GC EUROPE Fujivest Super - Manual (Page 35)

35
Focus Edition from GC
Cause Remedy
- Use of a soft type of investment with ring
less technique and large amount of alloy
- Either use a more robust investment
material, the ring technique, calculate the
amount of alloy required according to the
wax weight
- Air bubble in set mould - Avoid air entrapment by using a thin stream
when investing. Check the vacuum level of
the mixing devise
- Incorrect powder/liquid ratio causes a less
robust investment
- Check ratio in instructions for use the
accuracy of your measuring equipment
- The investment has been left too long after
investing
- If investment material is to be left for several
hours it is best to place it in a plastic bag or
other airtight sealed container to preserve its
humidity, prior to placing it in a burnout furnace
and heating according to the step procedure
- Crystals in liquid - Keep investment liquid bottle tightly closed,
discard contaminated liquid
- Investing under pressure - Not recommended
- Use of pre-heated furnace at high
temperature
- In case of a step heating schedule it is
advised that the initial temperature of the
furnace should be below 240°C
- Investment not thoroughly set - Mix longer, use powder and liquid stored at
correct temperature (21-23°C) or allow to set
in warmer room
- Insufficient setting time - Lengthen the time of bench setting before
mould is placed in oven. Check the
instructions for use