Epoxy Withstands Harsh, Acidic Environments

The EP21AR epoxy developed by Master Bond is suitable for applications demanding excellent chemical resistance, especially to acids, fuels and oils. Whether coating, lining, bonding or sealing, this two-component epoxy can withstand harsh, acidic environments, including prolonged immersion in 96-98 per cent sulphuric acid and 36 per cent hydrochloric acid, for more than a year. With a dielectric strength of 400V/mil, the EP21AR is claimed to be a durable and stable epoxy that is also an excellent electrical insulator.

Its coefficient of thermal expansion is 45-55ppm/C and it is serviceable from -60F to +275F. It produces high-strength, abrasion-resistant bonds with a tensile strength of more than 10,000psi, a shear strength exceeding 2,700psi and a compressive strength greater than 14,000psi at 75F. The EP21AR is said to be simple to use with a 2:1 mix ratio by weight and a mixed viscosity of 10,000-15,000cps. It is 100 per cent reactive with no solvents or diluents and can be applied smoothly in any thickness.

This epoxy has a working life of 45-55 minutes at ambient temperature for a 200g batch and cures at room temperature or faster at elevated temperatures. It bonds well to a variety of substrates, including metals, glass, ceramics, cements, vulcanised rubbers, wood and many plastics. The EP21AR is packaged in pint-, quart-, gallon- and five-gallon-container kits. It is used in industries including oil and chemical processing, maintenance and repair, optics, metalworking, appliance and electrical/electronic.

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