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What ever happened to MAPP gas?

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Ben321:
I know they don't sell it anymore, and instead sell something called Map Pro gas now instead. I also heard it burns much cooler now. Why the change? MAPP gas was supposed to be good for welding with a small rig, because it didn't need to be stored in large cylinders like acetylene, only small cylinders like propane. But for some reason MAPP gas is no longer made. Why? And unfortunately Map Pro gas doesn't actually burn hot enough to weld with (based on some temperature values I've been reading on the internet, it only burns a 100 or 200 degrees hotter than propane, whereas acetylene and MAPP gas burned a couple THOUSAND degrees hotter than propane). So now is there any good substitute for acetylene that, like MAPP gas, can actually be stored in small cylinders?

langwadt:
https://www.garagejournal.com/forum/threads/why-was-mapp-gas-discontinued.419683/

Ben321:

--- Quote from: langwadt on July 06, 2022, 12:11:52 am ---https://www.garagejournal.com/forum/threads/why-was-mapp-gas-discontinued.419683/

--- End quote ---

From my understanding, it was an issue (possibly a leak at the seal where the hose attaches) with some of the larger professional tanks used by major companies for welding operations (not small ones you find in a hardware store, for ordinary folks to do small welding projects in their garage). The small hardware-store-bought MAPP gas tanks were as safe as the small hardware-store-bought propane tanks, from my understanding.

For some reason, the factory stopped making the big leak-prone tanks, and then instead of just making more of the small safe tanks (like boosting production of the small tanks after discontinuing making the large tanks), they did something really stupid. They completely closed the factory. I don't know why. But I hope to find a reasonable alternative (and no, Map Pro is NOT a reasonable alternative). You can't weld with Map Pro gas, not even when using it in conjunction with an oxygen tank and an oxy+fuel rig. The flame still won't get quite hot enough to melt steel or even raw iron. It's enough to get the iron white hot (at which point it will be very soft, but not quite a liquid), so that means that even in in an oxy+fuel configuration, Map Pro gas can't weld iron. I don't even know why Map Pro gas exists. Propane is a cheaper alternative to Map Pro gas for standard torch uses that don't involve welding/melting iron or steel. So I don't know why Map Pro exists at all.

There may be some VERY RARE application, in which the small temperature difference between propane and Map Pro gas flames is important, but if there is, I don't know what it is.

SilverSolder:

Sometimes you can be lucky and find real MAPP gas -  I found a welding store in NY years ago that had a stash.  Expensive, of course...

Monkeh:

--- Quote from: Ben321 on July 06, 2022, 12:01:21 am ---(based on some temperature values I've been reading on the internet, it only burns a 100 or 200 degrees hotter than propane, whereas acetylene and MAPP gas burned a couple THOUSAND degrees hotter than propane)

--- End quote ---

Rubbish. MAPP only burns that hot mixed with pure O2, just like acetylene - in open air it's only a little hotter - maybe 200C at best.

Other propylene mixes are perfectly good, if you need that much more heat you should just use acetylene.

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