MAPP gas is a stabilized mixture of various hydrocarbons, principally methyl acetylene and propadiene. It produces a flame temperature (2,976 centigrade) second only to acetylene when burned in oxygen. It gas a high heat release in its primary flame (inner cone) (15,445kJ/m3), slightly slower 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.