MAPP gas is liquefied petroleum gas (LPG) mixed with methylacetylene-propadiene. MAPP is the tradename for a product of the Dow Chemical Company. In Australia it is known as RazorGas and is a trademark of ELGAS.The gas is used for welding due to its high combustiontemperature of 2927 °C (5301 °F) in oxygen. Although acetylene has a higher welding temperature (3160 °C, 5720 °F) , MAPP has the advantage that it requires neither dilution nor special container fillers during transport, allowing a greater volume of welding gas to be transported at the same given weight. Also, MAPP is advantageously used in underwater welding, which requires high gas pressures. (Under such pressures acetylene decomposes explosively to benzene, making it dangerous to use.)
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