[Jewelry making - Article 00876] - Re: [Orchid] Prips Flux preparation problems

[FrodoGem]

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    I had the same problem with Pripps and more or less gave up on it. I
    finally figured out the problem: Most TSP on the market today also
    contains sodium silicate. Sodium silicate only remains soluable in
    basic solutions. When you add the boric acid, the sodium silicate
    precipates out as silica gel, a form of silicon dioxide.  (Silicic
    acid is formed by the dissolution of silicon dioxide in water. It is
    an equilibrium reaction that strongly favors the SiO2 phase) I
    believe that if you can find some TSP that does not contain sodium
    silicate, you would not have the precipitation problem. 

Howard Woods
Eagle Idaho


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