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Master Bond EP21TPFL-1AO Two Part, Flexible, Lower Viscosity Epoxy Polysulfide System
Categories: Polymer; Thermoset; Epoxy; Epoxy Encapsulant, Unreinforced; Polysulfide Sealant/Adhesive

Material Notes: Product Description: Master Bond EP21TPFL-1AO is a two component, low viscosity epoxy polysulfide for high performance bonding, sealing, coating and casting offering thermal conductivity, electrical insulation and excellent flexibility. This system has superior resistance to a wide array of chemicals including fuels, oils, water, gasoline, hydrocarbons and hydraulic fluids. It has been formulated to cure readily at ambient and more quickly at elevated temperatures. This system has a non-critical mix ratio of two to three, by weight or volume. This compound is 100% reactive and does not emit any solvents or volatiles during curing. This material is very special because of its thermal conductivity and electrical insulation properties along with its flexibility and chemical resistance. Its excellent flexibility permits this compound to be utilized in situations involving rigorous thermal cycling as well as thermal and mechanical shocks. Its lower viscosity and flow properties make it well suited for many potting and encapsulation applications. It has very good adhesion to metals, ceramics, glass, and many rubbers and plastics. The service temperature range is -60°F to +250°F. The color of Part A is black while Part B is off-white. EP21TPFL-1AO can be used in a wide range of different applications in the electronic, aerospace and OEM industries.

Product Advantages:

  • Convenient mixing: non-critical two to three mix ratio by weight or volume.
  • Lower viscosity enhances ease of application, compound flows evenly and smoothly; ideal for potting.
  • Versatile cure schedules—ambient temperature or fast elevated temperature cures as desired.
  • 100% reactive—no volatiles emitted during curing.
  • Outstanding flexibility with superior resistance to thermal cycling.
  • Excellent chemical resistance to extended exposure to fuels, oils, water and other chemicals.
  • Thermally conductive and electrically isolative.

Information provided by MasterBond®

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 14000 - 28000 cPPart B
 15000 - 30000 cPPart A
 
Mechanical PropertiesOriginal ValueComments
Hardness, Shore A 70 - 90
Tensile Strength at Break 500 psi
Elongation at Break >= 100 %
 
Electrical PropertiesOriginal ValueComments
Volume Resistivity >= 1.00e+14 ohm-cm
Dielectric Constant 4.4
@Frequency 60 Hz,
Temperature 25.0 °C
 
Thermal PropertiesOriginal ValueComments
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
 48.0 - 72.0 hour
@Temperature 23.9 °C
Pot Life 90 - 120 min100 gram mass
Shelf Life 12.0 Month
@Temperature 23.9 °C
in original unopened containers
 
Descriptive Properties
Mixing Ratio (A to B)2:3by weight or volume

Some of the values displayed above may have been converted from their original units and/or rounded in order to display the information in a consistent format. Users requiring more precise data for scientific or engineering calculations can click on the property value to see the original value as well as raw conversions to equivalent units. We advise that you only use the original value or one of its raw conversions in your calculations to minimize rounding error. We also ask that you refer to MatWeb's terms of use regarding this information. Click here to go back to viewing the property data in MatWeb's normal format.

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PMASTB326 / 149573

Specialty Compounds RTP Company

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