Lead is one of the most used metals in industry, being just surpassed by other metals as iron, copper, zinc and aluminum. The main application of lead and of its oxide (PbO) is producing electrical batteries for vehicles.
Lead alloys are largely used in industry. The addition of a small percentage of arsenic, or antimony, to the lead, increases its hardness and mechanical resistance, protecting it from abrasion. The calcium-lead and the tin-lead alloys are used in coating certain electrical cables.
Current solder is a lead-tin alloy, in variable proportions in agreement with the requested melting point. The bismuth, cadmium or mercury addition can also affect the melting point of solder.