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Metal adhesives

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Master Bond EP31 High Shear and Peel Strength Room Temperature Curing Epoxy
Categories: Polymer; Adhesive; Thermoset; Epoxy; Epoxy Adhesive; Epoxy Encapsulant, Unreinforced

Material Notes: Key Features:
  • Convenient handling
  • Excellent structural adhesive
  • Combines low viscosity and optical clarity
  • Provides superior electrical insulation values
Product Description: Master Bond EP31 is a two part epoxy system used primarily for bonding, but is also serviceable as a coating, sealing and encapsulation agent. The processing is relatively easy and straightforward with a forgiving mix ratio of 100 to 30 by weight. It cures readily at room temperature or more rapidly at elevated temperatures. At ambient temperatures, it cures in about 1-2 days, and at 200°F, in about 2-3 hours. To optimize properties, an overnight cure at room temperature followed by 2-3 hours at 150-200°F is desirable. Upon cross linking, EP31 has toughness and resiliency allowing it to withstand aggressive thermal cycling. Most prominent is its remarkable tensile lap shear and peel strength (summarized below). It bonds well to a wide variety of substrates, including metals, composites, glass, rubber, ceramics and many plastics. Some other desirable attributes include chemical resistance to water, oils and fuels; very good optical clarity and low shrinkage upon curing. It is a first class electrical insulator, which, when combined with its good flow properties, enables it to be used for smaller potting applications. The service temperature range is -60°F to +250°F. It is also available in a non-drip version called EP31ND. This robust product profile allows EP31 to be considered for use in aerospace, electronic, optical, opto-electronic, specialty OEM and related industries.

Product Advantages:

  • User friendly handling and processing
  • Versatile cure schedules
  • Stellar lap shear and peel strength properties
  • Top notch electrical insulation properties
  • Impressive optical clarity

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 10 - 100 cPPart B
 9000 - 15000 cPPart A
 
Mechanical PropertiesOriginal ValueComments
Hardness, Shore D 70 - 80
Tensile Strength 6000 - 7000 psi
Tensile Modulus 300000 - 350000 psi
Adhesive Bond Strength 4000 - 4200 psiTensile lap, Aluminum to Aluminum
 
Electrical PropertiesOriginal ValueComments
Volume Resistivity >= 1.00e+15 ohm-cm
Dielectric Constant 3.75
@Frequency 60 Hz
Dielectric Strength 440 V/mil
@Thickness 3.17 mm
Dissipation Factor 0.0060
@Frequency 60 Hz
 
Thermal PropertiesOriginal ValueComments
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
 24.0 - 48.0 hour
@Temperature 23.9 °C
Working Life 30.0 - 45.0 minAfter mixing, 100 g batch
Shelf Life 12.0 Month
@Temperature <=23.9 °C
in original, unopened containers
 
Descriptive Properties
Cure ScheduleOvernight at 75°Ffollowed by 2-3 hours at 150-200°F
Mixing Ratio100:30 by weightParts A to B

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PMASTM868 / 185461

Metal adhesives

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