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2C Addition Curing Silicone Gel for Sealing & Potting Applications – Master Bond

Published on 2018-02-23. Author : SpecialChem

TAGS:  Sealants    

Master Bond MasterSil 170 Gel is a two component system with excellent flowability for potting and encapsulation applications. It possesses a low mixed viscosity of 1,000 cps, has a long working life after mixing (2-4 hours for 100 g batch), a low exotherm upon cure and is easy to dispense. This solvent free silicone product does not require exposure to air for cross-linking. It has a convenient one to one mix ratio by weight and will cure at 75°F or more quickly at elevated temperatures.

Master Bond MasterSil 170 Gel
Master Bond MasterSil 170 Gel

Key Features


  • Super soft upon curing
  • Convenient handling
  • Great optical clarity
  • Superb electrical insulator

Rohit Ramnath, Senior Product Engineer:

“MasterSil 170 Gel has excellent optical clarity. It has a low refractive index of 1.42. Additionally, it exhibits outstanding electrical insulation properties, can cure in thicknesses beyond 1 inch, protects sensitive electronic/optical components against thermal stresses. Most notable for MasterSil 170 Gel is the ability it offers to retrieve delicate components after cure.”

Product Advantages


  • Addition cured; no by-products released during cure; does not require air for curing
  • Low exotherm; very long pot life
  • Can cure in thicknesses beyond 1 inch
  • Very low shrinkage upon cure
  • Excellent optical clarity and transmission properties
  • Superior electrical insulation properties; highly resistant to water

This versatile composition is highly resistant to water, is able to withstand severe thermal cycling without cracking and has extremely low shrinkage upon cure. This soft, pliable and compliant silicone system is repairable and its hardness penetration is 65 mm. MasterSil 170 Gel is available for use in ½ pint, pint, quart, gallon and 5 gallon kit containers. Shelf life in original, unopened containers at 75°F is 6 months.


Source: Master Bond
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