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Urethane Casting Rubber: High-Performance Material for Detailed Prototypes and Parts

When creating high-fidelity prototypes, functional parts, or short-run production items, selecting the right material is paramount. This is where Urethane Casting Resin excels. Our premium Urethane Casting Materials are engineered to deliver exceptional detail reproduction, durability, and a range of physical properties that mimic production-grade plastics and rubbers. To achieve optimal results with these advanced materials, a controlled Urethane Casting Process is essential, often supported by a reliable Urethane Casting Machine for consistent mixing and degassing, ensuring bubble-free casts every time.


Our specific formulation of Urethane Casting Rubber is a two-part, liquid polymer system designed for vacuum casting applications. It is renowned for its high tear strength, excellent abrasion resistance, and the ability to capture extremely fine details from master patterns. This Urethane Casting Rubber exhibits low viscosity for easy pouring and de-airing, along with a controllable pot life and cure time to suit various project scales and complexities. It cures at room temperature to form a solid, resilient rubber that can withstand functional testing and repeated use.

Key Physical Properties of Our Urethane Casting Rubber

  • High Tear Strength: Resists tearing and propagation of nicks or cuts.
  • Excellent Abrasion & Impact Resistance: Durable for functional parts and prototypes.
  • Superior Detail Reproduction: Captures intricate textures and fine features accurately.
  • Low Viscosity: Ensures easy mixing and de-airing, minimizing bubble entrapment.
  • Room Temperature Cure: Simplifies the casting process without requiring ovens.
  • Variable Shore Hardness: Available in a range from soft, flexible grades to semi-rigid formulations.

Detailed Technical Specifications

Property Test Method Value / Range
Mixed Viscosity Brookfield LVF 600 - 900 cPs
Pot Life (100g mass) ASTM D2471 10 - 15 minutes
Demold Time - 16 - 24 hours
Shore Hardness ASTM D2240 Shore A 20 - Shore A 80
Tensile Strength ASTM D412 450 - 600 psi
Elongation at Break ASTM D412 350 - 500%
Tear Strength (Die C) ASTM D624 80 - 120 pli
Specific Gravity ASTM D792 1.02 - 1.05
Color (as supplied) Visual Translucent, White, or Black

Recommended Mixing Ratio and Handling

Component Ratio by Weight Ratio by Volume
Part A (Resin) 100 100
Part B (Hardener) 10 - 30 10 - 30

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