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Metal adhesives

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Master Bond EP21TPND-NV Two component, paste-like epoxy polysulfide
Categories: Polymer; Thermoset; Epoxy

Material Notes: Key Features:
  • One to one mix ratio
  • Superior resistance to fuels and oils
  • Thixotropic paste
  • Room temperature curing compound
  • Withstands 1,000 hours 85°C/85% RH
  • Fully complies with RoHS regulations
Product Description: Master Bond EP21TPND-NV is a two component epoxy polysulfide system with a paste consistency that cures at room temperature or more rapidly at elevated temperatures. It has a forgiving one to one mix ratio by weight or volume and can be used as an adhesive, coating and sealant. It’s very resistant to a number of chemicals including water, gasoline, fuels, oils, hydrocarbons, hydraulic fluids and many acids and bases. Significantly, unlike many chemical resistant epoxy based materials, this system has excellent toughness and flexibility. The combination of properties enables EP21TPND-NV to withstand rigorous thermal cycling as well as mechanical and thermal shocks. It bonds well to a variety of substrates, including metals, glass, ceramics and many rubber and plastic materials. The cured system has excellent electrical insulation properties. Its service temperature range is -80°F to +250°F. One unusual feature of EP21TPND-NV is the influence of adding heat to the curing cycle. When cured at room temperature the Shore D hardness is 60-65 and when cured at 200°F for 2-3 hours, its hardness is 15-20 Shore D. Therefore, to optimize properties, especially its chemical resistance profile, room temperature curing only is recommended. The color of Part A is black and Part B is amber, although, other colors are available. Polysulfide based systems, including EP21TPND-NV, have been used as fuel tank sealants and as sealing compounds for electrical connectors exposed to fuels, oils and lubricants, for many years. EP21TPND-NV is also widely used in the aerospace, OEM, electronic, electrical, chemical and related industries.

Product Advantages:

  • Easy mixing, forgiving 1:1 mix ratio, weight or volume
  • Smooth paste consistency, simple to apply
  • Ambient temperature curing imparts optimal chemical resistance and hardness
  • Forms tough bonds; resistant to thermal cycling
  • Bonds well to a variety of substrates
  • Superb resistance to oils, fuels and related chemicals

Information provided by Master Bond.

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 >= 100000 cPPart A
 
Mechanical PropertiesOriginal ValueComments
Hardness, Shore D 40 - 50
 60after 1,000 hours 85°C/85% RH
Tensile Strength 4000 - 5000 psi
Elongation at Break 20 - 30 %
Tensile Modulus 150000 - 200000 psi
Adhesive Bond Strength >= 350 psiTensile lap shear, Al to Al
 
Electrical PropertiesOriginal ValueComments
Volume Resistivity 1.00e+14 ohm-cm
Dielectric Constant 3.7
@Frequency 60 Hz
 
Thermal PropertiesOriginal ValueComments
CTE, linear 55.0 - 60.0 µm/m-°C
Maximum Service Temperature, Air 250 °F
Minimum Service Temperature, Air -80.0 °F
 
Processing PropertiesOriginal ValueComments
Cure Time 48.0 - 72.0 hour
@Temperature 23.9 °C
Working Life 30.0 - 60.0 minafter mixing, 100 gram batch
Shelf Life 12.0 Monthin original unopened containers
 
Descriptive Properties
Mixing ratio1:1 by weight or volumePart A to B
ViscosityThixotropic pastePart B
 Thixotropic pasteMixed

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PMASTM5916 / 306805

Metal adhesives

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