Cause : Incorrect powder/water ratio (too much water)

REMEDY : Use correct amount of water (especially important with vacuum investing machines)

Cause : Work time of investment too long. Slurry start to set while still under vacuum.

REMEDY : Ensure the work time is fully used. Normally 8 minutes.

Cause : Casting the material with too much force.

REMEDY : For centrifugal casting, use the correct spin For vacuum casting, reduce pressure.

Cause : Moving flask too soon

REMEDY : Leave the flasks for at least 1 hour.

Cause : Moulds allowed to dry out before burn out.

REMEDY : If not burning out the same day, keep moulds wet by covering with wet sacking.

Cause : Investment too thick. Too little water.

REMEDY : Use correct powder/water ratio.

Cause : Vacuum pump/tank faulty.

REMEDY : Ensure equipment is regularly serviced and adequate for the task.

Cause : Incorrect powder/water ratio (too much water)

REMEDY : Use correct amount of water (especially important with vacuum investing machines)

Cause : Work time of investment not used up.

REMEDY : Ensure the work time is used up and slurry temperature is 20 – 30 °C.

Cause : Investment powder expired(too old)

REMEDY : Do not keep investment too long time.

Cause : Dewax soak time not long enough.

REMEDY : Extend time for dry dewax at least 3 hours (temperatures between 150 to 250°C)

Cause : Flasks dewaxed at too high temperature.

REMEDY : Do not exceed 250°C during dry de-wax. Wax will boil and erode investment surface.

Cause : Flasks put in furnace too soon after investing.

REMEDY : Leave flasks undisturbed for a minimum of one hour before de-wax.

Cause : Rough waxes.

REMEDY : Use too much powder on the rubbers.

Cause : Flasks dewaxed at too high temperature..

REMEDY : Do not exceed 250°C during dry de-wax. Wax will boil and erode investment surface.

Cause : Steam de-wax for too long..

REMEDY : Steam, de-wax for a maximum of 1 hour. Steam will erode surface of the casting.

Cause : Flasks overheated during burn out..

REMEDY : Ensure maximum burn out temperature does not exceed 750 °C

Cause : Metal temperature too hot.

REMEDY : Reduce metal casting temperature.

Cause : Usage of low quality metal.

REMEDY : Do not use more than 50% recycled alloy and ensure it is clean.

Cause : Reaction with investment temperature. (Flask temperature too hot)

REMEDY : Reduce flask temperature down, Specially on big design.

Cause : Overheating the metal.

REMEDY : Reduce metal casting temperature.

Cause : Temperature inside furnaces over.

REMEDY : Ensure the quality of Thermocouple can control temperature.

Cause : Incorrect spruing

REMEDY : Sprues should be attached to the heaviestpiece of the casting. Thereshould be sufficient sprues to ensure the casting is adequately fed.

Cause : Flask temperature too cold.

REMEDY : The flask temperature should be just hot enough to achieve complete fill.

Cause : Metal or flask temperature too cold.

REMEDY : Increase casting temperatures. If the metal or flask is too cold, the metal will freeze before completely filling the mould.

Cause : Improperly sprued.

REMEDY : the sprue system should be designed to allow the metal to enter easily and without restriction.