Flashing

Incorrect Water or Powder Ratio

Ensure Correct Ratio P:W
Conventional Mix  40:100
Vacuum Mix  38:100

Incorrect Burnout Cycle

Follow recommended burnout cycle.
Ensure furnace ramp does NOT exceed 250ºC/Hr.
Ensure 1st stage burnout does NOT exceed 240ºC and is held for 4.5 hours minimum. If problem still occurs increase hold time.

Excessive Casting Forces

Centrifugal casting: Lower torque and RPM settings.
Vacuum casting: Reduce over pressure.

Disturbed Flask during setting

After investing bench set and do NOT move flask, strip base or remove tape for a minimum of 90 minutes.

Over working investment

Ensure all flasks are poured and removed from vacuum tank and put on bench to set by max. 9 minutes from starting mixing.

Waxes too close

Waxes too close together creating a very thin wall of investment. Waxes too close to side or top of flask; ensure min. 5mm gap to top and sides of flask.

Slurry too hot or cold 

Adjust slurry temperature to 21ºC +/- 1ºC by increasing or decreasing water temperature.

Moulds dried out before burnout

If flasks are left on bench for more than 4 hours before burnout place a damp towel over the tops of the flasks to stop them drying out. Do NOT leave flasks in furnace overnight before burnout.

Flask base leak during investing

Ensure good seal between wax sprue and base. It is suggested that it be sealed with molten wax.