FormRub 50 Liquid Rubber

FormRub 50 Liquid Rubber is a medium hardness (Shore A50) rubber in the FormRub Series. This two-part, room temperature curing polyurethane system is very low in viscosity and offers excellent tensile and tear strength properties in cured form. Molds made with FormRub 50 are ideal for high-production casting and forming of concrete. Other common casting materials include plaster, wax, and, with proper release agents, some resins and foams.

FormRub 50 molds work very well for pouring large molds or molds with challenging flow conditions. Popular applications include casting concrete countertops, sinks, complex edge strips, tabletops, detailed precast architectural panels and large pavers.

FormRub 50 offers a simple 1A:1B mix ratio and a low-viscosity mixture that easily flows across detailed models with minimal undercuts. For models with more substantial undercuts, consider FormRub 35.

Thicken FormRub 50 with PolyFiber II for brush-on application.



Mix Ratio Shore Hardness Pour Time Cured Color Mixed Viscosity Specific Volume Demold Time
1A:1B A50 10 min. Opaque Orange 800 cP 26.6 in³/lb ~16 hr.
Accessories: 74/75 Part C Softener74/75 Part X AcceleratorPolyFiber II Thickening AgentUV AdditiveTietex® FabricPoly Purge Aerosol Dry Gas


Product Literature: Technical Bulletin | Safety Data Sheets | Physical Properties Bulletin | Sealers & Release Agents Selection Guide


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