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

  • C14500
  • CW118C
  • BS2874
  • EN 12164
  • ASTM B301
  • 2.1545
  • CuTe
  • 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.

To buy or learn more about C109 contact us now, or fill in the enquiry form on the right hand side and we will be in touch shortly.

  Related Specifications Mechanical Properties
Alloy Name BS UNS BS EN Others Ultimate Tensile Strength N/mm² Minimum Yield Strength N/mm² Elongation % Hardness HB  
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