• Two-part, low viscosity clear RTV silicone
  • Based on a dimethyl-diphenyl copolymer with a broad operating temperature range
  • 10:1 Mix Ratio (Part A:B)


  • For bonding, casting or injection molding of high performance optical components
  • For applications requiring index matching at 1.43
  • For photonics applications requiring low outgassing and minimal volatile condensables to avoid condensation in sensitive devices
  • For applications requiring an operating temperature range of -115°C to 260°C (-178°F to 500°F)

Product Details

Property Average Result
Cure System Platinum
Viscosity 5,500 cP (5,500 mPa*s)
Durometer 40 Type A
Tensile 600 psi (4.14 MPa)
Elongation 125 %
Appearance Translucent
Cure 4 hours / 65 °C
Dielectric Strength 550 volts/mil (21.45 kV/mm)
Ionic Content Cl <5 ppm
Ionic Content K <1 ppm
Ionic Content Na <1 ppm
Lap Shear 180 psi (1.24 MPa)
Mix Ratio 10:1
Operating Temperature -115 °C / 260 °C
Refractive Index 1.43
Specific Gravity 1.04
Volume Resistivity 1,100,000,000,000,000 ohmcm
Work Time 2 hours
Comment Low Volatility, 1.43 Refractive Index at 589nm. For applications requiring a broader operating temperature range. 180 psi (1.2 MPa), primed (LS1-3200) lap shear.

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For over 40 years, the NuSil brand has offered a wide range of high-purity silicones. Our team is ready to collaborate with you to provide silicone solutions to satisfy your unique requirements. For additional guidance during your selection process, or to order a sample, contact NuSil today.

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The test data shown for this material is the average value for typical properties. All of these properties may not be tested on a lot to lot basis and cannot be used to draft specifications. Please contact NuSil for assistance and recommendations in establishing limits for product specifications.