UN Number: 1060  Risk Grades: 2.1

Mapp gas: 
Is a mixture of various hydrocarbons,principally,methylacetylene,propadiene and Propane(MAPP).It produce a relatively hot flame(2976) with a high heat release in the primary flame (inner cone)(15445kJ/m3),less than for acetylene(18890kJm/3) But much higher than for propane(10443kJm/m3).
The secondly flame also gives off a high heat release,similar to propane and natural gas.The combination of a lower flame temperature,more distributed heat source and larger gas flows compared with acetylene result in a substantially slower pierce time. 

Mapp gas is a mixture of various hydrocarbons, principally, methylacetylene , propadiene and Propane(MAPP). It produces a relatively hot flame (2,976°C) with a high heat release in the primary flame (inner cone) (15,445kJ/m 3 ), less than for acetylene (18,890kJm 3 ) but much higher than for propane (10,433kJm 3 ). The secondary flame (outer cone) also gives off a high heat release, similar to propane and natural gas. The combination of a lower flame temperature, more distributed heat source and larger gas flows compared with acetylene results in a substantially slower pierce time.