Methane CH4 CAS No.: 74-82-8 EINECS No.: 200-812-7 UN No.: UN1971 Purity: 99.9%-99.999% Dot Class: 2.1 Appearance: Colorless Grade Standard: Electronic Grade, Industrial Grade As a Fuel Methane is used as a fuel for ovens, homes, water heaters, kilns, automobiles, turbines, and other things. It combusts with oxygen to create fire. In the Chemical Industry Methane is converted tosynthesis gas, a mixture of carbon monoxide and hydrogen, by steam reforming.