In the non-ferrous metal copper is one of the first to use metals. Modern non-ferrous metals and their alloys have become mechanical manufacturing, construction, electronics, aerospace, nuclear energy and other areas indispensable structural materials and functional materials.
In practical applications, usually non-ferrous metals are divided into 5 categories:
Density is less than 4,500 kilograms/cubic meter (0.53~4.5G/cm3), such as calcium, magnesium, potassium, sodium, calcium, strontium, barium, etc.
Density greater than 4,500 kilograms/cubic meter (4.5G/cm3), such as copper, nickel, cobalt, lead, zinc, Tin, antimony, bismuth, cadmium, mercury, etc.
Prices more expensive than ordinary metal, low crustal abundances, and difficult, stable chemical properties, such as gold, silver and platinum group metals.