Zinc is added by 2% along with lead and tin in solders, which are used for

copper joints

silver joints

gold joints

aluminium joints

A lead ferrule

An aluminium ferrule

A copper ferrule

A tin ferrule

Lead 50%, Tin 30%, Zinc 10% and Cadmium 10%

Lead 30%, Tin 50% and Zinc 20%

Lead 51%, Tin 31%, Zinc 9% and Cadmium 9%%

Lead 63%, Tin 35% and Zinc 2%

Tin 50% and lead 50%

Tin 60% and lead 40%

Tin 35% and lead 65%

Tin 90% and lead 10%

Heavy duty solder

Tinning

Fine soldering

Electrical joint soldering