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Metal adhesives

Master Bond EP70CN Two component, epoxy system
Categories: Polymer; Thermoset; Epoxy; Epoxy Adhesive

Material Notes: Key Features:
  • Low viscosity
  • Long working life
  • Good chemical resistance
  • Superior wetting properties
Master Bond EP70CN is a low viscosity epoxy for high performance bonding, sealing, coating and potting. The mix ratio is a forgiving 100 to 30 by weight along with a desirably long open time. It cures readily at ambient temperatures and more rapidly at elevated temperatures. An optimum curing schedule is overnight at room temperature followed by 3-4 hours at 140-170°F. EP70CN does not contain any solvents or diluents. The system has low shrinkage upon curing. It is an excellent adhesive and bonds well to a wide variety of substrates including metals, ceramics and many rubbers, plastic materials, and especially composites. It wets out very nicely and fits well for applications involving bonding and sealing fibers. Other desirable properties include exceptional physical strength and very good chemical resistance. It is a robust electrical insulator which combined with its lower exotherm enables it to be used in a wide array of potting applications. The service temperature range is -80°F to +450°F. The color of Part A is clear and Part B is light orange. This versatile system can be used in aerospace, electronic, opto-electronic and specialty type OEM applications, particularly those involving composites and fibers.

Product Advantages:

  • Low viscosity and longer open time
  • Very fine wetting properties
  • First rate temperature and chemical resistance
  • Splendid physical strength properties
  • Reasonably good optical clarity and light transmission

Information provided by Masterbond.

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
Viscosity 100 - 300 cP100 - 300 cPPart B
 2500 - 5000 cP2500 - 5000 cPmixed
 10000 - 15000 cP10000 - 15000 cPPart A
Linear Mold Shrinkage <= 0.00010 cm/cm<= 0.00010 in/in
 
Mechanical PropertiesMetricEnglishComments
Hardness, Shore D 75 - 8575 - 85
Tensile Strength 75.8 - 82.7 MPa11000 - 12000 psi
Tensile Modulus 2.07 - 2.41 GPa300 - 350 ksi
Adhesive Bond Strength 8.27 - 9.65 MPa1200 - 1400 psilap shear, Al/Al
 
Electrical PropertiesMetricEnglishComments
Volume Resistivity >= 1.00e+14 ohm-cm>= 1.00e+14 ohm-cm
Dielectric Constant 4.3
@Frequency 60 Hz
4.3
@Frequency 60 Hz
 
Thermal PropertiesMetricEnglishComments
Maximum Service Temperature, Air 232 °C450 °F
Minimum Service Temperature, Air -62.2 °C-80.0 °F
Glass Transition Temp, Tg 130 - 135 °C266 - 275 °F
 
Optical PropertiesMetricEnglishComments
Refractive Index 1.551.55
 
Processing PropertiesMetricEnglishComments
Cure Time  120 - 180 min
@Temperature 93.3 °C
2.00 - 3.00 hour
@Temperature 200 °F
 4320 - 5760 min
@Temperature 23.9 °C
72.0 - 96.0 hour
@Temperature 75.0 °F
Working Life 60.0 - 90.0 min60.0 - 90.0 minAfter mixing, 100 g batch
Shelf Life 12.0 Month12.0 MonthIn original unopened containers
 
Descriptive Properties
Cure scheduleOvernight at 75°F plus 3-4 hours at 140-170°FOptimum
Mixing Ratio100:30Parts A to B, by weight

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PMASTM720 / 233777

Metal adhesives

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