CASTING PROBLEMS
BLISTERS
BLISTERS
Possible Fault Cause | Solution |
First stage burnout hold too short | Ensure first stage burnout hold time at 220°C is 4.5 hours. If problem still occurs, increase hold to 5.5 hours. |
Flasks de-wax at too high a temperature | Ensure first stage burnout temperature is kept in the range 220°C - 250°C (see burnout section). |
Flasks placed in furnace too soon after investing | Do NOT burn out before minimum 1 hour after investing. |
Flask placed too close to or touching elements | Leave a minimum of 50mm gap between flasks and elements. |