Patina
The greenish layer that naturally develops on Copper exposed to the atmosphere. Chemically it is a complex mixture of Chlorides, Carbonates and Sulphides.
Pre-patinated sheet is used for roofing applications.
Phosphor Bronze, Leaded Phosphor Bronze
Hard and strong cast and wrought Copper/Tin alloys with small, deliberate, Phosphorus additions.
Wrought alloys such as PB102 contain 4% to 8% Tin, whilst cast alloys contain 9% to 12% Tin.
Leaded Phosphor Bronzes, with Lead contents up to 20% ,are usually available only as castings – Examples are PB1 and SAE660.