Butane gas (C4H10) is a refined product with 98% purity. If 50 to 90% of butane blends with propane gas, the result will be liquefied natural gas. The primary use of this product is fuel. Butane can also be used to manufacture various organic substances such as acetic acid, butadiene, synthetic rubbers, butanol ethane, and propylene. In addition, other applications of this product are in the preparation of polystyrene foam and geothermal power units.