Polymer Systems
Technology Limited

Advanced Engineering



Potting and Encapsulating Elastomers

Optically Clear Primerless Silicone Encapsulant

  • 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)


6 Months

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


The warranty period provided by Polymer systems Technology ltd (hereinafter “PST”) is from the date of shipment when stored below 40°C in original unopened containers. Unless PST provides a specific written warranty of fitness for a particular use, PST’s sole warranty is that the product will meet PST’s then current specification. PST specifically disclaims all other expressed or implied warranties, including, but not limited to, warranties of merchantability and fitness for use. The exclusive remedy and PST’s sole liability for Packaging Warranty 50 mL Side-by-Side Kit 200 mL Side-by-Side Kit 400 ml Side-by-Side Kit 2 Pint Kit (910 g) 2 Gallon Kit (7.28 kg) 10 Gallon Kit (36.4 kg), Inc. All rights reserved. Trademarks are owned by PST or its affiliates unless otherwise noted. breach of warranty is limited to refund of purchase price or replacement of any product shown to be other than as warranted. PST expressly disclaims any liability for incidental or consequential damages.



PST believes, to the best of its knowledge, that the information and data contained herein are accurate and reliable. The user is responsible to determine the material’s suitability and safety of use. NuSil Technology cannot know each application’s specific requirements and hereby notifies the user that it has not tested or determined this material’s suitability or safety for use in any application. The user is responsible to adequately test and determine the safety and suitability for their application and NuSil Technology makes no warranty concerning fitness for any use or purpose. PST has completed no testing to establish safety of use in any medical application. PST has tested this material only to determine if the product meets the applicable specifications. (Please contact PST for assistance and recommendations when establishing specifications.) When considering the use of PST products in a particular application, review the latest Material Safety Data Sheet and contact PST with any questions about product safety information. Do not use any chemical in a food, drug, cosmetic, or medical application or process until having determined the safety and legality of the use. The user is responsible to meet the requirements of the U.S. Food and Drug Administration (FDA) and any other regulatory agencies. Before handling any other materials mentioned in the text, the user is advised to obtain available product safety information and take the necessary steps to ensure safety of use.



PST disclaims any expressed or implied warranty against the infringement of any domestic or international patent/intellectual property right. PST does not warrant the use or sale of the products described herein will not infringe the claims of any domestic or international patent/intellectual property right covering the product itself, its use in combination with other products, or its use in the operation of any process.


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