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


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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