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Metal adhesives

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Master Bond EP93AOFR Two component thermally conductive flame retardant epoxy system
Categories: Polymer; Thermoset; Epoxy; Epoxy, Thermally Conductive

Material Notes: Key Features:
  • Tested as per Amendment 25-116 and Part 25 Appendix F
  • Passes horizontal burn test
  • One to one mix ratio
  • For bonding, sealing, coating and potting
Master Bond EP93AOFR is a two component flame retardant epoxy system for bonding, sealing, coating and potting. It passes the demanding horizontal burn test. EP93AOFR has an easy to use, forgiving, one to one mix ratio by weight. This system has a long open time. The recommended curing schedule for optimizing properties is overnight at room temperature followed by 3-4 hours at 150-200°F. It is a good thermal conductor while retaining a favorable electrical insulation profile. It bonds well to a variety of substrates including metals, composites, glass, ceramic and many plastics. The service temperature range is -80°F to +300°F. It has reasonably good chemical resistance to water, fuels, oils and many common solvents. The color of Part A is black, Part B is off white and the cured material is black. 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. They often need to transfer heat to avoid damaging components. EP93AOFR is highly effective in conducting heat and providing protection from flames. EP93AOFR is a non-halogenated system, which is highly desirable for handling and environmental issues.

Product Advantages:

  • Easy to use, forgiving 1:1 mix ratio by weight
  • Long open time
  • Good flow properties; can be used for potting
  • Favorable thermal conductor and electrical insulator
  • Bonds well to many different substrates
  • Passes the horizontal burn test

Information provided by Masterbond.

Vendors: Master Bond is a leading manufacturer of adhesives, sealants, coatings and potting compounds. Master Bond’s vast product line consists of over 3,000 epoxy, polyurethane, silicone, cyanoacrylate and latex adhesives that vary in viscosity, cure speed, strength, chemical resistance, electrical properties, etc. Our custom adhesives offer design flexibility and provide excellent bonding performance. Visit www.masterbond.com.

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Physical PropertiesOriginal ValueComments
Specific Gravity 1.63 g/ccPart B
 1.67 g/ccPart A
Viscosity 30000 - 150000 cPmixed
 20000 - 200000 cPPart B
 50000 - 250000 cPPart A
 
Mechanical PropertiesOriginal ValueComments
Hardness, Shore D 80 - 85
Tensile Strength 4000 - 5000 psi
Elongation at Break 5.0 - 10 %
Tensile Modulus 350000 - 400000 psi
Adhesive Bond Strength 800 - 1000 psilap shear, Al/Al
 
Electrical PropertiesOriginal ValueComments
Volume Resistivity >= 1.00e+14 ohm-cm
Dielectric Constant 4.7
@Frequency 60 Hz
 
Thermal PropertiesOriginal ValueComments
CTE, linear 25.0 - 30.0 µm/m-°C
Thermal Conductivity 1.30 - 1.44 W/m-K
Maximum Service Temperature, Air 300 °F
Minimum Service Temperature, Air -80.0 °F
 
Processing PropertiesOriginal ValueComments
Working Life 120 - 180 minAfter mixing, 100 g batch
Shelf Life 6.00 MonthIn original unopened containers
 
Descriptive Properties
Cure scheduleovernight at room temperature followed by 3-4 hours at 150-200°F
Mixing Ratio1:1Parts A to B, by weight

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PMASTM721 / 233778

Metal adhesives

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