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Metal adhesives

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Master Bond EP21TPHT Two component, epoxy polysulfide for bonding, sealing, coating and encapsulation
Categories: Polymer; Thermoset; Epoxy; Epoxy Encapsulant, Unreinforced; Polysulfide Sealant/Adhesive

Material Notes: Key Features:
  • Convenient handling
  • Tough, flexible bonds
  • Superior electrical insulation properties
  • Chemical resistance to fuels, oils, hydrocarbons and hydraulic fluids
Master Bond EP21TPHT is a two component epoxy polysulfide system featuring easy processing. It has a one to one mix ratio by weight or volume. Mixing is straightforward as both Parts A and B are liquids. EP21TPHT cures readily at ambient temperatures in 48 to 72 hours. The optimum cure is overnight at room temperature followed by 2-3 hours at 150°F. The system has low shrinkage upon curing. EP21TPHT bonds well to a variety of substrates, including metals, glass, ceramics and many rubbers and plastics. It is a toughened system with good elongation and flexibility. EP21TPHT can withstand rigorous thermal cycling as well as mechanical and thermal shock. The forte of the cured system is chemical resistance to water, gasoline, fuels, oils, hydrocarbons, hydraulic fluids, and lubricants. This material is an outstanding electrical insulator. It also has enhanced temperature resistance when compared to other epoxy polysulfide systems. The service temperature range is -80°F to +350°F. Part A is clear and Part B is slightly amber, although other colors are available upon request. Polysulfide epoxies are a special group of adhesives and sealants since they combine good toughness along with chemical resistance. EP21TPHT should be considered in aerospace, electronic, electrical, specialty OEM, and other applications where the combination of chemical resistance, along with a measure of resiliency are desirable.

Product Advantages:

  • Convenient mixing, forgiving 1:1 mix ratio by weight or volume
  • Brushable, easy to apply
  • Produces tough bonds that withstand thermal cycling
  • Good hardness and elongation
  • Exceptional resistance to fuels, oils, and similar chemicals

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 500 - 2000 cPPart B
 5000 - 15000 cPMixed
 90000 - 140000 cPPart A
 
Mechanical PropertiesOriginal ValueComments
Hardness, Shore D 55 - 65
Tensile Strength 3000 - 4000 psi
Elongation at Break 20 - 40 %
Tensile Modulus 30000 - 50000 psi
Adhesive Bond Strength 1600 - 1800 psiTensile Lap Shear; Al/Al
 
Electrical PropertiesOriginal ValueComments
Volume Resistivity >= 1.00e+14 ohm-cm
Dielectric Constant 3.9
@Frequency 60 Hz
 
Thermal PropertiesOriginal ValueComments
CTE, linear 55.0 - 60.0 µm/m-°C
Maximum Service Temperature, Air 177 °C
Minimum Service Temperature, Air -62.0 °C
 
Processing PropertiesOriginal ValueComments
Cure Time 2.00 - 3.00 hour
@Temperature 65.6 °C
Optimum cure schedule: Overnight at room temperature, followed by 2-3 hours at 150°F
Working Life 20.0 - 40.0 min
@Temperature 23.9 °C
After mixing, 100 gram batch
Shelf Life 6.00 - 12.0 Month
 
Descriptive Properties
Mixing ratio1:1 by weight

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PMASTM604 / 249000

Metal adhesives

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