Vacuum Casting

A master model has to be created or obtained on the shelf. The master pattern can be an industrial part or one created through rapid manufacturing techniques like 3d printing or CNC machine tools. It must be ensured that the master model used has the correct dimensions so that the final casting parts have the desired dimensions as wel

Liquid silicone is used to create silicone mold. Once the master model is put inside the casting box, liquid silicone is poured all over it and then it is left to cure in an oven. The cured liquid silicone mold is then cut open and the master mold has removed that leaves behind an empty cavity. The empty cavity is of the exact shape and dimensions as the original master pattern. Silicone molds can typically be used 15-20 times. 

Now suitable resins (or polyurethane that are like rubber) are mixed to ensure that the mixture has the same properties as the industrial part. The mixture is poured into the empty cavity to form the desired finished mold or product. The resin is then cured in a vacuum so that no air bubbles are trapped.