I want to lost wax cast some small statuary in cast iron - this same
item I have previously cast in bronze using the following investment
casting plaster (which I still have a 50 lb bag of):
I don't think that it'll take the higher temperature of cast iron
(1550 deg C pouring temp as opposed to about 1200 for the bronze) so
was considering using fine silica sand & sodium silicate both of which
I have to hand.
Once the bulk of the wax is steamed out of a plaster investment it is
then put in a burn out kiln to remove all traces of the wax and water,
and I would have to do the same with the sodium silicated sand, but
will this burn out the wax and leave a porous matrix as in the
investment plaster ? Obviously any wax trapped in the mould could be
potentially explosive when the iron enters so any informed opinions
would be appreciated.
15 years ago