Flexible Silicone Potting and Encapsulation Compound

Master Bond MasterSil 152, a two-component condensation curing system, was created for potting and encapsulation applications where it is not possible to use an addition-cured silicone. The system requires only air for complete cross-linking. In contrast to addition-cured systems, it does not contain any substrates that could suppress the cure.

MasterSil 152

The system has low exotherm and can completely cure at ambient temperature within 24–48 hours. MasterSil 152 boasts low shrinkage once it is cured. Its mix ratio by weight is 20:1 and it has a long service life of 6–8 hours after mixing.

MasterSil 152

MasterSil 152 integrates electrical insulation properties and low viscosity with the potential to cure in sections with a thickness of more than 1 inch, rendering it most suitable for potting and encapsulation. It is optically clear, largely used in optical and electronic components, and has the ability to transmit light well from 220 to 2500 μm. Its refractive index is 1.45.

As is the case for silicones, MasterSil 152 is also very flexible and can endure shock and thermal cycling. It is extremely water-resistant and can be operated over a wide temperature range of −65 °F to +400 °F. The shelf life of this potting and encapsulation compound at ambient temperature in its original, unopened containers is six months. It comes in ½ pint, pint, quart, gallon, and 5 gallon container kits.

Applications for Master Bond Two-Part Silicone Adhesives

Master Bond two-part silicone adhesives provide high-performance and cost-effective solutions for a wide range of application requirements. Some of the most common include:

  • Heat sink attachment
  • Board coating
  • Potting modules
  • Lid and housing seals
  • LED assembly
  • Bonding and sealing appliances
  • Component attachment

This information has been sourced, reviewed and adapted from materials provided by Master Bond Inc.

For more information on this source, please visit Master Bond Inc.


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