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About Opti-tec 7020 Optically Clear Silicone Potting Compound

Also available to buy online at  Available at Intertronics.shop

Opti-tec™ 7020 Optically Clear Silicone Rubber Potting Compound is a two-part, clear liquid silicone elastomer which will cure at room temperature or can be accelerated at elevated temperatures. It has a low viscosity, which allows for ease of flow around complex parts, providing electrical insulation and shock resistance. Its combination of transparency, non-yellowing and compliance makes it suitable for encapsulation of sensitive electronic or opto-electronic parts (e.g. LEDs), protecting the components from vibration, moisture and atmospheric contaminants.

Features & Benefits

  • Optically clear
  • Compliant
  • Room or low temperature cure
  • Non-yellowing catalyst system
  • Low shrinkage
  • Excellent for protecting LEDs and solar applications
  • Convenient 10:1 mixing ratio for use in automatic dispensing equipment or hand mixing
  • Low viscosity which allows for ease of flow around complex parts, providing electrical insulation and shock resistance
  • Contains no solvents
  • Has a chemical composition which provides hydrolytic stability and reversion resistance. It is an addition cure silicone with a platinum catalyst.


  • Optical assemblyOpti-tec 7020 250g twinpack
  • Opto-electronics, photonics, LEDs
  • Optical encapsulation & glob topping, casting, potting
  • Solar panels
  • Electronics potting


Specification Mixed Resin Hardener
Colour Clear; colourless Clear Clear
Viscosity (mPa.s) Easily pourable 4000 500
Specific gravity 1.02 1.01
Mix ratio 10:1
Pot life (@ 23°C) 4 hours
Cure schedule (approx maximum time) 25°C – 20 hours
100°C – 60 mins
Cured properties (60 minutes @ 100°C)
Shore Hardness A40
Temperature range -60 to 200°C
Tensile strength 4.8 MPa
Elongation at break 100%
Linear shrinkage < 0.1%
CTE 275 ppm/°C
Dielectric strength 20 kV/mm
Dielectric constant 2.69 @ 1000Hz
Dissipation factor 0.0006 @ 1000Hz
Volume resistivity 1.7 x 1015 ohm-cm
Thermal conductivity 0.18 W/m K
Specific heat 1.255 kJ/kg
Refractive index 1.405
Transmittance 90.3%


Opti-tec 7020 silicone potting compound transmission curve
Transmittance of Opti-tec 7020 @ 1cm path length


Safety Data Sheets
For the latest SDS for this product, please e-mail msds@intertronics.co.uk


Opti-tec 7020 is available in twinpacks or in bulk.

For bulk, weigh 10 parts of Part A to 1 part of Part B. Allowable tolerance on the measured weight for either Part A or Part B is +/-2.5%. The mixing container should be 4 to 5 times larger than the volume of silicone. Use stainless steel, HDPE, polypropylene, etc. Using clean tools, thoroughly mix the A and B components.

Twinpack packaging

The twinpack sachet is a clear film sachet, with the resin and hardener separated by a removable clip and rail divider. Click here for twinpack mixing instructions.

Care should be taken to avoid excessive aeration. For many applications, natural degassing will be sufficient. If degassing is required, intermittently evacuate at 20-40 mbar for 15-30 minutes. Leave for a few minutes after releasing the vacuum to allow surface bubbles to collapse.

Cure begins as soon as the components are mixed in the recommended ratio. Complete cure is normally achieved in 16 to 24 hours at ambient temperatures of 20-30°C. Cure can be accelerated by heating to 50-120°C.

All Downloads

Filename Size Download
OPT 7020 Product Data Sheet 0.20MB Download

Ordering Information

Opti-tec 7020 is supplied in matched kits in a 10 to 1 ratio of Part A to Part B – standard size is 1.1kg total. Alternatively, Opti-tec 7020 is supplied in pre-weighed 250 gram twinpacks.
Opti-tec 7020 1.1 kg kitOpti-tec 7020 250g twinpack

Part number Description
Click here to buy on intertronics.shop
Optically Clear Silicone Potting Compound – 1.1 kilogram kit
Click here to buy on intertronics.shop
Optically Clear Silicone Potting Compound – 250 gram twinpack

Keep the product in clearly labelled containers.


Let’s start by talking about your application

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  • Last updated: January 2024
  • Version: 6.7

Statements, technical information and recommendations contained herein are based on tests we believe to be reliable but they are not to be construed in any manner as warrantees expressed or implied. The user shall determine the suitability of the product for his intended use and the user assumes all risk and liability whatsoever in connection therewith.