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Metal adhesives

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Master Bond EP40TC Two component, thermally conductive, electrically insulative epoxy system
Categories: Polymer; Thermoset; Epoxy; Epoxy, Thermally Conductive

Material Notes: Key Features:
  • Easy to use
  • Exceptional toughness
  • Excellent bond strength
  • NASA low outgassing
Product Description: Master Bond EP40TC is a two component, thermally conductive, electrically isolating epoxy for bonding and sealing. It combines convenient processing with superior strength properties after curing. It is a moderate viscosity, flowable system with a forgiving 1 to 1 mix ratio by weight or volume, and a user friendly working life. EP40TC cures readily at ambient temperatures or more rapidly with heat. The optimum cure schedule is overnight at room temperature followed by 3-5 hours at 125°F to 150°F. The system has no solvents or diluents and offers low shrinkage upon curing. This epoxy bonds well to a wide range of substrates including metals, ceramics, composites and many plastics. Most compelling is its exceptionally high shear and peel strength. EP40TC has remarkable toughness as indicated by its high elongation of 60-70%. This translates into the ability to withstand the most rigorous thermal cycling as well as vibration and shock. It is able to transfer heat, without conducting electricity. In fact, the particle size of the filler material is notably small, the largest being 12-14 microns, with an average size of 3-4 microns. This allows for particularly thin bond lines which lowers thermal resistance. EP40TC has good chemical resistance to water, oils, cleaning agents, and fuels. The color of Part A is light gray and Part B is gray. The service temperature range is -100°F to +300°F. EP40TC is an intriguing option in a variety of applications where the profile outline above is desirable. These include high strength structural bonding, where the parts are subjected to aggressive thermal cycling. Other uses would be as hermetic seals in electronic packaging, in bonding, sealing and high vacuum environments, and bonding in semiconductor and battery applications.

Product Advantages:

  • Easy processing, 1:1 mix ratio
  • Long open time
  • Outstanding shear and peel strength
  • Very high elongation
  • Vacuum compatible

Information provided by Master Bond.

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 40000 - 80000 cPPart B, thixotropic
 80000 - 100000 cPMixed
 150000 - 250000 cPPart A, thixotropic
 
Mechanical PropertiesOriginal ValueComments
Hardness, Shore D 70 - 80
Tensile Strength 1000 - 2000 psi
Elongation at Break 60 - 70 %
Tensile Modulus 5000 - 15000 psi
Adhesive Bond Strength 2300 - 2500 psiTensile lap shear, Al to Al
Peel Strength 40.0 - 60.0 pliT-peel strength, steel to steel
 
Electrical PropertiesOriginal ValueComments
Volume Resistivity >= 1.00e+15 ohm-cm
Dielectric Constant 4.4
@Frequency 60 Hz
 
Thermal PropertiesOriginal ValueComments
CTE, linear 40.0 - 45.0 µm/m-°C
Thermal Conductivity 8.00 - 11.0 BTU-in/hr-ft²-°F
Maximum Service Temperature, Air 300 °F
Minimum Service Temperature, Air -100 °F
 
Processing PropertiesOriginal ValueComments
Cure Time 3.00 - 5.00 hour
@Temperature 51.7 - 65.6 °C
Optimal: overnight at 75°F, plus 3-5 hours at 125-150°F
 48.0 - 72.0 hour
@Temperature 23.9 °C
Option 2
Working Life 2.00 - 3.00 hourafter mixing, 100 gram batch
Shelf Life 6.00 Monthin syringes, in original, unopened containers
 12.0 Monthin cans, in original, unopened containers
 
Descriptive Properties
Mixing ratio1:1 by weight or volumePart A to B

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PMASTM5922 / 306811

Metal adhesives

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