High Temperature Resistant, Optically Clear, Two Part Epoxy


With a volume resistivity exceeding 3x1014 ohm-cm at ambient temperatures, the EP121CL-LO two-part epoxy is used for potting, encapsulation, coating and sealing applications. When used as a coating, this electrical insulator can be conveniently applied with a spatula, knife, trowel, brush, paint roller, etc.

It adheres to metals, composites, glass, rubber and most plastics and is widely used for applications in OEMs and the aerospace industry, passing the ASTM E595 test for NASA low outgassing specifications.


  • Low mixed viscosity of 1,000-3,000 cps with a mix ratio of 100:80 by weight
  • 2-3 days at room temperature in a 100 gram batch
  • Requires oven curing
  • High tensile strength: >12,000 psi
  • Tensile modulus >450,000 psi
  • Compressive strength: >15,000 psi
  • Resists water, oils, acids, bases, fuels and many solvents
  • Refractive index: 1.56.
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