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Metal adhesives

Master Bond EP21TPND Two Component Polysulfide Epoxy Adhesive  (discontinued **)
Categories: Polymer; Adhesive; Thermoset; Epoxy; Epoxy Adhesive; Polysulfide Sealant/Adhesive

Material Notes: EP21TPND-NV complies with RoHS3 Directive (EU) 2015/863. It is a new version of EP21TPND, which has been discontinued.

Key Features:

  • One to one mix ratio
  • Superior resistance to fuels and oils
  • Thixotropic paste
  • Room temperature curing compound
  • Flexible system
  • Resists thermal cycling
Product Description: Master Bond EP21TPND 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 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 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, have been used as fuel tank sealants and as sealing compounds for electrical connectors exposed to fuels, oils and lubricants, for many years. EP21TPND is also widely used in the aerospace, OEM, electronic, electrical, chemical and related industries.

Product Advantages:

  • Convenient mixing: forgiving one to one mix ratio by weight or volume
  • Easy to apply — adhesive spreads evenly and smoothly; non-drip viscosity
  • 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 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 PropertiesMetricEnglishComments
Viscosity >= 1000 cP>= 1000 cPPart A
 
Mechanical PropertiesMetricEnglishComments
Hardness, Shore D 60 - 6560 - 65
Tensile Strength 41.4 - 48.3 MPa6000 - 7000 psi
Elongation at Break 20 - 30 %20 - 30 %
Adhesive Bond Strength 12.4 - 13.8 MPa1800 - 2000 psiTensile lap, Aluminum to Aluminum
 
Electrical PropertiesMetricEnglishComments
Volume Resistivity 1.00e+14 ohm-cm1.00e+14 ohm-cm
Dielectric Constant 3.7
@Frequency 60 Hz
3.7
@Frequency 60 Hz
 
Thermal PropertiesMetricEnglishComments
CTE, linear 55.0 - 60.0 µm/m-°C30.6 - 33.3 µin/in-°F
Maximum Service Temperature, Air 121 °C250 °F
Minimum Service Temperature, Air -62.2 °C-80.0 °F
 
Processing PropertiesMetricEnglishComments
Cure Time 2880 - 4320 min48.0 - 72.0 hour
Working Life 30.0 - 60.0 min30.0 - 60.0 minAfter mixing, 100 g batch
Shelf Life 12.0 Month
@Temperature <=23.9 °C
12.0 Month
@Temperature <=75.0 °F
in original, unopened containers
 
Descriptive Properties
Mixing Ratio1:1 by weight or volumeParts A to B
ViscosityThixotropic pastePart B
 Thixotropic pastemixed

**
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PMASTM843 / 185436

Metal adhesives

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