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Urethane Casting
Urethane casting provides end-use, rigid plastic, rubber, and silicone parts with production-level quality. Ucodo is a leader in urethane casting services, with domestic (US-based) and international economy options to fit your timeline and budget; pricing includes tariffs for prototypes. Urethane gives professional results for low-volume production using a soft-tooling approach, utilizing 3D-printed master patterns and RTV silicone molds.
Cast urethane parts are ideal when color, surface quality, and toughness are required for quantities from one to one hundred. Urethane molding is a perfect alternative for insert molding or overmolding in low volumes with diverse material choices. Polyurethane or silicone casting can bridge production between a 3D printed rapid prototype and an injection molding with a balance of quality, cost, and time. Urethane cast parts can be clear, color-matched, painted (including EMI shielding), installed with inserts, and custom finished.
Urethane Casting Materials
Polyurethane is a widely used thermoset material grouping known for its strength, durability, abrasion resistance, and versatility. Different urethanes can mimic the properties of many common thermoplastics. For example, a stiff urethane cast part is “polycarbonate-like,” and a more flexible plastic may be “polypropylene-like.” We group our urethane materials into general categories to help you make quicker decisions and get the best performance on your project. The list below describes the categories of materials and technical examples when selecting polyurethanes.
Cast Silicone Materials
Silicone is not only used for making tools in casting, but it is also an excellent material for parts. Silicone is durable, stretchy, tear-resistant, inert, easy to clean, and has a high-temperature resistance. Silicone rubber can achieve ultra-soft durometers as low as Shore A 10 and up to medium-hard rubbers in the Shore A 60 range. Silicone casting is ideal for medical devices, surgical models, props, soft-touch housings, kitchen accessories, and more.
Shore A 10 (TC-5005 or equiv.)
Shore A 20-30 (TC-5130 or equiv.)
Shore A 30-40 (TC-5140 or equiv.)
Shore A 40-50 (TC-5150 or equiv.)
Shore A 50-60 (Smooth‑Sil™ 960 or equiv.)
Urethane Casting Tolerances
Typically Cast Urethane Part Tolerances
Distance Dimensions:
+/- 0.010” or +/- 0.003” per inch, whichever is larger, is typical. Irregular or overly-thick geometries may cause deviances or deflection due to shrinkage.
Shrink Mitigation:
A shrinkage rate of +0.15% can be expected due to thermal expansion of the liquid, and the response of the flexible mold.
Surface Quality:
Surface finish is externally smoothed to a satin or matte surface. Grow lines may be present on internal or difficult-to-access features. Polishing or custom finishes must be clearly defined and agreed upon at the point of order.
Feature Definition:
Sharp corners and text may appear slightly rounded.
Size Recommendation:
We can offer urethane cast parts as large as 30” (0.762 m) long.
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