How Does RTV Work?
The RTV mold is created from a master pattern, typically an RP model. The pattern is used to create a silicone rubber mold. The silicone is poured around the pattern to produce a core and cavity of a mold. The RP model is then removed, leaving a negative image into which polyurethane is cast. These molds can produce up to 20 parts per mold, and they can be made as family or multi-cavity molds. When is RTV Molding useful for rapid prototyping? RTV is very helpful when you need a spec-like material for multiple sets, in a short timeframe, for less than a traditional tool would cost. Materials The materials that can be cast in a rubber mold are two-part polyurethane, silicone rubber and wax. Typically urethane is used due to its many material properties. A prototype material can be chosen to match the hardness of your production material, from 10 shore A to 80 shore D, giving the prototype the same “feel” as a production part. Today’s urethanes can withstand heat up to 220 degrees F. The
