RTV / Cast Models

Cast Urethane Models are a good alternative for higher quantities and can offer material properties for more demanding applications.


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“The people at Realize have become an integral part of our design team.  Whether we have needed last minute emergency parts to take to the wind tunnel or complex assemblies to confirm concept functionality, Realize has worked with us to produce lightning fast and consistently highest-quality prototypes.  The staff is responsive and always a pleasure to work with.  There is no one we would rather go to for our rapid prototyping needs.”

Design Engineer, Zipp Speed Weaponry

RTV and Cast Urethane Models

Many projects require a higher quantity of prototype models, or perhaps a more plastic-like material. Silicone rubber tooling is an excellent, more traditional and cost effective method to consider when these types of projects arise. Depending on part complexity, one RTV tool has the capability of producing as many as 25 cast urethane models. There is a wide array of urethanes from which to choose. Urethanes can be clear, colored, rigid, soft, high-impact or temperature resistant. It is even possible to insert metal components into the cast urethane models. These attributes can lead to a high-quality, semi-functional prototype that more closely simulates your end product.

Our process begins by creating a 3D Printed master model which is highly finished. The pattern is then encapsulated by a thick, liquid silicone rubber. Once cured, the silicone rubber mold is delicately cut open to reveal and extract the original pattern. Urethane is typically used to fill the mold creating a prototype model of your part. This can be done until the mold loses viability, which is dependent upon several factors, including part geometry and type of urethane. The RTV process is truly an art.

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