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86.How to cast metals with plastic molds ？

Do you know how to cast metals with plastic molds? Certainly you will think the fire. But what is the process?

First they would cast in plaster. Next the plaster casting would be used to make a new mold using sand. This is done in a Sandbox! The plaster pattern isplaced in the box and sand is packed around it. This is special sand that can't be reused. It is mixed in a big machine with waterglass just before it is to be used. This is packed into place and CO2 it blown over it to harden it. Once this is ready the metal is heated in the furnace and then poured into the mold. It is allowed to cool 12 hrs or so (this depends on the size of the casting – bigger equals longer). Once it has cooled the sand is broken away and discarded. The castingis cooled for another 12 or so hours and then ground and polished.