MAPP gas is a stabilized mixture of various hydrocarbons, principally methyl acetylene and propadiene. It produces a flame temperature (2,976°C) second only to acetylene when burned in oxygen. It has a high heat release in its primary flame (inner cone) (15,445kJ/m³), slightly lower than that of acetylene (18,890kJ/m³) and much higher than that of propane (10,433kJ/m³). Its secondary flame (outer cone) also gives off a high heat release, similar to propane and natural gas.