Polymer Systems
Technology Limited

Advanced Engineering




Optically Clear Silicone Gel

  • Two-part, 1:1 Mix Ratio (Part A: Part B)
  • 1.52 refractive index for matching BK7
  • Cures with heat via addition-cure chemistry and will cure at room temperature
  • For protection of sensitive photonics assemblies from mechanical shock, thermal shock, dust, and ambient atmosphere.
  • Low viscosity reduces voids in complex assemblies to fill in and permits time for any trapped air bubbles to float to the fluid surface and escape.
  • For applications requiring optically clear materials with a refractive index of 1.52 at 589 nm
  • For LEDs and display assembly
Typical PropertiesResult
Viscosity (initial Part A and Part B mixed)360 cP
Viscosity at 3 hours after catalyzation< 4,000 cP
Cured: 30 minutes at 150°C (302°F)
Durometer, Type 0025
Specific Gravity1.07
Refractive Index, 589 nm1.52
Moisture Absorption, % gain after 168 hour exposure at 85°C (185°F) / 85% R.H. < 0.2 %
Cured: 24 hours at ambient temperature and humidity 
Durometer, Type 00065
Transmittance vs. Wavelength (25°C)*See Appendix
Refractive Index vs. Wavelength (25°C)* See Appendix
Refractive Index vs. Temperature by Wavelength* See Appendix

Recommended Primers CF2-135 - SP-120 - SP-271

Note: Some bonding applications may require the use of a primer.
CF2-135 is recommended for most metallic substrates, some plastics and when cure inhibition is observed on substrate.
SP-120 is recommended for PPA and SP-271 is recommended for PMMA.


50 ml SxS Kit
2 Pint Kit (910 g)
2 Gallon Kit (7.28 kg)


12 Months

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


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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