[Jewelry making - Article 00324] - Re: [Orchid] Substitute for vermiculite and alumina hydrate?

[nick]

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    Potters use it for coating kiln batts to stop running glaze sticking
    pots to them (shelves). It is normally a mixture of alumium oxide,
    hydroxide and kaolin. Silica is NOT suitable as an alternative at it
    can react with the elements in the furnace and will react with any
    glass or flux around and form its own corrosive products (as well as
    do you harm). Alternative choices would be Woolastonite, Magnesium
    oxide or Magalox. MgO reacts with water when heated but will
    restabilize when you heat it beyond a few hundred degrees. Ask for
    Batt wash and a ceramics supplier will know what you want. I hope
    that this is helpful info for you 

Nick
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