Category Archives: Urethane Casting

Urethane Casting

Low Volume Production Quality Parts

open tankThe urethane casting process is ideal for quickly producing high quality plastic/rubber parts without the cost of hard tooling. Urethane casting is a great alternative to injection molding when annual volumes are too low to justify the mold cost. Utilizing the silicone molds we are able to achieve large, complex parts in one solid piece. Urethane casting is ideal for:

Urethane parts can be nearly any shape or size, with materials ranging from flexible 5A – 90A Shore, semi-rigid 40D – 80D, and rigid fire rated and non-fire rated.

  • ABS-like – Ideal for pre-production parts and marketing samples
  • Clear – Clear urethane casting is ideal for creating transparent plastic components
  • High-Strength – Ideal for low volume production parts
  • High-Temperature – Ideal for low volume production parts in high heat applications

Benefits of Urethane Casting & RTV Molding

RTV molds are created using a master pattern. The master pattern can either be created using CNC machining or a 3D printer, such as an SLA machine. Silicone rubber is poured around the master pattern, creating a cavity and a core. The master is removed once the silicone rubber sets and leaves a void into which several materials may be cast.

RTV molding is an inexpensive way to bridge the gap between prototype and production. It is most effective when you need a short run of parts to simulate production parts. More common materials used for RTV molding are polyurethanes, wax and silicone. Polyurethane can simulate a wide range of materials from soft rubber to hard plastic.

Cast Urethane parts can produce incredible detail and excellent surface finish. Often times little finishing is required on cast Urethane parts because the details and textures are applied to the master pattern. Because of the flexibility of Silicone, reverse draft, inserts and undercuts are all easy to deal with.

Urethane casting can be used for several applications including visual models, product testing, color and texture studies and even low volume production. Urethane parts can be of nearly any size and shape and can also be color matched.

To learn more, check out this great resource for Urethane Casting and RTV Molding.

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