Copper 145 (UNS C14500) is a tellurium-bearing copper alloy designed to retain high conductivity while machining more readily than common high-conductivity grades. It is particularly useful for turned electrical contacts, terminals, switch components, and precisely machined conductive parts. It is not the same material as ordinary oxygen-free copper.
Download the Mozaic Copper 145 Tellurium Copper Round Bar technical reference sheet (PDF)
Copper 145 Tellurium Copper Round Bar — Technical Specifications
| Property or designation | Reference information |
|---|---|
| Designation | UNS C14500 / Copper 145 / tellurium copper |
| Rod / bar specification to evaluate | ASTM B301/B301M for applicable orders |
| Tellurium (Te) | 0.40–0.70 wt% |
| Phosphorus (P) | 0.004–0.012 wt% (reference chemistry) |
| Density | Approximately 8.94 g/cm³ |
| Electrical conductivity | Approximately 93% IACS at 68°F (typical reference) |
| Thermal conductivity | Approximately 355 W/(m·K) at 20°C (reference) |
| Typical machined products | Electrical contacts, terminals, screw-machine parts |
Reference values only; the actual mill test report and ordered specification control. Mechanical properties, dimensional suitability, and performance vary by processing and condition.
Applications and Grade Selection
The tellurium addition improves chip formation. C110 copper is often preferred when the application primarily prioritizes high electrical conductivity. The two alloys are not automatic substitutes: drawing requirements, conductivity, machining method, and temper need review.
Precision Ground Bar Stock and Purchasing
Mozaic can review copper round-bar sourcing, precision centerless grinding and straightening, cutting, and packaging. Include your required UNS grade, conductivity if specified, temper, OD and finish tolerance, lengths, quantity, and mill documentation. See our copper round-bar overview for other copper grades. See Mozaic’s centerless grinding services.
Common Questions
Is Copper 145 pure copper?
No. C14500 is a specified tellurium copper alloy. Purchasing requirements must identify the alloy rather than describe it simply as 99.99% pure copper.
Can Copper 145 substitute for C110?
Not automatically; confirm the electrical and mechanical performance alongside machinability, form and temper.
Request a Quote
For quotation and availability, contact Mozaic Precision Metals, email sales@mozaicprecision.com, or call 847-637-8379.
Technical source: manufacturer / industry alloy reference. This Mozaic reference is not a mill certification.