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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