Instruction manual

OPERATING_MANUAL_MC20V.DOC 18.03.11 KS Seite 33
3.20. After casting:
Most castings in gold- and silver alloys, palladium- and platinum alloys can be
quenched immediately after the 240 seconds cooling time in the machine.
Except: stone in place castings, they should cool down to room temperature.
However, some alloys need to cool for prolonged time, see datasheets of alloy suppliers.
Castings in CoCr, NiCr and steel alloys should cool down to room temperature before
removal of the flask.
For flasks with gypsum bounded Investment material:
Leave the flask 240 seconds after casting under over pressure. In this time you can
be sure that even inside of the casting metal is solid. After this 240 seconds: Quench
flask in water soon.
Caution:
For a stone-in-place-casting process: let cool down flask to room temperature!
Otherwise stones will crack!
For phosphate bonded investment material:
Wait until flask has reached room temperature. Break investment by a hammer or so.
Cleaning the tree
For removal of the remaining plaster and oxidation skin, a sand blasting cabinet is
very useful. Use of acid is dangerous and banned in most countries by government's
law.
Gypsum bonded investment: use of glass beads is good enough
For phosphate bonded investment: it is better to use corundum.