(Chemical symbol: Zn). A lustrous, bluish-white metallic element alloyed with copper to form brass, and is also used in solders. Zinc is used in protective coatings on galvanized iron and other metals. Atomic number, 30; atomic weight, 65.37; melting point, 419.4oC (786.9 oF). Specific gravity ranges from 7.0 to 7.2.
Pure zinc is ductile; in commercial form, zinc is brittle at room temperature, but becomes ductile when slightly heated. At a temperature of 200°C (392°F), it can be powdered. At temperatures between 100 and 150°C (212 and 302°F) this metal becomes malleable and can be rolled into sheets or drawn into wire. Zinc is capable of a high surface polish; it oxidizes slowly in air. When molten zinc solidifies, it expands somewhat, so that when it is used in die casting, sharp, well defined castings can be produced. Zinc is readily attacked by mineral acids, and dissolves when boiled with caustic soda or potash solution