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In our shop (elevation 7000 feet) we use an investment mixer which
pulls a vacuum prior to mixing the water with the investment. The
investment water mix remains under vacuum for the entire
mixing/pouring/vibrating time period. After mixing, the investment
is poured into the flask which is also under the vacuum. The
investment does not foam at all. No precautions for flask overflow
are necessary. The results are excellent, and a major improvement
over the traditional system. Also worth noting is that using an
investment mixer greatly reduces the exposure to airborne investment
dust, a major health hazard in many shops.
Our machine which is no longer sold by Rio Grande, is the Saint Louis
Mixer, single model, Cost us$1200, Mfg by the same company that
distributes Kerr products in Italy. A picture of their 3 flask model
is in the Kerr Satan Cast 20 mixing instruction booklet.
Cheers Martin
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