Instruction manual

OPERATING_MANUAL_MC20V.DOC 18.03.11 KS Seite 37
Water marking
Cause Remedy
Incorrect powder / water ratio (too much
water).
Using correct amount of water.
(Especially important with vacuum
investing machines).
Work time of investment not used up. Ensuring the work time is used up and
slurry temperature is 20 - 22ºC.
Gas porosity
Cause Remedy
Overheating the metal. Reduce metal casting temperature.
Inadequate burn out. Increase the time at 730ºC.
Flask overheated during burn out. Ensure maximum burn out temperature
does not exceed 730ºC.
Impurities in the metal. Do not use more than 50% recycled alloy
and ensure it is clean