Weight %. Tellurium inclusions break chips without seriously degrading conductivity; a trace of phosphorus deoxidizes the melt.
| Element | Symbol | Min % | Max % | Typical % |
|---|---|---|---|---|
| Copper (incl. Ag) | Cu | 99.2 | 99.6 | 99.4 |
| Tellurium | Te | 0.40 | 0.70 | 0.55 |
| Phosphorus | P | 0.004 | 0.012 | 0.008 |
| Property | Condition | Value | Unit |
|---|---|---|---|
| Tensile Strength | soft → hard | 230–400 | MPa |
| Yield Strength | soft → hard | 70–350 | MPa |
| Elongation | by temper | 8–45 | % |
| Electrical Conductivity | annealed | ~93 | % IACS |
| Thermal Conductivity | — | ~355 | W/(m·K) |
| Machinability | vs C36000 = 100 | 85% | — |
| Density | — | 8.94 | g/cm³ |
| Melting Range | solidus–liquidus | ~1050–1075 | °C |
| Standard | Designation |
|---|---|
| UNS / ASTM (USA) | C14500 — ASTM B301 |
| EN — equivalent | CW118C / CuTeP |
| Related pure copper | C11000 / Cu-ETP |
| Trade name | Tellurium Copper / Te-Cu |
C14500 is free-machining copper per ASTM B301 — 99.2–99.6% copper with 0.4–0.7% tellurium and a trace of phosphorus. The tellurium forms inclusions that break chips, lifting machinability to 85% (versus ~20% for pure copper) while retaining 93% IACS electrical conductivity.
Choose C14500 whenever the part has real machined geometry — threads, cross-holes, grooves, small diameters. The 7% conductivity penalty versus C11000 is usually invisible in service, while cycle times, tool life, and surface finish improve dramatically. Keep C11000 for simple high-current busbars where every %IACS counts.
The EN designation is CW118C (CuTeP) — the same tellurium-copper metallurgy. Bar stock typically certifies to either designation; we confirm certificate wording at quotation.
Yes — C14500 suits our sliding-head CNC and Swiss-type machines well, and is our recommended grade for machined electrical components such as connectors, terminals, and welding-torch parts. Parts are made to your drawing; send it for a quote within 24 hours.
Free-machining copper for electrical components — 93% IACS, made to your drawing. ISO 9001:2015. Quote within 24 hours.
Request a QuoteComposition ranges, mechanical properties, machinability ratings and regulatory data on this page are cross-referenced against the publishers below. Tolerances and minimum values are taken from the relevant published standard at the time of writing — for procurement specification, always reference the current published edition.
Last reviewed: June 2026. EN/ISO/ASTM standards are updated periodically. This datasheet reflects the editions listed; for safety-critical or contract-critical applications, always verify against the current published edition of the standard. For project-specific deviations or supplier-specific composition windows, request a Type 3.1 mill certificate (EN 10204) with your order.