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Poly-Optic® 1420 Clear Casting Resin is a two-part, liquid polyurethane resin that cures (RTV) to a water-clear, Shore D85 plastic. It cures to a tough, impact and heat-resistant plastic that can be polished and machined and is used extensively in prototyping applications. Heat cure (150°F - 180°F) is required to achieve optimum physical properties. When cured at room temperature, the result is a brittle, glass-like casting.
Vacuum and/or pressure casting techniques are recommended for this product. Cure inhibition can occur when casting this resin in tin-cured silicone rubber molds – use a platinum-cured silicone rubber mold if working with silicones.
Mix Ratio 2A:1B by weight
Shore Hardness D85
Pot Life 15 min.
Demold Time 8 hr. @150°F, 30 min. @ 175°F
Cured Color Water-Clear
Mixed Viscosity 250 cP
Specific Gravity 1.05
Specific Volume 27.5 in³/lb
Maximum Exotherm 311°F (2-lb mass)