GC EUROPE Fujivest Super - Manual (Page 17)

17
Focus Edition from GC
2.4.3 Preparation prior to burnout
The investment material at the top of the investment ring will normally have a smooth ‘glazed’
appearance; this must be scraped with a sharp knife to create a slightly roughened porous surface.
This allows for an easier escape of gases during both the burnout and casting procedures. Failure to
undertake this procedure may cause cracking due to a build up of pressure and lead to miscasting.
The use of a model trimmer for this process is to be discouraged as the quartz and cristobalite particles
within the investment will cause rapid wear of the diamond disc.