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Metal adhesives

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Master Bond EP21ND Non Drip Room Temperature Curing Epoxy System
Categories: Polymer; Thermoset; Epoxy

Material Notes: Key Features:
  • Two component system
  • One to one mix ratio
  • Room temperature curing
  • Non-drip paste
  • For bonding, sealing and coating
  • Chemical resistant
Product Description: Master Bond EP21ND is a two component, room temperature curing epoxy compound featuring outstanding physical properties, easy processing and a non-drip, paste-like consistency. This system has a non-critical one to one mix ratio by weight or volume. EP21ND has the unusual characteristic of being able to adjust the properties of the cured system by altering the mix ratio. Adding more of Part A (e.g. 2:1 mix ratio) will give a more rigid cure, while adding more of Part B (e.g. 1:2 mix ratio) gives a more forgiving cure. EP21ND produces high strength, durable bonds which hold up well to thermal cycling and resist many chemicals including water, oils, fuels, acids, bases and salts. It bonds well to a variety of substrates including metals, composites, glass, ceramics and many types of rubbers and plastics. Once cured, EP21ND is an excellent electrical insulator. It is serviceable over the wide temperature range of -60°F to +250°F. The color of Part A is gray and Part B is amber, although, a wide variety of additional color choices are also available. This exceptionally versatile system is widely used in the electronic, electrical, computer, appliance, chemical, aerospace and OEM industries.

Product Advantages:

  • Convenient mixing: non-critical one to one mix ratio by weight or volume
  • Variable mix ratio feature allows adjusting the type of cure (mentioned above)
  • Easily applied; adhesive spreads smoothly; non-drip application feature
  • Ambient temperature cures or fast elevated temperature cures as required
  • High bonding strength to a wide variety of substrates
  • Excellent dimensional stability with good electrical insulation properties
  • Lower shrinkage upon cure

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 >= 70
Tensile Strength >= 7500 psi
Elongation at Break <= 5.0 %
Tensile Modulus >= 400000 psi
Compressive Strength >= 12000 psi
Adhesive Bond Strength >= 2500 psiTensile lap, Aluminum to Aluminum
 
Electrical PropertiesOriginal ValueComments
Volume Resistivity >= 1.00e+14 ohm-cm
Dielectric Constant 2.92
@Frequency 60 Hz
 
Thermal PropertiesOriginal ValueComments
CTE, linear 50.0 - 55.0 µm/m-°C
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
 12.0 - 24.0 hour
@Temperature 23.9 °C
plus 2 hrs at 150-200°F, Optimal cure
 48.0 - 72.0 hour
@Temperature 23.9 °C
Working Life 90.0 - 120 minAfter mixing, 100 g batch
Shelf Life 12.0 Month
@Temperature <=23.9 °C
in original, unopened containers
 
Descriptive Properties
Mixing Ratio1:1 by weight or volumeParts A to B
Viscositypastemixed

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Master Bond EP21 Room Temperature Curing Two Component Epoxy
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PMASTM828 / 185421

Metal adhesives

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