Polymer Systems
Technology Limited

Advanced Engineering




Optically Clear Encapsulation Gel

  • Two-part, low outgassing, clear silicone gel
  • 1.40 refractive index
  • Low modulus
  • Cures at room temperature or rapidly with heat
  • 1:1 Mix Ratio (Part A: Part B)
  • For protection of sensitive photonics assemblies from mechanical shock, thermal shock, dust, and ambient atmosphere
  • As an embedding or potting compound for environmental protection of electronic assemblies and components, such as LEDs
  • For applications requiring low outgassing and minimal volatile components to avoid contamination in sensitive devices
  • Extended work time allows voids in complex assemblies to fill in and permits time for any trapped air bubbles to float to the fluid surface and escape
  • UV and heat resistant
  • Handles stress during thermal cycling without cracking or delaminating
  • For applications requiring an operating temperature range of-65°C to 240°C (-85°F to 464°F)
Typical PropertiesResultMetric Conv.
Viscosity, Part A16,000 cP16,000 mPas
Viscosity, Part B8,500 cP8,500 mPas
Work Time (<2x viscosity)24 hours minimum-
Volume Resistivity, Part A1 x 1014 ohm cm minimum-
Volume Resistivity, Part B1 x 1014 ohm cm minimum-
UV/Visible Spectrophotometry at 400 nm, 1 cm path length90 %T minimum-
Refractive Index1.4-
Cured: 30 minutes at 150°C (302°F)
Penetration‡0.4 mm-
Dielectric Strength350 V/mil13.8 kV/mm
Weight Loss (1 hr at 275°C)0.8%-
Moisture Absorption, % gain after 168 hour exposure0.20 %-
at 85°C (185°F) / 85% R.H. Ionic Content, Cl< 5ppm-
Ionic Content, K< 1ppm-
Ionic Content, Na< 2 ppm-
Glass Transition (Tg)-126°C-
Coefficient of Linear Thermal Expansion (0°C to 260°C)411 ppm/°C411µm/m/°C
Refractive Index vs. Temperature, 589 nm-3.85 x 10-4 /°C-
Refractive Index vs. WavelengthSee Profile PDF for Graph-
Optical Absorption vs. WavelengthSee Profile PDF for Graph-
Optical Transmission vs. Wavelength, after UV exposureSee Profile PDF for Graph-
Optical Transmission vs. Wavelength, after 12 days at 150°CSee Profile PDF for Graph-

‡(Lab Line Penetrometer, 19.5g shaft, ¼" diameter foot, 5 seconds)


50 mL SxS Kit
50 Gram Kit
100 Gram Kit
500 Gram Kit
2 Pint Kit (910 g)


12 Months

Product Profile - Full Details Product Profile
Safety Data Sheet Material Safety Data Sheet
Example packaging
Example packaging


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