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Metal adhesives

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Master Bond Supreme 70CN Two component, toughened epoxy system for bonding, sealing, coating and potting derived from natural substances
Categories: Polymer; Thermoset; Epoxy

Material Notes: Master Bond Supreme 70CN is a moderate viscosity, toughened epoxy for high performance bonding, sealing, coating and potting. The mix ratio is a forgiving 100 to 30 by weight with a user friendly working time of 60-90 minutes. It cures readily at ambient temperatures and more rapidly at elevated temperatures. An optimum curing schedule is overnight at room temperature followed by 4-5 hours at 140-170°F. Supreme 70CN does not contain any solvents or diluents and has low shrinkage upon curing. It should be noted that this epoxy has exceptional wetting properties. Supreme 70CN is an excellent adhesive and bonds well to a wide variety of substrates including metals, ceramics and many rubbers, plastic materials, and especially composites. An important feature is its toughness, which allows it to be used for bonding dissimilar substrates and to withstand thermal cycling. Other favorable attributes include good physical strength and excellent chemical resistance. It is a reliable electrical insulator, which combined with its lower exotherm, enables it to be utilized in a wide array of potting applications. The service temperature range is -100°F to +400°F. The color of Part A is black and Part B is light orange. This multi-faceted system can be considered for applications in aerospace, electronic, opto-electronic and specialty type OEM, particularly those involving composites and fibers.

Product Advantages:

  • Moderate viscosity and longer open time
  • Fine physical strength properties
  • Toughened system; resists thermal cycling
  • Outstanding chemical resistance
  • NASA low outgassing
Key Features:
  • Moderate viscosity
  • Superior chemical resistance
  • Black colored, optically opaque
  • NASA low outgassing

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 1000 - 3000 cPPart B
 8000 - 12000 cPMixed viscosity
 70000 - 120000 cPPart A
Linear Mold Shrinkage <= 0.00010 in/in
 
Mechanical PropertiesOriginal ValueComments
Hardness, Shore D 75 - 85
Tensile Strength 10000 - 11000 psi
Tensile Modulus 300000 - 350000 psi
Adhesive Bond Strength 1000 - 1200 psiTensile lap shear, Al to Al
 
Electrical PropertiesOriginal ValueComments
Volume Resistivity >= 1.00e+14 ohm-cm
Dielectric Constant 4.5
@Frequency 60 Hz
 
Thermal PropertiesOriginal ValueComments
CTE, linear 35.0 - 40.0 µm/m-°C
Maximum Service Temperature, Air 204 °C
Minimum Service Temperature, Air -73.0 °C
Glass Transition Temp, Tg 125 - 130 °Cwith post cure
 
Processing PropertiesOriginal ValueComments
Cure Time 3.00 - 4.00 hour
@Temperature 71.1 - 93.3 °C
Option 2
 4.00 - 5.00 hour
@Temperature 60.0 - 76.7 °C
Optimal: overnight at 75°F plus 4-5 hours at 140-170°F
 96.0 - 120 hour
@Temperature 23.9 °C
Option 1
Working Life 60.0 - 90.0 min
Shelf Life 1.00 Monthin cans
 6.00 Monthin syringes
 
Descriptive Properties
Mixing ratio100:30

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PMASTM644 / 268832

Metal adhesives

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