They are made out of different materials depending on the application. Can use ordinary cast steel if you are pouring brass, aluminum, lead or Babbitt. For steel , on the high end, they be graphite , platinum, or combination of both. In Pakistan though, just ordinary fire clay that is good for a few pours, then make a new one. Obviously, they are very dangerous when they start deteriorating. I dont know if the crucible itself was ever made of plaster, but if you were building a home made furnace, you could definitely line the inside and the lid with plaster.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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