| Usually
caused by |
Cured
by |
|
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 beginning to set while still
under vacuum.
|
Ensure
the work cycle is not too long and slurry temperature is 20-
22oC
|