GC EUROPE Fujivest Super - Manual (Page 32)

32
Cause Remedy
- Insufficient mixing/spatulation - Mix as recommended in the instruction
manual to ensure that the complete setting
reaction occurs. Replace mixing equipment
if worn
- Rate of burnout too fast (plastic parts) - Decrease heating rate or try the step
heating procedure as detailed in the
instructions for use
- End (final) burnout temperature too high or
heat soak too long (over 1.5 hours)
- Reduce end temperature; do not hold at the
final temperature for more than 1.5 hours.
Check calibration of burn out furnace
- Overheating alloy melt - Review both the alloy and casting equipment
manufacturer’s instructions and guidelines
- Defective pattern and/or pattern material - Use only high quality pattern materials such
as GC Pattern Resin and wax taking care to
avoid contamination with debris
- Wet pattern, use of surface wetting agents - If a surface wetting agent is used ensure that
it is allowed to thoroughly dry
- Incorrect powder/liquid ratio - Use correct ratio as stated in the instructions
for use
- Impurities in wax or pattern resin - Work cleanly and ensure that the pattern
material is free of impurities
- Air bubble entrapped - Avoid air entrapment by using a thin stream
when investing
- Insufficient vacuum during mixing - Check efficiency of vacuum on mixing unit
4
Rough casting surfaces
(pits, nodules and porosities)