to ground via a proprietary silver graphite brush grade to protect from damaging VFD-induced shaft currents. This one-of-a-kind brush grade is 5X lower in resistance than
Helwig Carbon continues to excel in its ability to provide press-to-size parts to the electrical sliding contacts industry. In recent years we have expanded our operations to provide additional capacity to meet this area of growth. Thorough quality assurance steps have led to a significant reduction in lead time and eliminated unnecessary secondary machining operations that many of our competitors’ experience in their operations.
The function of a carbon brush on power ring vs. a grounding ring is significantly different! Many customers use copper graphite for power rings and use similar copper graphite grades for grounding rings. This typically results in grooving of the ground rings. The function of the carbon brush on power and ground slip ring is significantly different. This is where Helwig’s silver graphite grade K297 excels. This grade was specifically designed for grounding applications and is becoming popular in the wind turbine market.
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