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Master Bond EP21ARHTND-2 Two Component Epoxy Adhesive
Categories: Polymer; Thermoset; Epoxy; Epoxy Adhesive

Material Notes: Key Features:
  • Paste consistency
  • Convenient handling
  • Superior temperature resistance
  • Good physical strength properties
Product Description: Master Bond EP21ARHTND-2 is a two component epoxy resin system for high performance bonding, sealing and coating. It has a convenient 100 to 50 mix ratio by weight and is formulated to cure at ambient temperatures, or more quickly at elevated temperatures. Various cure schedules are noted in the chart below, with the optimum cure being overnight at ambient temperature followed by 2-4 hours at 150-200°F. The primary use of this system is for acid resistance, particularly sulfuric and hydrochloric acids. EP21ARHTND-2 has very low linear shrinkage upon cure, is 100% reactive, and contains no solvents or diluents. This system bonds well to a wide variety of substrates including metals, glass, ceramics, rubbers and plastics. It has excellent physical strength properties, notably high tensile strength. It withstands thermal cycling and has a low coefficient of thermal expansion. It is also a robust electrical insulator. EP21ARHTND-2 has a smooth paste consistency that is especially accommodating for a number of applications including the coating of substrates that might be used in tanks and storage containers. Its viscosity makes using it simple and straight forward, as the epoxy will not flow when applied. The service temperature range is -60°F to +400°F. The color of Parts A and B are amber. EP21ARHTND-2 is widely used in aerospace, electronic, electrical, chemical processing, and in other applications where chemical resistance to acids is needed and a non-drip viscosity is helpful.

Product Advantages:

  • Convenient handling, 2:1 mix ratio by weight
  • Smooth paste consistency
  • Good physical strength properties
  • Outstanding chemical resistance, particularly to acids

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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Mechanical PropertiesOriginal ValueComments
Hardness, Shore D 75.0 - 85.0
Tensile Strength 9000 - 10000 psi
Adhesive Bond Strength 2200 - 2400 psilap shear, aluminum to aluminum
 
Electrical PropertiesOriginal ValueComments
Volume Resistivity >= 1.00e+14 ohm-cm
Dielectric Constant 3.80
@Frequency 60 Hz
Dielectric Strength 440 V/mil
@Thickness 3.17 mm
 
Thermal PropertiesOriginal ValueComments
CTE, linear 40.0 - 45.0 µm/m-°C
Maximum Service Temperature, Air 204 °C
Minimum Service Temperature, Air -51.0 °C
 
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 - 50.0 minafter mixing, 100 gram batch
Shelf Life 12.0 Monthin original, unopened containers
 
Descriptive Properties
Mixing ratio100:50Part A to B
Optimum cure scheduleOvernight at 75°F followed by 2-4 hours at 150-200°F
ViscositypastePart A
 pastePart B

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PMASTM5801 / 323318

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