[Jewelry making - Article 00007] - Re: [Orchid] Investment to Water Ratio

[MStover]

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Tai

    Your water to investment ratio is dependent on what type of castings
    your are trying to make.  For large castings typically 38 parts
    water to 100 parts investment, medium 39, and fine casting 40. 
    Since I do not know the volume of your investment mixed, I can only
    offer an idea of the amount of investment needed and you can
    reference the existing chart you have. 

    Flask Size 2" x 2.5" and 2.5" x 2.5" you will need less than one
    pound of investment per flask, my suggestion go with 1 pound. 

    For 2.5" x 3" you will need close to one pound of investment. 

    For 2.5" x 4"  you will need 1.5 pounds of investment per flask. 

    As an example, if you are doing 4- 2.5" x 2.5" and you are going to
    need 4 pounds of investment cross reference how much water is needed
    for the ratio you are going to use.  Another way is to convert
    pounds into grams and multiply by the ratio you are going to use.  4
    pounds= 1,816 grams X .40 (water to investment ratio) = 726.4 grams
    of water.  1g=1ml 

    Allow your flasks to sit undisturbed for 2 hours before steam
    dewaxing. After steam dewax, immediately transfer the flasks into a
    preheated oven  AT  300F.  Do not allow the flasks to stand at room
    temperature for more than ten minutes. 

Sincerely,
Michael L. Stover
Product & Application Specialist
Jewelry & Solid Mold
Ransom & Randolph



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