ME Elecmetal uses a vacuum forming process (the V-process) to form sand molds with high dimensional accuracy, excellent surface finish, zero draft angle, and unlimited tool life. 

V-Process Molding 

• The V-Process uses a strong vacuum applied to free-flowing, dry, unbonded sand around patterns in airtight flasks. 

• The process uses a specially designed, strong, highly flexible polymer film to seal the open ends of the sand mold and form the mold cavity.

• The vacuum inside the mold results in a net pressure pushing in, holding the sand rigidly in the shape of the pattern,  even after the pattern is removed.