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Bubbles - Complete Spheres
Figure 20: bubbles - complete spheres
Investment too thick. Too little water.
Use correct powder / water ratio.
Vacuum pump/ tank faulty.
Ensure equipment is regularly serviced
and adequate for the task.
Work cycle too long. Investment begin-
ning to set while still under vacuum.
Ensuring the work cycle is not too long
and slurry temperature is 20 – 22 ºC.
Release vacuum after full-filled flask.
Bubbles-Incomplete Spheres
Figure 21: bubbles - incomplete spheres
Static electricity on waxes.
Use a wax wash. NOTE: THE WAX
MUST BE COMPLETELY DRY BE-
FORE INVESTING.
Grease or dirt on waxes.
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