[Jewelry making - Article 01051] - Re: [Orchid] Hot Mix Investment for High Altitude Casting

[richard hart]

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>         3. Measure water in graduated container. 

Torry,

    Tech people from the companies that produce investment tell me to get
    best results, weight water not use graduated container. 

    I did test this and measuring has a different result than weighing. 

    The problem for me, is with satin cast 20 vs prevest, satin cast sets
    up here in Denver faster than prevest at the same ratios, water and
    investment weighed. The solution for me was to use 43 to 100, instead
    of ususal recommended 40 to 100, cold water from the tap (winter
    water in Denver is cold), mix three minutes,  vacuum 1 1/2 min after
    boil, fill flask and vacuum 1 1/2 after boil, set aside where they
    are not disturbed. I wait 2 hours, steam dewax, and into the kiln.
    The mess from hot water investing was not worth doing it that way for
    me. I get good results from what I do. 

    The problem I have, is no matter how careful I am with increasing
    temp slowly, if I do not steam dewax, some sterling pieces have large
    rough textured  warts , and the gold pieces come out without the
    warts?!! 

Richard Hart

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