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Metal adhesives

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Master Bond EP21AOHT Thermally Conductive, Electrically Insulating Two Component Epoxy
Categories: Polymer; Thermoset; Epoxy; Epoxy, Thermally Conductive

Material Notes: Key Features:
  • Excellent thermal conductivity
  • Room temperature curing
  • Convenient handling
  • Superior electrical insulation
  • Long working life
  • High temperature resistance
Product Description: Master Bond EP21AOHT is a two component, thermally conductive, electrically insulating epoxy adhesive, sealant, and coating combining an excellent performance profile, user friendly processing along with higher temperature resistance properties. It is very easy to use with a forgiving one to one mix ratio by weight or volume. It cures at ambient temperatures or more rapidly at elevated temperatures with the optimum schedule being overnight at room temperature followed by a few hours at 150- 200°F. Its most outstanding feature is its superior thermal conductivity while sustaining ample electrical insulation values. EP21AOHT adheres well to a wide variety of substrates, including metals, composites, ceramics, glass, rubbers and plastics. It offers sound chemical resistance versus water, oil and fuels. Other desirable properties include minimal shrinkage upon curing, a low coefficient of thermal expansion, standout dimensional stability, first rate compressive strength and a high modulus of elasticity. Another positive is the service temperature range of -60°F to +400°F. The color of Part A is gray and Part B is off-white. EP21AOHT has a broad combination of properties where top notch heat transfer and solid electrical insulation properties along with the other attributes mentioned above are needed, particularly in aerospace, electronic and specialty OEM type applications.

Product Advantages:

  • Convenient mixing: non-critical one to one mix ratio by weight or volume; smooth consistency
  • Versatile cure schedules: ambient temperature cures or fast elevated temperature cures as required
  • High bonding strength to a wide variety of substrates
  • Low coefficient of expansion, very little shrinkage, superb dimensional stability
  • Outstanding thermal conductivity
  • Excellent electrical insulation properties

Information provided by Master Bond Inc.

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
Viscosity 35000 - 65000 cPPart A
 
Mechanical PropertiesOriginal ValueComments
Hardness, Shore D 85 - 95
Tensile Strength 6000 - 7000 psi
Tensile Modulus 500000 - 550000 psi
Compressive Strength 20000 - 23000 psi
Adhesive Bond Strength 1000 - 1200 psiTensile lap, Aluminum to Aluminum
 
Electrical PropertiesOriginal ValueComments
Volume Resistivity >= 1.00e+14 ohm-cm
Dielectric Constant 4.7
@Frequency 60 Hz
Dielectric Strength >= 400 V/mil
@Thickness 3.17 mm
 
Thermal PropertiesOriginal ValueComments
CTE, linear 21.0 - 24.0 µm/m-°C
Thermal Conductivity 1.2981 - 1.4423 W/m-K
Maximum Service Temperature, Air 400 °F
Minimum Service Temperature, Air -60.0 °F
 
Processing PropertiesOriginal ValueComments
Cure Time 2.00 - 3.00 hour
@Temperature 93.3 °C
 48.0 - 72.0 hour
@Temperature 23.9 °C
Working Life 90.0 - 120 minAfter mixing, 100 g batch
Shelf Life 6.00 Month
@Temperature <=23.9 °C
in original, unopened containers
 
Descriptive Properties
Cure ScheduleOvernight at 75°Fplus a few hours at 150-200°F, Optimum cure
Mixing Ratio1:1 by weight for volumeParts A to B

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PMASTM817 / 185410

Metal adhesives

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