Master Bond EP21AR Epoxy

Master Bond develops a chemically resistant epoxy able to withstand a year in sulfuric and hydrochloric acid

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For applications demanding exceptional chemical resistance, especially to acids, fuels, and oils, Master Bond has developed EP21AR. Whether coating, lining, bonding or sealing, this two-component epoxy can withstand harsh, acidic environments, including prolonged immersion in 96 to 98% sulfuric acid and 36% hydrochloric acid for over a year.

  • Dielectric strength of 400 volts/mil provides durability and stability as well as electrical insulation
  • Coefficient of thermal expansion is 45-55 ppm/C
  • Serviceable from -60 F to +275 F
  • Produces high strength, abrasion resistant bonds with a tensile strength over 10,000 psi, a shear strength exceeding 2,700 psi, and a compressive strength greater than 14,000 psi at 75 F
  • Employs a 2 to 1 mix ratio by weight, and a mixed viscosity of 10,000-15,000 cps
  • 100% reactive with no solvents or diluents
  • Applies smoothly in any thickness
  • Has a working life of 45 to 55 minutes at ambient temperature for a 200 gram batch, and cures at room temperature or faster at elevated temperatures
  • Bonds to various substrates including metals, glass, ceramics, cements, vulcanized rubbers, wood and many plastics
  • Available in pint, quart, gallon and 5 gallon container kits
  • Applicable in industries including oil and chemical processing, maintenance and repair, optics, metalworking, appliance, and electrical/electronic


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