Polymer Systems
Technology Limited

Advanced Engineering



Potting and Encapsulating Elastomers

Optically Clear Silicone Elastomer

  • Two-part, optically clear silicone system
  • Based on a methyl silicone polymer
  • Low viscosity
  • 1:1 Mix Ratio (Part A:B)
  • Requires heat to cure
  • For bonding, casting or compression molding of high performance optical components
  • For applications requiring index matching at 1.40
  • For photonics applications requiring low volatility silicone to avoid contamination
Typical PropertiesAverage Result
AppearanceColorless and Transparent
Viscosity, Part A3,450 cP (3,450 mPas)
Viscosity, Part B2,500 cP (2,500 mPas)
Viscosity, Mixed (V1) within 30 minutes of catalyzation3,200 cP (3,200 mPas)
Viscosity, Mixed (V2) 24 hours after catalyzation3,600 cP (3,600 mPas)
Viscosity, (V2/V1) 24 hours after catalyzation1.1
UV/Visible Spectrophotometry at 400nm99%T
Cured: 60 minutes at 150°C (302°F)
Specific Gravity1.02
Durometer, Type A50
Tensile Strength900 psi (6.2 MPa)
Lap Shear Strength (primed with LS1-3200)270 psi (1.9 MPa)
Volume Resistivity*1.3 X 1015 ohm cm minimum
Dielectric Strength*630 V/mil (13.8 kV/mm)
Ionic Content, Cl*< 5ppm
Ionic Content, K*< 2.5 ppm
Ionic Content, Na*< 2.5 ppm
Glass Transition Temperature (Tg)*-115 °C (-175°F)
Coefficient of Linear Expansion (-150 °C to -120°C)*99 ppm/°C (99µm/(m°C))
Coefficient of Linear Expansion (-100 °C to 100°C)*330 ppm/°C (330µm/(m°C))
Refractive Index, 589 nm1.4
Transmittance vs. Wavelength (25°C)See Profile PDF for Graph
Refractive Index vs. Wavelength (25°C)See Profile PDF for Graph
Refractive Index vs. Temperature by WavelengthSee Profile PDF for Graph

*These properties NOT tested on a lot-to-lot basis. Please contact NuSil Technology for assistance and recommendations in establishing particular specifications.

Recommended Primer LS1-3200

Note: Some bonding applications may require the use of a primer.


50 Gram Kit
50 mL SxS Kit
500 Gram Kit
2 Pint Kit (0.91 kg)
2 Gallon Kit (7.28 kg)


12 Months

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


Medical Silicones
Biomaterials - Medical Silicones for Healthcare

Advanced Technologies

Advanced Technologies Industrial & Engineering Silicones
Space - Aviation Grade Industrial & Engineering Silicones


Food Medical Industrial Grade Silicone Tubing
Food, Medical & Industrial Quality Silicone Tubing


Silicone Mixing Dispensing Degassing Equipment
Mixing Dispensing & Degassing Equipment for Silicone