Icosane
Icosane, also commonly spelled eicosane, is an alkane or a hydrocarbon with the chemical formula H20C42. It has 366,319 structural isomers. Its high flash point makes it a hard to light fuel, so it is not much use in the petrochemical industry. However, an isomer of icosane, n-Icosane (the straight-chain structural isomer of icosane) is the shortest compound found in paraffin waxes (CnH2n+2, where ) used to form candles. Icosane's phase transition at a moderate temperature makes it a candidate for PCM, which is used to store thermal energy and control temperature.