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About Urethane Castings' target='_blank'>Urethane casting (or polyurethane casting) is ideal for additive manufacturing short-run production of pieces made from a' target='_blank'>plastic injection molded resin. Often performed after an RTV mold (also called a room temperature vulcanization mold) is made from a stereolithography (SLA) prototype, urethane casting is a cost-effective way to reproduce production-ready parts in small quantities.

After a mold is created, urethane casting material – synonymous with polyurethane casting material – is injected into the mold’s “void.” This allows for near-perfect copies of the original prototype to be created. We have low durometer urethanes that can be very soft, but we can also make stereolithography molds and inject silicone rubber into it.

Urethane casting provides:

  • Accuracy: A high degree of accuracy is maintained in the copy – including the surface finish.
  • Versatility: Parts without draft, or with undercuts, can be reproduced. Likewise, different materials can be used with the same mold, making it possible to test designs with a variety of material properties.
  • Speed: Several parts can be created per shift once the mold is complete.

Typical Casting Use Cases

Small-batch manufacturing Engineering design verification Alpha and beta builds
Pre-production parts


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