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[JradM]

I had no idea MAPP was discontinued. I've never used or needed it, even on my rust belt Subaru ball joints. But I keep hearing people referring to MAPP for high heat, so what are they referring to if it's discontinued and not this?

It's a mix of MAPP and Propane (MAPP - Pro). Propane burns at a temperature a little below 2000 C, Mapp-Pro bumps it up a little (to like 2050). The old map was more like 2500 or higher if mixed with oxygen.

I've heard discussion that maybe Mapp-Pro is better than it sounds because of some heat-transfer quality, but I'm not qualified to speak about that. You can also mix oxygen with propane to increase it's temperature, so I suppose it all depends on what you're aiming to do.

I still use MAPP Pro occasionally, when I get a good price, but it also depends on whether you have a high-heat torch or a pencil flame.