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Section 4. MAPP Gas
chemically inert to most common materials including
steel, brass, most plastic and rubber. There is a slight
possibility MAPP gas may react with copper, or alloys
Methylacetylene propadiene (MAPP) gas is a versatile,
of more than 67 percent copper, to produce explosive
multi-purpose industrial fuel gas that offers excellent
acetylides when the gas is under high pressure. To be
performance, safety, and economy. It is used to flame
on the safe side, use steel or aluminum fixtures.
cut, flame weld, braze, solder, pre-heat, and for stress
relief. The only equipment usually required to convert
from acetylene to MAPP gas are new torch tips. One
cylinder of MAPP gas will do the work of five
Stabilized MAPP gas requires special tips for oxygen
acetylene cylinders.
cutting. Sometimes high capacity mixers are required
to convert equipment from acetylene to stabilized
MAPP gas.
At 70F MAPP gas can be used safely at full
cylinder pressures of 94 psig (pounds-per square inch
gauge). Acetylene is limited to 15 psig.
The performance of acetylene had never been equaled
until the advent of MAPP gas. It has little or no
MAPP gas toxicity is rated "very slight", but high
backfire or flashback, even when the torch tip is placed
concentrations (500 ppm) can have an anesthetic
right up against the work. On aluminum braze welds,
effect. Local eye or skin contact with MAPP gas
vapor has caused no adverse response, but the liquified
MAPP gas will leave no spatter, carbon smutting or
large areas of metal flux on the surrounding metal.
fuel may cause frost-like burns. MAPP gas is


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