These are roughly 1 pound bars of 99.9% pure tin in bar form. Atomic Number = 50 | Melting Point (F) = 450 | Atomic Mass= 118.71 | Boiling Point (F) = 4100 | Density (g/cm3) = 7.29 | Tin has many uses. It takes a high polish and is used to coat other metals to prevent corrosion, such as in tin cans, which are made of tin-coated steel. Alloys of tin are important, such as soft solder, pewter, bronze and phosphor bronze. A niobium-tin alloy is used for superconducting magnets.