Master Bond has introduced EP21ARHTND-2, a two part epoxy adhesive, designed to withstand prolonged exposure to a wide range of chemicals and has been optimised to resist acids.
“The system’s chemical resistance was successfully tested in chemicals such as 98% sulfuric acid, 25% hydrochloric acid, 20% phosphoric acid and 15% nitric acid, by soaking cured samples for more than 12 months”, says Rohit Ramnath, senior product engineer, Master Bond Inc. “The product also passes the damp heat reliability testing by withstanding 1,000 hours of 85°C and 85% Relative Humidity (RH).”
Although EP21ARHTND-2 is capable of curing at room temperature, to optimise its acid resistance properties, Master Bond recommends an overnight cure schedule at ambient temperatures, followed by a heat cure of 150°F – 200°F (65.5°C – 93.3°C) for 2 – 4 hours or longer. This epoxy is a reliable electrical insulator with a volume resistivity greater than 1014 ohm-cm at 75°F (23.8°C), and dielectric strength of 440 volts/mil at 75°F. Other noteworthy properties include a tensile strength of 9,000 psi – 10,000 psi, and a Shore D hardness of 75 – 85. EP21ARHTND-2 also provides good heat resistance and is serviceable from -60°F to 400°F (-51.1°C – 204.4°C).
EP21ARHTND-2 does not contain solvents and is RoHS compliant. The product bonds well to metals, ceramics, composites, rubbers and plastics. It features a smooth paste-like consistency and will not flow, or sag once applied, making it ideal for bonding and sealing applications. The epoxy is available for use in ½ pint, pint, quart and gallon container kits. Master Bond also offers specialty packaging in 50ml double barrel cartridges, which not only eliminates the need for manual measuring as well as mixing, but also enables the possibility of manual or automated dispensing.
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