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Metal adhesives

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Master Bond EP21AN Room Temperature Curing Two Component Epoxy
Categories: Polymer; Thermoset; Epoxy; Epoxy, Thermally Conductive

Material Notes: Key Features:
  • Room temperature curing
  • Convenient one to one mix ratio by weight or volume
  • Exceptional electrical insulation properties
  • Outstanding thermal conductivity
  • Long working life
  • Superb dimensional stability
Product Description: Master Bond EP21AN is a two component room temperature curing epoxy adhesive, sealant and coating that combines very high thermal conductivity and superb electrical insulation properties. It has an exceptionally forgiving one to one mix ratio by weight or volume and a long working life. Although the system cures at room temperature, its physical properties are optimized by a post cure at 150°F for 2-3 hours. EP21AN adheres well to a wide variety of substrates including metals, composites, glass and many plastics. It is a reliable adhesive with a desirable low coefficient of thermal expansion. Another noteworthy feature is its very fine dimensional stability. EP21AN offers good resistance to a wide range of chemicals including water, oil, fuels, acids and bases. The temperature range is -60°F to +250°F. The color of Part A is light gray; Part B is gray in color. EP21AN can be used in electronic, aerospace, specialty OEM and other industries where extraordinary heat transfer properties, top notch electrical insulation values and wonderful dimensional stability are required.

Product Advantages:

  • Convenient mixing: non-critical equal weight or volume ratio. Long working life
  • Low coefficient of expansion, low shrinkage, superb dimensional stability
  • Versatile curing: will cure at ambient temperature, accelerated by additional heat
  • High bonding strength to a wide variety of substrates
  • High temperature resistance
  • 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 50000 - 120000 cPPart B
 90000 - 240000 cPPart A, thixotropic
 
Mechanical PropertiesOriginal ValueComments
Hardness, Shore D 85 - 90
Tensile Strength 5000 - 6000 psi
Tensile Modulus 500000 - 550000 psi
Compressive Strength 22000 - 24000 psi
Adhesive Bond Strength 900 - 1100 psiTensile lap, Aluminum to Aluminum
 
Electrical PropertiesOriginal ValueComments
Volume Resistivity >= 1.00e+15 ohm-cm
Dielectric Constant 4.6
@Frequency 60 Hz
Dielectric Strength >= 450 V/mil
@Thickness 3.17 mm
 
Thermal PropertiesOriginal ValueComments
CTE, linear 22.0 - 25.0 µm/m-°C
Thermal Conductivity 3.173 - 3.4615 W/m-K
Maximum Service Temperature, Air 250 °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 minAfter mixing, 100 g batch
Shelf Life 6.00 Month
@Temperature <=23.9 °C
in original, unopened containers
 
Descriptive Properties
Mixing Ratio1:1 by weight for volumeParts A to B

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PMASTM815 / 185408

Metal adhesives

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