InterPRO offers urethane castings – plastic parts with material properties similar to engineered production plastics. This bridge-tooling method is often used to span the low volume step between prototypes and production. RTV (Room Temperature Vulcanized) Tooling and Urethane Casting are when parts are cast from liquid plastic into low-cost room temperature vulcanized rubber molds.
Benefits of Urethane Casting
Fast delivery and low cost compared to injection molding
Functional prototypes with complex features
Wide range of material properties
Cast-in colors blended to spec
Accuracy on par with rapid prototypes
Zero draft / small undercuts not a problem
Shore A, Shore D, bio-compatible, flame-resistant, UL rated and clear materials
Inserts can be cast into the part for maximum strength
Cast Urethane Materials
Elastomer (Shore A 25)
Elastomer (Shore A 32)
Elastomer (Shore A 42)
Elastomer (Shore A 50)
Elastomer (Shore A 60)
Elastomer (Shore A 70)
Elastomer (Shore A 80)
Elastomer (Shore A 90)
Fire Retardant (UL 94 V0 Flammability Rating)
Cast Urethane Process
To produce molds using the Urethane Casting process a master pattern is made with Rapid Prototyping or CNC. The master pattern can be finished with texturing which will be reflected in the cast parts. Liquid silicone rubber is poured around the master pattern. The mold, once cured, is cut open to remove the master pattern. The mold is then used to cast the urethane parts.
InterPRO casts all parts under computer control in a vacuum. The result is void-free castings with consistent properties. Gates, sprues and parting lines are placed specifically to optimize the final parts. Colors are cast in to match specifications. Paint, texturing and/or graphics can be added to mimic the properties of injection molded parts.