Master Bond’s EP93AOFR is a two-part thermally conductive epoxy adhesive that offers superior heat dissipation for a wide range of electronic applications. It can be used in encapsulation and potting applications, as well as in bonding, sealing, and coating.
According to Rohit Ramnath, Senior Product Engineer, “This flame retardant non-halogenated system is not only thermally conductive, 9-10 BTU•in/ft2•hr•°F [1.30-1.44 W/(m•K)], but it is also a reliable electrical insulator with a volume resistivity greater than 1014ohm-cm.
EP93AOFR is a specialty product that is used primarily in avionics. Electronic assemblies such as power conversion units, distribution instruments, and cooling devices require first-rate protection from flames and heat. Also, they often need to transfer heat to avoid damaging components. EP93AOFR is effective in conducting heat and providing protection from flames. It should be noted that EP93AOFR is a non-halogenated system, which is highly desirable for handling and environmental issues.
This material has met and exceeded the requirements for the Federal Aviation Regulations (FAR) Standard 14 CFR 25.853(a) vertical ignition test typically used for determining material compatibility for various components inside aircraft. During the test castings of the epoxy, EP93AOFR were exposed to flames for 60 seconds. The results show that it took under 4 seconds to extinguish the flames, well under the allotted 15 seconds permitted by the test. The second part of this test measures how far the flame spreads. EP93AOFR exhibited a burn length of just 1.2 inches, well under the maximum allowed of 6 inches.
EP93AOFR bonds well to a variety of different substrates including metals, composites, glass, ceramic, FR4, and other plastics. It has an easy to use 1:1 mix ratio by weight and a good flow profile with a mixed viscosity of 30,000-150,000 cps. It is serviceable from -80°F to +300°F [-62°C to +149°C] and offers good chemical resistance to water, fuels, oils, and many common solvents. This system is available for use in ounce, ½ pint, pint, quart, and gallon kits. It can also be purchased in premixed and frozen syringes.