MAPP gas

MAPP gas was a trademarked name (belonging to The Linde Group, a division of the former global chemical giant Union Carbide) for a fuel gas based on a stabilized mixture of methylacetylene (propyne), propadiene and propane. The name comes from the original chemical composition, methylacetylene-propadienepropane. "MAPP gas" is also widely used as a generic name for UN 1060 stabilised methylacetylene-propadiene (unstabilised methylacetylene-propadiene is known as MAPD).

MAPP gas was widely regarded as a safer and easier-to-use substitute for acetylene, but its production was discontinued early in 2008 at the only remaining plant in North America that still manufactured it. However, there are many MAPP substitutes on the market, often labeled "MAPP", "MAP-X" or "MAP-Plus", which contain mostly propylene with some propane (and, in some cases, dimethyl ether).