[Jewelry making - Article 00189] - Re: [Orchid] Butane for torch

[jesse brennan]

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    Butane is a clean burning fuel but all "butane" you may buy is not
    just butane. Butane is a  C4  ( 4 carbons per molecule ) component
    of liquid petroleum gas.  Varying composition will effect flame
    characteristics on a small scale   Most LPG  is considered to be
    propane   C3,  but in areas with high  ambient temperatures  it may
    contain some or even consist  mostly of butane to keep cylinder
    pressures down.   What is available is a mixture regulated by
    acceptable vapour pressure limits and component   $ value.   It  may
    not be a consistent acting fuel  as you have found out.  I don't
    know if the "Super" grade stuff regularly sold   is anything special
    but it may be more consistent.  The best you can do is find the
    cheapest price type that works for you.  You can buy  really pure
    known composition lab grades stuff but it  will not be available
    cheaply and without a little difficulty for you . Use what works. 

Jesse



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