MasterSil 153AO Silicone Adhesive


MasterSil 153AO is an addition-cured two-part silicone with a self-priming property and a high tensile lap shear strength. The system is thermally conductive and electrically insulating.


This silicone product has an elongation between 100 to 120%, and a tensile lap shear strength of 700 to 800 psi. It provides a thermal conductivity of 0.93 to 1.08 W/(m•K), a volume resistivity of more than 1014 ohm-cm, a coefficient of thermal expansion of 150-180 x 10-6 in/in/°C, and hardness of 65-75 Shore A. It is serviceable over the temperature range of -65° to +400°F.


With an easy-to-use mix ratio of 1 to 1 by weight, MasterSil 153AO cures with the addition of moderate amounts of heat. For example, optimal cure schedule is overnight at room temperature followed by 2-4 hours at 135°F-185°F. Upon mixing, it retains its smooth paste consistency and minimal flow. It has a long working life of 4 to 6 hours for a 100-gram mass at 75°F.


This compound bonds well to a variety of substrates including metals, glass, ceramics, many plastics, and silicone rubbers. It is available for use in kits, with sizes ranging from ½ pint, pint, quart to gallons. MasterSil 153AO is generically low outgassing, contains no solvents, has low linear shrinkage upon curing, and is RoHS compliant.


This flexible system can be used in electric vehicles, as well as other applications involving sensitive optical and electronic components, where heat dissipation along with electrical insulation is critical.


  • Paste consistency
  • Long open time
  • High temperature resistant
  • Remarkable adhesive properties
  • Addition cured, no by-products released during cure, does not require air for curing
  • Convenient handling, 1:1 mix ratio by weight
  • Several curing schedule options are available
  • Very low shrinkage upon curing
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