Designation PB 4 LPB 1 PB 1 PB 2 CT 1 CT 2  
Material Phosphor bronze (copper-tin phosphorous) Leaded phosphor bronze Phosphor bronze (copper-tin phosphorous) Phosphor bronze (copper-tin phosphorous) Copper-tin Copper-tin  
Elements Min Max Min Max Min Max Min Max Min Max Min Max  
  % % % % % % % % % % % %  
Copper Remainder Remainder Remainder Remainder Remainder 85.0 87.30  
Tin 9.7 -

6.5

 8.5 10.2 11.5 11.2 13.0 9.2 11.0 11.2 13.0  
Zinc - 0.5 - 2.0 - 0.5 - 0.30 - 0.05 - 0.4  
                           
Lead - 0.75 2.0 3.8 - 0.25   0.50 - 0.25 - 0.2*  
Phosphorous 0.5 - 0.4 - 0.60 1.0 0.25 0.6 - 0.05 - 0.05#  
Nickel - 0.5 - 1.0 - 0.10 - 0.50 - 0.25 1.5 2.0  
                           
Iron - - - 0.2 - 0.10 - 0.10 - 0.15 - 0.15  
Aluminium - - - 0.01 - 0.01 - 0.01 - 0.01 - 0.01  
Manganese - - - - - 0.05 - - - 0.2 - 0.2  
                           
Antimony - - - 0.25 - 0.05 - - - 0.2 - 0.1  
Arsenic - - - - - - - - - - - -  
iron-arsenic + antimony - - - - - - - - - - - -  
                -   -   -  
Silicon - - - 0.01 - 0.02 - 0.02 - 0.02 - 0.01  
Bismuth - - - - - - - - - - - -  
Sulphur - 0.1 - 0.1 - 0.05 - 0.1 - 0.05 - -  
Magnesium                       0.05  
                           
Total Impurities - 0.50 - 0.50 - 0.60 - 0.20 - 0.80 - 0.80*