Polytek Poly-Optic® 1740 Clear Urethane Resin 4lb

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Poly-Optic® 1740 Clear Urethane Resin is a two-part, mercury-free resin that cures (RTV) to a water-clear, Shore D70 plastic. This product has a simple 1A:1B mix ratio by weight or volume, ~14-minute pot life, and ~1 hour demold time at room temperature.

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 by Weight: 1A:1B
  • Mix Ratio by Volume: 1A:1B
  • Shore Hardness: D70
  • Pot Life: 14 min.
  • Demold Time: 1 hr.
  • Cured Color: Water-Clear
  • Mixed Viscosity: 400 cP
  • Specific Gravity: 1.03
  • Specific Volume: 28.5 in³/lb
  • Max. Exotherm: 210°F
  • Notes: Demold time varies with thickness of casting and the amount of Poly-Optic Part X Accelerator added. The thinner the casting, the longer the demold time. Shrinkage in polyurethane resins is caused by gelling while hot then cooling.  
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