Talk:MAPP gas

Flame Temperature
Most carbon compounds have about the same adiabatic flame temperature. Looking It looks like the constituents of MAPP have some double and tripple carbon bonds, something that you don't see in lipids, for example. Is this why it burns hotter? ―BenFrantzDale 05:54, 10 February 2006 (UTC)

Yes, the reduced hydrogen content and the lower energy cost to break the double and triple bonds to make the carbon available for combustion. As a conceptual shorthand, the structure looks more like acetylene. The reduced hydrogen helped because too much of the energy yield from the hydrogen is spent heating the oxygen - for example a hydrogen-oxygen flame is cooler than an acetylene-oxygen flame. PolychromePlatypus 16:21, 2 August 2015 (UTC) — Preceding unsigned comment added by PolychromePlatypus (talk • contribs)

Also, you might explore further by expanding your flame temp search beyond the simple chain hydrocarbons, or delving into the bond energy calculations that explain the net energy yeild. PolychromePlatypus 16:24, 2 August 2015 (UTC) — Preceding unsigned comment added by PolychromePlatypus (talk • contribs)

Recent changes
I didn't replace the RazorGas reference because I couldn't find a MSDS for RazorGas (or even a reference to it on the Elgas site!) - anyone? is it UN 1060?

There are lots of commercial gases, which are mostly propane with silly additives, pretending to have an acetylene in their name nowadays. eg "Maxigas 400 disposable cylinder -acetylene/LPG mix" - (from http://www.tradecounterdirect.com/productinfo.php?pid=445) except it doesn't contain any acetylene.

The history of the recent MAPP shortage should make if entirely obvious that the idea that MAPP became in short supply because of high demand for propadiene for plastics is an urban myth - Petromont stopped making propadiene, and they had about 20% of the propadiene market at that time. If propadiene was so valuable ...

Proposed move

 * The following discussion is an archived discussion of a requested move. Please do not modify it. Subsequent comments should be made in a new section on the talk page. No further edits should be made to this section. 

The result of the move request was: Not moved MAPP gas is the common term, and the article is largely about the proprietary gas. Salix (talk): 17:30, 12 September 2010 (UTC)

MAPP gas → —

I propose that this be moved to the non-proprietary name Methylacetylene-propadiene gas, which include a section called "MAPP gas". This is especially important since MAPP gas is no longer produced. Wizard191 (talk) 18:31, 21 August 2010 (UTC)
 * Is there any proof that this is not the common name? "Methylacetylene-propadiene gas" gets 47 hits and "MAPP gas" gets 42,000. Vegaswikian (talk) 18:53, 30 August 2010 (UTC)
 * "MAPP gas" is definitely more common, however, its a trademarked name that's no longer used. It's a pretty gray area. Wizard191 (talk) 00:59, 31 August 2010 (UTC)


 * Oppose. Keep it where it is. This article currently focusses on the proprietary gas, and the substitutes are presented as just that. Whether the official version is currently produced is irrelevant; The article text should make this clear. Moving (or perhaps it should be merging as the target article exists too) creates multiple problems and it's not obvious what it solves. Andrewa (talk) 23:57, 10 September 2010 (UTC)
 * The above discussion is preserved as an archive of a requested move. Please do not modify it. Subsequent comments should be made in a new section on this talk page. No further edits should be made to this section.

practical values
"Do your own professional welding", by Charles R. Self, ISBN 0-8306-0068-X

One doesn't need a book reference or a degree to take a torch to copper pipe or brass hangar to see the results. One should try it or be quiet.

-- Agreed. Except that I'm the guy that will get called when things don't go as planned.JSR (talk) 17:49, 7 July 2012 (UTC)
 * These additions appear welcome indeed, but recall that we do not give instructions, suggest "tips", or function as a guidebook. These suggestions are embodied in WP:NOTMANUAL.  --Smokefoot (talk) 18:48, 7 July 2012 (UTC)

practical values
mApp was invented to stabilize or replace Acetylene. It has slightly less temperature and heat so in very few situations it can't be used. Acetylene is stabilized due to the number of fatalities or cost of acetylene tank drops (explosions resulted). MAPP is still shock reactive: treat it with all precautions.

MAPP has a BTU/lb of 2100 while acetylene is 2500 and but has a smaller flame profile while doing it and operates at a different regulator pressure. 5300 F is when using an O2 tank and pressures properly.

3600 F is a the temp using a cheaper torch such as an efficient "benzomatic" ts4000 from a hardware store. To get a medium to that temperature requires allot of continued BTU/h and even isolation. Thus a higher flame temp is needed, practically speaking, to do ferrous metal melting (a small torch may be impractical). A MAPP Torch can "just barely" do copper welding or brass brazing (using proper brazing rod) conveniently (which propane can't and which is much better than soldering). A ts4000 makes plumbing soldering easier than yet cheaper propane torches (ie, it overcomes latent water in pipes easier).

See Also: Brazing Arc Welding Oxy-fuel welding Forge welding --




 * You can't characterize things as cheap, particularly when you put some companies name to it. This will all get undone, solely on that basis.JSR (talk) 18:48, 7 July 2012 (UTC)

Any value in combining methylacetylene, propadiene, MAPP gas and methylacetylene-propadiene gas?
The above articles all contain bits and pieces of the same information. For that matter, methylacetylene and propadiene are essentially identical, as they should be, as they are essentially the same compound. I realize that this discussion has been held in past, but we now have 4 articles. Two of these, methylacetylene and MAPP gas have some good content, while the other two are just stubs. Any thoughts?JSR (talk) 19:49, 7 July 2012 (UTC)

MAPP gas is/was a consumer product. I would hesitate to subsume the content in a larger context where it was less accessible. PolychromePlatypus 16:27, 2 August 2015 (UTC) — Preceding unsigned comment added by PolychromePlatypus (talk • contribs)