Posted by Thomas Lynn on November 28, 1996 at 02:55:02:
In Reply to: ceramic shell casting-core material posted by chris on November 09, 1996 at 23:23:08:
: Does anyone know if there has been a material developed
: for use in a constricted core that can be easily
: removed when casting bronze with ceramic shell?
Try coring the wax while still in mould (plaster or rubber)
with a mix of plaster and calcied flint clay, remove mould and ceramic shell as usual.Be carefull of kiln temp. as the plaster and grog mix will begin to break down at 800 degrees c.