RTV Molding or Polyurethane's refers to
a low volume production method that produces parts from a Polyurethane
plastic material for prototyping purposes. These parts are similar
to and sometimes can mimics plastic injected parts.
The method behind producing Polyurethane
parts is relatively old as compared to Rapid Prototyping however;
the advent of Rapid Prototyped models introduced a new method of
producing patterns for RTV Molding.
The first step in creating Polyurethane
parts is to produce a master pattern. Anything can be used as a
pattern however, for products that do not exist yet from production
tooling, SLA, SLS, FDM or CNC models are typically used. The master
pattern is finished to a high level via sanding and priming. The
finish level of the master represents the finish level of the final
Next, the master pattern is encased in
RTV (Room Temperature Vulcanization) Silicone. When the RTV cures,
it is split and the master pattern is removed, revealing a cavity
into which Polyurethane can be cast.
Polyurethane is used for this process
because it requires low pressure and is a cold cast mixture. Typically,
it is multiple component mixture that once mixed, is poured into
the cavity where it cures to the shape of the cavity.
Polyurethane's come in many varieties
and colors allowing simulation of virtually any production material.
It is possible to simulate anything that is possible in production.
There are many uses for Polyurethane components
and is often a valued step in the engineering process. With their
advanced material properties and endless array of colors and finishes,
they offer a level of testing and simulation above traditional Rapid
If you have further questions about Polyurethane
parts or wish to have a quotation produced for a project, please
contact our Customer Service Department at [email protected]
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