Many of us use methane fuel (CH4), normally often called natural fuel, in the home for cooking. Once the gas is heated (by a flame or spark) and if there is enough oxygen during the atmosphere, the molecules will break apart and reform completely as drinking water and carbon dioxide. https://fire-rated-ductworth-insu45566.tinyblogging.com/not-known-factual-statements-about-fire-rated-ductworth-insulation-80370513