[Jewelry making - Article 00118] - Re: [Orchid] Transparent soldering pad

[Dave Arens]

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Hi Gang,

>     The most likely thing to use for this would be a sheet of mica -
>     the kind of stuff that is found in furnace door windows

    I'm not sure how many types of mica there are. Several years ago I
    bout a couple of pieces of mica about 4 inches x 6 inches, with the
    thought of using them for a similar application. 

    While it's true that mica is fire proof, it has one bad
    characteristic (at least the stuff I got did). It expands unevenly
    when heated. 

    I had positioned several small objects next to each other in
    preparation for soldering. Imagine my surprise when I put the flame
    to them & in a few seconds the mica expanded & the pieces literally
    jumped off the mica. After that experience, I tried playing he flame
    over the mica to warm it as evenly as possible. Even using this
    technique, the mica expanded unevenly. Needless to say, I gave up on
    mica & went back to my trusty fire brick. 

Dave
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