GC EUROPE Fujivest Super - Manual (Page 33)

33
Focus Edition from GC
Cause Remedy
- Entrapment of loose investment particles - Ensure that the pattern and sprueing system
contain no sharp edges. Inspect the sprue
hole for sharp edges, trim them away and
thoroughly clean the area before placing
into the furnace.
Make sure that the junction between sprue
and wax pattern is smooth and correctly
connected. Do not re-cast alloy that has
been contaminated with investment particles
- Crystals in expansion liquid - Keep investment liquid bottle tightly closed,
discard contaminated liquid
- Incorrect sprueing - Review your pattern construction & sprueing
techniques
- Incomplete burnout - Increase burnout time and/or burnout
temperature to ensure complete elimination
of the pattern material
- Absorption of gases into alloy melt during
the casting process
- Use at least 50% fresh alloy check your alloy
melting equipment and technique
- Use of carbon containing investment
material
- Use carbon-free investment material
- Water quality (contamination) - Use distilled water to dilute the expansion
liquid