CASTING PROBLEMS

ROUGH SURFACES

Possible Fault Cause	Solution
Overheated flasks during burnout	Follow recommended burnout cycle. Ensure furnace ramp does NOT exceed 250°C/Hr. Ensure 1st stage burnout temperature is kept in the range 220°C - 250°C and is held for 4.5 hours minimum. If problem still occurs, increase hold time.
Dust on waxes or trees	Ensure once waxes or wax trees are made, they are stored in a dry, clean and dust-free atmosphere. Do NOT store waxes or trees in a dusty environment or investing room.
Metal temperature incorrect	Reduce or increase metal temperature (see burnout section).
Rough waxes	Ensure excessive talc or release agent is not used, as this will produce rough waxes and therefore rough castings.
Flask burns out too quickly	Do NOT burn out before minimum of 90 minutes after investment.
Under or over-worked	Follow the recommended mixing instructions (see product pages).
Steam de-waxed for too long	Steam de-wax for a maximum of 60 minutes at atmospheric pressure. If steam de-waxed for longer than 90 minutes, the steam will start to erode the surface of the mould. Do NOT steam de-wax in a sealed container.