The master pattern is suspended inside the casting box. Cores and inserts are fitted on the inside of the master pattern. Along with the core, casting gates and risers are also placed in the casing box for pouring the molten silicone and removing the final mold respectively.

Hot, molten silicone is poured into the casting box, around the master pattern. It flows inside the master pattern, filling all the crevices of the prototype mold. The molten silicone is allowed to cure inside the casting box, which is maintained at 40*C, for about 8-16 hours.

After the silicone has solidified and the curing is completed, risers are removed and the silicone mold is taken out of the casting box. The whole process is completed under vacuum, to maintain casting deformations to a minimum