[Jewelry making - Article 00232] - Re: [Orchid] Using MAPP gas for silver work?

[James Binnion]

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>     I have never heard this and suspect that it may not be correct.
>     Both propane and MAPP are hydrocarbons and hydrocarbons are
>     generally compatible with each other. Also I have used the same
>     hose for MAPP and propane on my Bernzomatic torch for over 10 years
>     with no problem at all. Has anyone else ever heard this before? 

    The problem is that there are two types of fuel gas hose approved in
    the USA for use on torches Type R and Type T. Type R is used for
    acetylene and Type T is used for propane and other fuel gasses. The
    problem comes when you run propane in the Type R hose it will eat it
    and your hose will eventually fall apart. I have seen this happen
    with some of my hoses before I knew there was a difference and it is
    not an over night kind of thing but it does degrade it and make it
    brittle. So you should verify that the hoses you are using are rated
    for the fuel gas you are using. 

Jim

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