C109 is a free-machining grade of oxygen-free copper with an addition of around 0.5% tellurium. The tellurium content raises the machinability rating to 90% (free machining brass = 100%) with minimal effect on conductivity values and ductility. The tellurium is present as a fine distribution of copper telluride particles which act as a chip-breaker during machining.
This grade has superior machinability over copper sulphur as it is based on the oxygen-free grade which gives it freedom from hydrogen embrittlement. This aspect also enables the use of C109 in electrical and electronic applications where accuracy and intricacy are required.
Related Specifications of C109
- EN 12164
- ASTM B301
- E-CuTe (DE)
Nominal Composition of C109
Cu 99%, Te 0.5%
Key Features of C109
- Outstanding machining qualities
- Excellent electrical and thermal conductivity
- Freedom from hydrogen embrittlement
- Good hot and cold workability
Applications of C109
General | Transformer and circuit breaker terminals, contacts, connectors, clamps, bolts, nuts, studs and other high current-carrying components requiring free machinability
Columbia Metals – a leading supplier of C109
With decades of experience and a huge range of stock, Columbia Metals is an industry leader in the supply of C109 and other high quality specialist engineering alloys.
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