Properties of Two Part Silicone Adhesives, Sealants, and Coatings

Master Bond offers a number of specialty two part silicones for bonding, sealing, protective coatings, and formed-in-place gaskets. These two part systems cure by the polymerization reaction that occurs when a curing agent is added. Master Bond's line of silicones includes high-performance elastomeric RTV silicone rubber adhesives with a unique combination of flexibility and high-temperature resistance. Because of their resistance to shock and vibration, Master Bond's two part silicones serve as excellent conformal coatings for sensitive electronic circuitry.

The flexibility inherent in Master Bond's two part silicones allows for easy repair of the adhesive after it has cured. Such “repairability” is possible even without any additional solvent. Besides for the high flexibility, these compounds resist humidity and extreme temperatures, some remaining serviceable from temperatures as low as -65°F to as high as 500°F.

Properties of Master Bond’s Two Component Silicone Systems

Master Bond two part silicone systems are designed to meet specific performance requirements. Various grades will adhere to glass, plastics, metals, and rubbers, including silicone. Specific products offer:

  • Resistance to moisture
  • Superior flexibility
  • Electrical insulation
  • Thermal and electrical conductivity
  • Fast curing
  • Corrosion resistance
  • Optical clarity
  • Resistance to extreme temperatures
  • Excellent dimensional stability
  • USP Class VI specifications for biocompatibility
  • Low shrinkage

Applications of Master Bond’s Two Part Silicone Adhesives

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

  • Bonding and sealing of medical devices
  • Heat sink attachment
  • Board coating
  • Potting modules
  • Lid and housing seals
  • LED assembly
  • Sealing sensors
  • Component attachment

Advantages of Master Bond Two Part Silicone Systems

Mater Bond two part silicone systems offer high reliability in service. They cure at room temperature and are easy to mix. This provides a cost saving over oven cured polymer compounds. Master Bond's two component silicones often can be cured in deep cross section thicknesses and are popular in encapsulation and potting applications. Two part silicones feature long term durability and have successfully withstood accelerated aging tests over long time periods. They are not affected by exposure to ultraviolet light or ozone.

Our Most Popular Two Component Silicones

Products Description
MasterSil 151Med Medical grade silicone, USP Class VI approved compound. Addition type silicone cure system. Optically clear, low outgassing. Offers ambient or elevated temperature cures. For bonding, potting and encapsulation.
MasterSil 154 Two component silver filled electrically conductive silicone compound. Tough, elastic, silicone adhesive/sealant offers superior protection against adverse environmental conditions.
MasterSil 151AO Thermally conductive silicone adhesive (thermal conductivity of 1.5 Watts/meter Kelvin), electrically isolating adhesive/sealant. Low viscosity system bonds well to a wide variety of substrates.

Packaged the Way You Need It

Two Part Silicones, Two Part, Silicone, Adhesives, Sealants, Coatings

We offer a wide array of packaging options to speed productivity, minimize waste and save energy including...

  • Quantities from grams to gallons
  • Cans, bottles and jars
  • Cartridges for manual and pneumatic guns
  • Bipaks for field service kits

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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  1. samshiao shiao samshiao shiao United States says:

    what is the cost of mastersil 151?

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