[Jewelry making - Article 00174] - Re: [Orchid] Transparent soldering pad

[mjoat]

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    The mica you would want is called Muscovite a pale almost colorless
    mica. Comes in sheets called bibles or books. Because of the near
    perfect basal cleavage is it possible to split off thin flexible
    sheets. It is what the old timers called isinglass The heatproof
    windows in old time stoves and ranges. The reason it pops apart when
    heated is you are driving off the water contained in it. About 5 per
    cent is changed to steam when heated. This being a silicate mineral.
    The infamous vermiculites that have caused concern because they
    contain asbestos dust are mica minerals that are heated to a high
    temperature to caused expansion to form a light material used as
    insulation and planting material. 

    The best place is you can't locate old electrical appliances to take
    apart is enamel/potters suppliers. Also for smaller sized pieces
    this surplus electronic sight has them for sale. 

    http://tinyurl.com/y6p43h 

    have purchased them and they are what they describe. this place has
    some great pricing on things electronic. Long time customer 

glen
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