Chemically Resistant Epoxy Withstands a Year in Sulphuric and Hydrochloric Acid

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%-98% sulphuric acid and 36% hydrochloric acid for over a year.

With a dielectric strength of 400volts/mil, EP21AR is a durable and stable epoxy that is also a superb electrical insulator. Its coefficient of thermal expansion is 45ppm/°C to 55ppm/°C, and it is serviceable from -60°F to +275°F. It produces high strength, abrasion resistant bonds with a tensile strength over 10,000psi, a shear strength exceeding 2,700psi, and a compressive strength greater than 14,000psi at 75°F.

EP21AR is easy to use, with a forgiving 2:1 mix ratio by weight and a mixed viscosity of 10,000cps-15,000cps. It is 100% reactive, with no solvents or diluents, and can be applied smoothly in any thickness. This epoxy has a working life of 45 to 55 minutes at ambient temperature for a 200g batch, and cures at room temperature or faster at elevated temperatures. It bonds well to a wide variety of substrates, including metals, glass, ceramics, cements, vulcanized rubbers, wood and many plastics.

EP21AR is packaged in pint, quart, gallon and five-gallon container kits. It is widely used in an array of industries, including oil and chemical processing, maintenance and repair, optics, metalworking, appliance, and electrical/electronic.

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