What are Urethane Castings?

Urethane Castings Find Providers For RTV

Cheap urethane parts are cast in a silicone mold (based on an SLA pattern). Moderate prices.
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Urethane castings allow designers to make affordable low-volume prototypes using a wide variety of materials.

How It Works
Urethane Castings start with a master pattern, usually made using SLA. The pattern is then placed in a box where silicone RTV is poured in to create a negative mold. Silicone provides a flexible, detailed surface that does not stick to most casting materials.

There is a wide variety of materials available to make castings, including urethanes, polyurethanes, epoxies, and others. They can be cheap or expensive, hard or flexible, or simulate injection molding plastic, for example. It just depends on the budget and testing requirements of the designer.

Typical Uses
  • Rapid Prototypes
  • Production Parts
Costs
Example quotes for a 2-inch sphere:
Process Qty 1 Qty 10
SLA $376 each $109 each
SLS $501 each $121 each
FDM $182 each $154 each
PolyJet $479 each $139 each
Machined Plastic $458 each $139 each
Urethane Castings N/A $120 each
So, you can see how volume discounts can be a big factor, especially for processes that are slow in the vertical direction.

For More Information
Wikipedia article

See the Next Article: Machined Plastic Parts

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