The sand has no moisture to cause steam and also no chemical binder to cause out-gassing. The mold itself is constantly under a strong vacuum. Therefore, any gasses that may be created are not trapped but are pulled out through the sand by the vacuum. The V-Process will provide a much better surface finish than a typical sand or permanent mold casting. At TPi we are running between a 125 and 150 RMS surface finish.
Most castings get a light sand blast after cleaning to give the casting a uniform appearance.
However, on some parts we can do a vibratory finish or buff and polish certain surfaces if a different surface is required. The final surface treatment and criteria generally determine the cleaning requirements. The V-Process has the advantage of using wood for the gating system. This means that the gating system, although permanent, can be easily and quickly changed since the V-Process does not cause wear to the pattern. Typically gate and vent locations are not specified on the customer's drawing.