Particular characteristics of coppers for electrical purposes
| Copper type | Characteristics | Material designation | |
|---|---|---|---|
| Symbol | Number | ||
| Tough pitch coppers (oxygen-containing coppers) | Coppers of this type are produced with a controlled amount of oxygen and have high electrical conductivity. Special precautions are necessary when heat-treating, welding or brazing these coppers in atmospheres containing hydrogen to avoid hydrogen embrittlement. | Cu-ETP1 Cu-ETP Cu-FRHC | CW003A CW004A CW005A |
| Oxygen-free coppers | Coppers of this type are produced in an oxygen-free environment without the use of deoxidisers and have high electrical conductivity. These coppers may be heat-treated, welded or brazed without the need for special precautions to avoid hydrogen embrittlement. | Cu-OF1 Cu-OF Cu-OFE | CW007A CW008A CW009A |
| Deoxidised coppers | Coppers of this type are produced with the addition of a controlled amount of deoxidiser, preferably phosphorus, and contain a controlled low amount of residual deoxidiser; these coppers have high electrical conductivity. These coppers may be heat-treated, welded or brazed without the need for special the need for special precautions to avoid hydrogen embrittlement. | Cu-PHC Cu-HCP Cu-PHCE | CW020A CW021A CW022A |
| Silver-bearing coppers | Tough pitch, oxygen-free and deoxidised coppers can be produced with additions of silver, up to '0,12 % (mass fraction). The effect of the silver content is to increase the resistance to softening without significantly affecting the electrical conductivity. | CuAg0,04 CuAg0,07 CuAg0,10 CuAg0,04P CuAg0,07P CuAg0,10P CuAg0,04(0F) CuAg0,07(0F) CuAg0,10(0F) | CW011A CW012A CW013A CW014A CW015A CW016A CW017A CW018A CW019A |