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Metal adhesives

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Master Bond EP29LPAO Two Component Epoxy
Categories: Polymer; Thermoset; Epoxy; Epoxy Encapsulant, Unreinforced

Material Notes: Key Features:
  • Low exotherm
  • Long working life
  • Cures at room temperature
  • Superior dimensional stability
Product Description: Master Bond EP29LPAO is a two component epoxy system featuring good thermal conductivity along with being electrically isolating. It has convenient handling with a forgiving 100 to 50 mix ratio by weight. It is a lower viscosity material with excellent flow properties. It generates very little heat even when mixing larger masses. Not surprisingly, it has a very long open time as indicated below. EP29LPAO cures at room temperature in 5-7 days or in 6-8 hours at 140-180°F. The best cure schedule is overnight at room temperature followed by 4-5 hours at 150°F. Also noteworthy is its very low shrinkage upon curing, both linearly and volumetrically, as well as its dimensional stability. Its physical strength profile, especially its tensile modulus and compressive strength, is impressive. This epoxy bonds well to a wide variety of substrates including metals, glass, ceramics and many different plastics. EP29LPAO is a very good heat conductor while retaining reliable electrical insulation values. It is resistant to water, fuels and oils. Part A is off white and Part B is white. The service temperature range is -60°F to +250°F. To summarize, EP29LPAO is best utilized in large encapsulation applications where robust electrical insulation properties and low shrinkage upon curing are critical application requirements. This kind of situation can occur in the aerospace, electronic, electrical and specialty OEM industries.

Product Advantages:

  • Lower viscosity
  • Excellent flow properties
  • Long working life at ambient temperatures
  • Bonds well to many substrates
  • Good thermal conduction while retaining electrical insulation

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 5000 - 15000 cPPart B
 20000 - 40000 cPPart A
 
Mechanical PropertiesOriginal ValueComments
Hardness, Shore D 80 - 90
Tensile Strength 3000 - 4000 psi
Tensile Modulus 450000 - 500000 psi
Compressive Strength 24000 - 26000 psi
Adhesive Bond Strength 700 - 900 psiTensile lap, Aluminum to Aluminum
 
Electrical PropertiesOriginal ValueComments
Volume Resistivity >= 1.00e+15 ohm-cm
Dielectric Constant 4.4
@Frequency 60 Hz
 
Thermal PropertiesOriginal ValueComments
CTE, linear 22.0 - 24.0 µm/m-°C
Thermal Conductivity 1.30 - 1.44 W/m-K
Maximum Service Temperature, Air 250 °F
Minimum Service Temperature, Air -60.0 °F
 
Processing PropertiesOriginal ValueComments
Cure Time 6.00 - 8.00 hour
@Temperature 60.0 - 82.2 °C
 120 - 168 hour
@Temperature 23.9 °C
Working Life 420 - 540 minAfter mixing, 100 gram batch
Shelf Life 6.00 Month
@Temperature <=23.9 °C
in original, unopened containers
 
Descriptive Properties
Cure ScheduleOvernight at 75°Ffollowed by 4-5 hours at 150°F, Optimum cure
Mixing Ratio100:50 by weightParts A to B

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PMASTM847 / 185440

Metal adhesives

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