[Jewelry making - Article 00223] - Re: [Orchid] Using MAPP gas for silver work?

[James Binnion]

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>     Thanks for the responses about soldering silver with MAPP-- I
>     gather it is hotter than propane, not quite as hot as acetylene,
>     and should work OK-- but with what torch(es)? Can you just use it
>     with a Smith or Presto Lite or whatever you have (with new/different
>     hoses)? 

    It will not work well with prestolite or equivalent acetylene-air
    torches. MAPP needs more oxygen (air) per unit volume (3.3:1) to
    combust than acetylene (1.2:1) and some what less but closer to the
    amount needed by propane (4.3:1) so it will work in a air-fuel torch
    designed for propane better than one designed for acetylene. There
    are a few torches designed for MAPP of the 1 lb cylinder design
    (Bernzomatic) but not many. It will work fine in any oxygen-fuel
    torch. Hoses need to be rated for use with MAPP 

Jim

James Binnion
jbin AT mokume-gane.com
James Binnion Metal Arts
http://www.mokume-gane.com
360-756-6550
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