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Oxygen Free Copper Rod Electrolytic Copper 99.99%
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 Posted: 2011-02-26 14:15
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 Chilean Oxygen Free Copper Rod

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 Posted: 2011-02-02 14:59
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 With a great pleasure I hereby inform you that our supplier has achieved
ISO 9001:2008 Certification for Manufacture of Oxygen Free High Conductivity Copper Rod (OFHC)
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 Posted: 2010-09-03 14:05
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 GIA Trading Group Oxygen Free Copper Rod

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 Posted: 2010-09-03 13:42
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 Cu-OFHC will serve any of the purposes fulfilled by Cu-ETP, but has some additional properties of importance in particular applications.

Advantages of OFHC oxygen-free copper (OFHC-Cu)
  1. The absence of occluded oxides at the grain boundaries in Cu-OFHC results in a more ductile material. This can be important in such applications as in aerospace, automotive wiring harnesses, robot arms and other similar applications, where the copper conductor core of a wire or cable is subjected to repeated flexing
  2. The absence of occluded oxides at the grain boundaries in Cu-OFHC produces less "noise" and is thus of increasing interest in such applications as high quality sound recording systems
  3. The elimination of the risk of hydrogen embrittlement in copper through the use of Cu-OFHC is an important characteristic in welding applications
  4. Another important market trend which is favoring Cu-OFHC is the explosive growth of the market for electronic devices and the progressive miniaturization of electronic components. This has resulted in a demand for ever finer wire gauges
  5. Flexible Power Cables. Fine wires are now being regularly drawn on multi-wire machines with up to 32 strands. More and more attention is now being given to the causes of wire breaks in drawing, as demand for finer and finer wires increases. The use of multiwire drawing machines, processing up to 32 strands simultaneously greatly increases the efficiency of the fine wire drawing process, but only so long as wire breaks can be routinely avoided. Conversely, the whole machine must be stopped and rethreaded when a wire break occurs
  6. The purity of the metal and the absence of oxide particles in the structure become matters of serious concern. Here too, Cu-OFHC has distinct advantages over Cu-ETP. In production, the cast material exits the casting die and cooler assembly at around 80°C, well below the surface oxidation temperature. Cu-OFHC thus has a very thin layer of surface oxides, significantly less than Cu-ETP
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 Posted: 2010-09-03 13:40
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 OXYGEN FREE HIGH CONDUCTIVITY COPPER (Cu-OFHC)  RODS have a minimum copper content of 99.99%. For this kind of product, the ASTM STANDARD establishes a maximum level of oxygen of 10 ppm. In our case, normally a maximum oxygen level is 5 ppm.
 
Cu-ETP (Electrolytic Tough Pitch) ASTM STANDARD has a minimum copper content of 99.90%. Oxygen is intentionally alloyed with the copper in production of Cu-ETP and is controlled to around 200-400 ppm. The oxygen acts as a scavenger for dissolved hydrogen and sulphur and will react also with most other impurities, to form insoluble oxides at the grain boundaries. This prevents these from dissolving in the copper matrix and adversely affecting conductivity and annealability of the rod and drawn wire. Conversely, however, the presence of occluded oxides in the copper wire rod, while solving one problem, can lead directly to another, as oxides tend to form hard particles and lead to wire breaks in fine wire drawing.
 
Production of oxygen-free copper is thus more demanding of the quality of the in-going cathode feedstock used in the process. Conversely, there will be little or no formation of oxides along the grain boundaries which, as mentioned earlier, is often a cause of wire breaks later on.
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 Posted: 2010-08-18 23:26
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 GIA TRADING GROUP now offers Oxygen Free Copper Rod:
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