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Master Bond’s New 2K Epoxy System Features Low Coefficient of Thermal Expansion

Published on 2018-01-31. Author : SpecialChem

TAGS:  Reactive Adhesives     Epoxy Adhesives    

Master Bond EP42HT-3AO is a two component, moderate viscosity epoxy system with good flow properties.


Product Properties


  • It is ideal for small to moderate size encapsulating, potting and casting applications.
  • It is also effective in bonding fragile components requiring a low coefficient of thermal expansion.
  • EP42HT-3AO is designed to optimize heat dissipation properties, improve the quality and reliability of electronic devices subjected to thermo-mechanical stresses.

Master Bond EP42HT-3AO
Master Bond Unveils EP42HT-3AO

Some more Features


  • This compound combines a low CTE of 13-16x10-6 in/in/°C with a high glass transition temperature (Tg) of 140-150°C. 
  • It has a thermal conductivity of 11-12 BTU•in/ft²•hr•°F [1.59-1.73 W/(m•K)].
  • It also exhibits low shrinkage upon curing, dimensional stability, and excellent structural strength.
  • EP42HT-3AO is a reliable electrical insulator with a volume resistivity of >1014 ohm-cm. 
  • This system is serviceable from -100°F to +400°F.

This 100% reactive epoxy formulation has a non-critical 100 to 40 mix ratio by weight and a working life of 60-90 minutes after mixing for a 100 gram batch at 75°F. It has a recommended cure schedule of overnight at room temperature, followed by 2-3 hours at 150-200°F. EP42HT-3AO is available for use in ounce, ½ pint, pint, quart and gallon kit containers. Specialty packaging options in the form of pre-mixed and frozen syringes are also available. The specialty packaging allows for automated dispensing. The color of Part A is white and Part B is off-white.


Source: Master Bond
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