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 - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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