[Jewelry making - Article 00241] - [Orchid] Burn-out cycles for RP

[Paul D. Reilly]

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James,

>     Speaking of burnout cycles, How about the best for RP resins? 

    The cycle I use for Perfactory and Viper models is as follows: (all
    in Fahrenheit) flask into cold oven; raise temp 600 degrees per hour
    to 300-hold for three hours; raise temp by 600 degrees per hour to
    700-hold for 2 hours; raise temp by 600 degrees per hour to 1000-hold
    5 hours; raise temp by 400 degrees per hour to 1400 (to 1450)-hold 4
    to 5 hours; drop temp down as quickly as kiln will cool to your
    holding casting temp (casting temp dependent upon the metal being cast
    and model design) hold at casting temp 1/2 hour to 1 hour to stabilize
    temp. 

    With ramp times and holding times this works out to be about a 17-1/2
    hour burn-out cycle. Because of the high temp needed for the RP
    models you need to use either a platinum investment or R&R's
    Ultravest-Maxx. I use the later with excellent results. (as always
    said....not associated with the company, just happy end user of their
    product). 

    Using the above burn-out schedule and the specified investment
    material, you will get very clean, smooth castings from both
    Perfactory models and Viper models, provided you do a compressed air
    blow out of the mold prior to casting...I use 30 pounds air pressure
    to do this, holding the flask with button hole facing down and
    blowing across the button hole to create a Venturi effect sucking any
    remaining dust out of the mold. 

Paul D. Reilly

 
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