Phosphor bronze is an alloy of copper with 3.5 to 10% of tin and a significant phosphorus content of up to 1%. These alloys are notable for their toughness, strength, low coefficient of friction, and fine grain.

Phosphor bronze is used for springs and other applications where resistance to fatigue, wear and chemical corrosion is required. Due to their low resistance and high conductivity, the Phosphor Bronze Alloys can also be used in electrical circuits.


Bronze Alloys Euro Standard ASTM Standard British Standard 
CuSn4 CW450K C51100 PB 101
CuSn5 CW451K C51000 PB 102
CuSn4Adv - C51180 -
CuSn6 CW452K C51900 PB 103
CuSn8 CW453K C52100 PB 104