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Metal adhesives

Master Bond EP79 Two Component, Silver Coated, Nickel Filled Conductive Epoxy
Categories: Polymer; Adhesive; Thermoset; Epoxy; Epoxy Adhesive

Material Notes: Key Features:
  • Very low volume resistivity
  • Superior toughness
  • High strength profile
  • Silver coated nickel filled system
  • Cost effectiveness
  • Superior durability, thermal cycling capabilities
Product Description: Master Bond EP79 is a two component, electrically conductive epoxy for high performance bonding, coating and sealing. Most significantly, it contains silver coated nickel as the conductive filler and can be considered a cost effective alternative to more standard silver filled epoxy systems. EP79 has a convenient one to one mix ratio by weight, and it cures readily at room temperature or more rapidly at elevated temperatures. To optimize its properties, the recommended cure schedule is overnight at room temperature followed by a post cure of 1-2 hours at 150-200°F. It has low linear shrinkage upon cure. It possesses reasonably good bond strength and has superior toughness, which allows the system to be subjected to thermal cycling and shocks. Due to the nature of the filler, it exhibits superb thermal conductivity. It is 100% reactive and does not contain any diluents or solvents. The volume resistivity is exceptionally low—less than 0.005 ohm-cm. EP79 can be applied readily with brush and has good flow properties. The system is conducive to thermal cycling over the exceptionally wide temperature range of 4K to +275°F, enabling it to be serviceable even in cryogenic applications. It has good chemical resistance to water, oils and fuels. Adhesion to metals, composites, glass, ceramics, vulcanized rubbers and many plastics is excellent. Parts A and B are both colored gray. Master Bond EP79 adhesive is widely used in the electronic, aerospace, computer, semiconductor and electro-optic industries, among others.

Product Advantages:

  • Convenient mixing: one to one ratio by weight
  • Easy application: contact pressure only required for cure; adhesive spreads evenly and smoothly
  • Versatile cure schedules: ambient temperature cures or fast elevated temperature cures as required
  • Very low volume resistivity (<0.005 ohm-cm)
  • Cost effective alternative to silver filled epoxy
  • Good bond strength to a variety of substrates

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 PropertiesMetricEnglishComments
Specific Gravity 3.55 g/cc3.55 g/ccPart B
 3.58 g/cc3.58 g/ccPart A
Linear Mold Shrinkage <= 0.0010 cm/cm<= 0.0010 in/in
 
Mechanical PropertiesMetricEnglishComments
Hardness, Shore D >= 65>= 65
Tensile Strength 34.5 MPa5000 psi
Tensile Modulus 2.76 GPa400 ksi
Adhesive Bond Strength >= 3.59 MPa>= 520 psiTensile lap, Aluminum to Aluminum
Peel Strength >= 1.75 kN/m>= 10.0 pli
 
Electrical PropertiesMetricEnglishComments
Volume Resistivity <= 0.0050 ohm-cm<= 0.0050 ohm-cm
 
Thermal PropertiesMetricEnglishComments
Thermal Conductivity 1.73 - 2.16 W/m-K12.0 - 15.0 BTU-in/hr-ft²-°F
Maximum Service Temperature, Air 135 °C275 °F
Minimum Service Temperature, Air -167 °C-269 °F
Glass Transition Temp, Tg 55.0 - 60.0 °C131 - 140 °F
 
Processing PropertiesMetricEnglishComments
Cure Time  120 - 180 min
@Temperature 93.3 °C
2.00 - 3.00 hour
@Temperature 200 °F
 2880 - 4320 min
@Temperature 23.9 °C
48.0 - 72.0 hour
@Temperature 75.0 °F
Working Life 5.00 - 7.00 min5.00 - 7.00 minAfter mixing, 100 g batch
Shelf Life 3.00 - 6.00 Month
@Temperature <=23.9 °C
3.00 - 6.00 Month
@Temperature <=75.0 °F
in original, unopened containers
 
Descriptive Properties
Cure Scheduleovernight at 75°Fplus 1-2 hours at 150-200°F
Mixing Ratio1:1 by weightParts A to B
ViscosityflowablePart A
 flowablePart B

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PMASTM902 / 185495

Metal adhesives

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