Copper C145 (Tellurium)
Copper C145 – Tellurium-Bearing Free-Machining Copper for Electrical Connectors
Copper C145 adds 0.5% tellurium to 99.9% pure copper to achieve 90% of brass machinability while retaining 93% IACS electrical conductivity. This unique combination makes it the optimal choice for precision-machined electrical connectors and terminals that require both high conductivity and complex turned geometries unachievable with standard ETP copper.
Key Properties
- Machinability Rating: 90% (vs brass reference at 100%)
- Electrical Conductivity: ~93% IACS
- Thermal Conductivity: 360 W/m·K
- Tellurium Addition: 0.5% Te for chip breaking
- Density: 8.94 g/cm³
- Standards: ASTM B301 / CDA 145
Common Applications
Electrical connectors, terminals, switchgear components, welding torch tips, transistor bases, and any precision-screw-machined part requiring high conductivity with complex geometry.
Material properties
| Material name | Copper C145 (Tellurium) |
|---|---|
| Type | Copper & Alloys |
| Standard code | ASTM B301 / CDA 145 |
| Tensile strength (MPa) | 221 |
| Yield strength (MPa) | 69 |
| Fatigue strength (MPa) | 69 |
| Elongation (%) | 25 |
| Hardness (Brinell) | 50 |
| Density (g/cm³) | 8.94 |
| Electrical resistivity (µΩ·in) | 1.8 |
| Thermal conductivity (W/m·K) | 360 |
| Melting range (°C) | 1083 |
| Weldability | Fair |
| Formability | Good |
| Shear modulus | 44 |
| Industry code | copper_c145 |