Polymer Systems
Technology Limited

Advanced Engineering



Potting and Encapsulating Elastomers

Optically Clear Primerless Silicone Encapsulant

  • Two Part, Transparent, 1:1 Mix ratio (A:B)
  • Low volatility and high purity
  • High tensile strength, low viscosity
  • REACh and RoHS compliant
  • Tested per UL-94 and passed V-0
  • Requires heat to cure
  • Designed for optically harsh environments such as HighPower LED and UV LED packages
  • Generates zero defect devices (See Appendix 1)
  • Adheres to ceramic, PPA and aluminum without a primer(See Appendix 1)
  • Has excellent thermal stability (See Appendix 1)
  • Protects electrical components and assemblies against shock, vibration, moisture, dust, chemicals, and other environmental hazards
AppearanceColorless and Transparent
Viscosity, Part A 3,100 cP
Viscosity, Part B 2,300 cP
Viscosity, Mixed 3,000 cP
Cured: 60 minutes at 150°C (302°F)
Durometer, Type A 47
Tensile Strength 940 psi (6.5 MPa)
Elongation 125 %
Refractive Index at 589 nm1.41
Volatile Content (1 hour at 275°C) 0.7%
Glass Transition Temperature (Tg) *-115°C
Coefficient of Linear Expansion (-100°C to 100°C)* 330 ppm/°C (330µm/m°C)
Lap Shear to Aluminum (unprimed) 390 psi (2.7 MPa)
Die Shear 1.1 N/mm2
Dielectric Constant, 100 Hz* 2.80
Dielectric Constant, 1 kHz* 2.80
Dissipation Factor, 100 Hz*0.0004
Dissipation Factor, 100 kHz*0.0006
Dielectric Strength*660 V/ml (25.7 kV/mm)
Volume Resistivity* 1.1 X 1015 ohm cm
Ionic Content, Na *<2.5 ppm
Ionic Content, K *<2.5 ppm
Ionic Content, Cl*<5 ppm
Tested per UL-94 (3.7 mm average thickness)*V-0
Recommended cure time guidelines at various temperatures*
T90 at 80°C85 minutes
T90 at 100°C25 minutes
T90 at 120°C18 minutes

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


50 Gram Kit
50 mL Side-by-Side Kit
2 Pint Kit (910 g)
2 Gallon Kit (7.25 kg)
10 Gallon Kit (36.4 kg)


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