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Metal adhesives

Master Bond EP29LPHE Two part, very low viscosity epoxy for bonding, sealing, coating and potting
Categories: Polymer; Thermoset; Epoxy; Epoxy Adhesive

Material Notes: Key Features:
  • Long working life
  • Very low exotherm
  • Good toughness
  • Low modulus, high elongation
  • Superior impact resistance
  • Can be used for large potting and encapsulation applications
Master Bond EP29LPHE is a two part epoxy that cures somewhat hard, but has very notable toughness along with high elongation. It can be used for bonding, coating, sealing and encapsulation. This low viscosity system has a forgiving mix ratio of 100 to 80 by weight. The working life of a 100 gram mass is exceptionally long, 12-24 hours. EP29LPHE will cure at ambient or elevated temperatures. The optimum cure schedule is 12-24 hours at room temperature, followed by 4-5 hours at 140-180°F. Upon curing, this epoxy system combines good strength and toughness. The system bonds well to a wide variety of substrates including metals, ceramics, glass, optical fibers, polyimide, graphite and many rubbers and plastics. EP29LPHE has an unusual array of physical properties. Although it cures relatively hard, it has high elongation that imparts good impact and shock resistance. It also allows it to be used in applications where thermal cycling and resistance to vibration and shock are important requirements. It is a dependable electrical insulator, which, when combined with its low viscosity and low exotherm, permits it to be particularly well suited for large casting applications. EP29LPHE has reasonably good chemical resistance to water, acids, bases, oils and fuels. Part A is amber and Part B is amber-opaque in color. Its versatility allows it to be used in a number of diverse applications including aerospace, electronic, specialty OEM and related industries where this special set of product properties is desirable.

Product Advantages:

  • Convenient, non-critical 100 to 80 mix ratio by weight
  • Very low viscosity, exceptionally long working life
  • Special physical strength profile, combining toughness, hardness and elongation
  • Notable electrical insulation characteristics; ideal for larger potting and encapsulation applications
  • Desirable adhesive for composites, optical fiber, fiberreinforced materials
  • Exceptionally low shrinkage upon curing

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 70 - 120 cP70 - 120 cPPart B
 350 - 700 cP350 - 700 cPmixed
 1500 - 2000 cP1500 - 2000 cPPart A
 
Mechanical PropertiesMetricEnglishComments
Hardness, Shore D 50 - 6050 - 60
Tensile Strength 13.8 - 20.7 MPa2000 - 3000 psi
Tensile Modulus 0.0689 - 0.138 GPa10.0 - 20.0 ksi
Adhesive Bond Strength 9.65 - 11.0 MPa1400 - 1600 psilap shear, Al/Al
 
Electrical PropertiesMetricEnglishComments
Volume Resistivity >= 1.00e+15 ohm-cm>= 1.00e+15 ohm-cm
Dielectric Constant 4.14.1
Dielectric Strength 17.7 kV/mm
@Thickness 3.17 mm
450 kV/in
@Thickness 0.125 in
 
Thermal PropertiesMetricEnglishComments
CTE, linear 50.0 - 55.0 µm/m-°C27.8 - 30.6 µin/in-°F
Maximum Service Temperature, Air 121 °C250 °F
Minimum Service Temperature, Air -51.1 °C-60.0 °F
 
Processing PropertiesMetricEnglishComments
Cure Time  8640 - 14400 min
@Temperature 60.0 - 82.2 °C
144 - 240 hour
@Temperature 140 - 180 °F
 10100 - 14400 min
@Temperature 23.9 °C
168 - 240 hour
@Temperature 75.0 °F
Working Life 720 - 1440 min720 - 1440 minAfter mixing, 100 g batch
 
Descriptive Properties
Cure schedule12-24 hours at 75°F, plus 4-5 hours at 140-180°FOptimum
Mixing Ratio100:80Parts A to B, by weight

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Metal adhesives

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