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Metal adhesives

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Master Bond EP21ND-LO Low Outgassing, Room Temperature Curing Two Component Epoxy
Categories: Polymer; Adhesive; Thermoset; Epoxy; Epoxy Adhesive

Material Notes: Key Features:
  • Convenient one to one mix ratio
  • Cures at ambient temperatures
  • Passes NASA low outgassing specifications
  • Paste — non-drip application
  • High bond strength
  • Dimensionally stable
Product Description: Master Bond EP21ND-LO is a two component, room temperature curing epoxy system for bonding, sealing and coating featuring outstanding physical properties. EP21NDLO has a convenient one to one mix ratio by weight. It has a paste-like viscosity after mixing. EP21ND-LO can be applied without sagging or dripping even on vertical surfaces. EP21ND-LO 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 is serviceable over the wide temperature range of -60°F to +250°F. It bonds well to a variety of substrates including metals, glass, ceramics, wood, rubber and many plastics. Once cured, EP21ND-LO is an excellent electrical insulator. The standard color of the cured material is gray. Most importantly, EP21ND- LO passes NASA low outgassing specifications as per ASTM E595. To optimize its properties, the best cure schedule for this system is 12-24 hours at room temperature, plus another 2 hours at 150-200°F. This exceptionally versatile system is widely used in the electronic, electrical, computer, metalworking, appliance, chemical, aerospace and OEM industries.

Product Advantages:

  • Convenient mixing, one to one mix ratio by weight
  • Easily applied; adhesive spreads smoothly; non-drip application feature
  • High bonding strength to a wide variety of substrates
  • Excellent dimensional stability
  • Good electrical insulation properties
  • Superior durability, thermal shock and chemical Resistance
  • Passes NASA low outgassing specifications
  • 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 >= 10000 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 weightParts A to B
Viscositypastemixed

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PMASTM830 / 185423

Metal adhesives

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