Epoxacast 690 UV Resistant Optical Clear Cast Type Epoxy Resin

Epoxacast 690 UV Resistant Optical Clear Cast Type Epoxy Resin

Areas of Use

EpoxAcast® 690;  is a UV resistant, clear casting epoxy that can be used in applications requiring hard and clear results, such as making replacement glasses for jewelry/beads and model cars. EpoxAcast® 690 can be tinted with SO-Strong® hues.

EpoxAcast® 690;  is also ideal for making clear molds and prototype parts. Castings cure with very little shrinkage and become very hard and strong.

EpoxAcast® 690;  is also suitable for electronic assembly encapsulation applications where component identification is required. Recommended casting thickness maximum; 3/8 inch / 0.95 cm.

General Features

  • Optically clear
  • UV resistant
  • Ideal for lenses or encapsulation


IMPORTANT: Gently apply the release agent to all surfaces of the model with a soft brush to apply it thoroughly over the entire area. Then apply a thin spray coat and let dry for 30 minutes.


Measurement / Distribution - Correct mixing ratio; 100 parts by weight EpoxAcast® 690 resin to 30 parts hardener. To accurately weigh these ingredients, you must use an accurate scale (precision scale or triple arm scale). Do not measure components by volume.

Technical Specifications

  • Specific Gravity: 1.10 g/cc
  • Specific Volume: 1.56 m3/kg (25 cu. in./lb.)
  • Mixture Life: 5 hours
  • Curing Time: 24 hours
  • Shore Hardness: 80 D
  • Tensile Strength: 0.457 Bar (6,630 psi)
  • Drain Factor: 39.43 Bar (572,000 psi)
  • Bending Strength: 0.757 Bar (10.980 psi)
  • Bending Factor: 28.26 Bar (410,000 psi)
  • Compression Strength: 0.662 Bar (9,610 psi)
  • Coefficient of Compression: 6.294 Bar (91,300 psi)
  • Withdrawal: 0.002'in. / in.
  • Mix ratios by weight: 100A:30B
  • Color: Clear
  • Mixture Viscosity: 280 cps
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