Rubber Plaster Molding - Rapid Prototyping - Rapid Tooling

Rubber Plaster Molding (RPM), also known as plaster mold casting, offers an alternative to investment casting, sand casting and prototype die casting. This process is suitable for both prototype and short run production quantities of aluminum and zinc parts.

The plaster casting process begins with a positive SLA model of the entire assembly being built, which is used as a master pattern to make a negative silicone rubber mold. Another type of silicone rubber is poured into the previously prepared negative rubber mold to form a silicone rubber part of the same positive geometry as the master SLA pattern. A plaster mold is then created around this silicone pattern. The silicone pattern is removed and metal is cast into the cavity.