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Re: [Orchid] Tension release fomula  
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From: Peter W . Rowe
Date: Thu Jan 08 23:28:04 2004
 
     
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    Jim, if you're using standard casting investments like Satin cast 20,
     Romanoff, Americast,  or similar products from other manufacturers,
    you probably don't really need a "tension release". Also called
    "debubbleizers",  these things were needed many years ago, before the
    investment formulas included surface tension reducers.  But so far as
    I've been told, all the modern decent investment formulas include
    such agents, and adding more to your wax does little good,  and can
    actually cause problems with some investments (platinum type
    phosphate bonded ones especially).    In general, if you're having
    trouble with air bubbles, the problem isn't a lack of surface tension
    releasing agents,  it's more likely one of inadequate vacuuming, or
    improper investing procedure. 

Peter


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