of sod a ash, they will deteriorate the crucible at tl* points of contact when they melt. If soda flux** sand, it will definitely flux your crucible.
• Keep tramp metals and foreign materials out of cullet or batch. Metals can drill holes through crucibles.
• Remove glass from the crucible and reduce the temperature if the operation is placed in an idled or holding pattern for a prolonged period of time. There are other reasons for pots breaking in
addition to the ones stated. Of course, you can crack a crucible if you hit the pot with your blow pipe or a mongo ladle. It is also possible that your pot was cracked before you put it in the furnace. J Check your pot carefully; it may have cracked in shipping. If it has, refuse the shipment and fight it out with the shipper. Do not store pots inside each other to save space. The weight j of the top pot will crack the one j below. If your pot happens! to crack after being used one j week and you call the company* j they’ll give you a hard time and for good reason. They have no way j of knowing how you treated your I pot after setting it; they have no way of J knowing if heated it too quickly; they have | no way of knowing who is at fault. I know of j situations where Pete VanderLaan replaced pots that 1 broke prematurely but that’s Pete, not the company * Pots also crack due to thermal gradients in the furnace 1 itself. Don’t put a cold pot in a hot furnace. Again, 9 don’t drop huge chunks of cullet into the pot. Use j common sense; pots are very fragile when they are hot. ] The bottom line is this: baby your pot, heat it slowly, 1 cool it slowly, and don’t use a very active glass. The | lower the viscosity of your glass, the faster it will eat j the crucible. Your pot may last a year if you’re lucky. J Again, the average life of a crucible is estimated to be about 90-100 charges if you’re using batch. Your crucible will last longer if you use cullet.
It is a fact, though, that freestanding crucible furnaces are a much more economical than day tanks. The advantage to day tanks is that they can take a great deal of abuse. If you do a lot of sand casting and use big, heavy ladles, you might consider building a day tank.
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