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

Cutting-Edge Formulations

The Master Bond product line consists of advanced epoxies, silicones, polyurethanes, polysulfides, UV/LED cures, and other specialty systems. Each compound is designed to meet specific application requirements. Master bond’s environmentally friendly systems are available in convenient packaging from small to large sizes.

Outstanding Technical Support

With years of experience in technical support, the Master Bond team will be able to assess your application and recommend the most suitable polymer system to meet your specifications. Master Bond will continue to guide you throughout the design, prototype and manufacturing process. Master Bond offers replacements for discontinued products.

Latest Technological Advancements

As a worldwide manufacturer of polymer compounds, Master Bond is continuously working with universities and R&D labs to improve product performance. Master Bond products are designed to maximize productivity, reduce waste, save energy, and for dependable, long-term durability.

About Master Bond

Master Bond is a leading adhesive manufacturer offering high quality adhesives, sealants, coatings and potting compounds. Master Bond’s product line consists of epoxy adhesives, polyurethane, silicone, cyanoacrylate and latex adhesives. Master Bond’s structural adhesives offer design flexibility and provide excellent bonding performance with a vast array of 3000 custom designed adhesive formulations.

Adhesive properties differ in viscosity, cure speed, chemical and temperature resistance, strength, electrical and thermal conductivity. Specific adhesive systems can be designed to meet USP Class VI certification for medical use or NASA requirements for low outgassing. Master Bond products are successfully implemented in medical, optical, aerospace, electronic, and other hi-tech industries.

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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