British Standard : PB1  
Indian Standard : 
Nominal Composition : 89 / 10 / 0 / 1 
Tensile Strength (kg/mm2) : 22-28 
Elongation % on 2" : 2-8 
Brinell Hardness : 60-100 
Typical Uses : Bearings for aero engines, diesel engines, electrical generators and rolling mills. 

British Standard : PB2  
Indian Standard : 
Nominal Composition : 88/12 
Tensile Strength (kg/mm2) : 22-31 
Elongation % on 2" : 5-15 
Brinell Hardness : 75-110 
Typical Uses : Gear and worn wheels 

British Standard : PB3  
Indian Standard : 
Nominal Composition : 90/10 
Tensile Strength (kg/mm2) : 23-31 
Elongation % on 2" : 10-20 
Brinell Hardness : 70-90 
Typical Uses : Pressure vessels, pump body castings and impellers for chemical plants 

British Standard : PB4  
Indian Standard : 
Nominal Composition : 90.5 / 9.5 
Tensile Strength (kg/mm2) : 19-26 
Elongation % on 2" : 3-12 
Brinell Hardness : 70-95 
Typical Uses : Bearings for aero engines, diesel engines, electrical generators and rolling mills. 

British Standard : LPB1  
Indian Standard : 
Nominal Composition : 87/8/2/3 
Tensile Strength (kg/mm2) : 18-25 
Elongation % on 2" : 3-12 
Brinell Hardness : 60-90 
Typical Uses : Bearings and bushes for lighter duties