UNS Copper-Alloy Designation

Copper metal Alloys that have a designated minimum copper content of 99.3% or higher. 

High copper alloys For the wrought products, these are alloys with designated copper content of less than 99.3 wt.% Cu but more than 96 wt.% Cu that do not fall into any other copper alloy group. The cast high copper alloys have designated copper content in excess of 94 wt.% Cu, to which silver may be added for special properties. 

Copper nickels (Cu-Ni) These are alloys contain nickel as the principal alloying element, with or without other designated elements. 

Leaded coppers These comprise a series of cast alloys of copper with 20 wt.% or more lead, sometimes with a small amount of silver, but without tin or zinc. 

Special alloys Alloys whose chemical compositions do not fall into any of the above categories are combined in special alloys. 

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