Non-drip epoxy delivers acid resistance

Master Bond EP21ARHTND-2 is a two-part epoxy adhesive developed to withstand prolonged chemical exposure. "The system's chemical resistance was successfully tested in chemicals such as 98% sulphuric acid, 25% hydrochloric acid, 20% phosphoric acid, and 15% nitric acid by soaking cured samples for more than 12 months", says senior product engineer Rohit Ramnath. "The product also passes the damp heat reliability testing by withstanding 1000 hours of 85C and 85% Relative Humidity (RH)."

Although the epoxy adhesive can cure at room temperature, a coptimisedule of overnight at ambient temperatures is typically recommended to optimise its acid resistance properties, followed by a heat cure of 150-200F for 2-4 hours or longer. It is a reliable electrical insulator with a volume resistivity greater than 1014 ohm-cm at 75F and a 440V/mil dielectric strength at 75F for a 1/8-inch test specimen. Other noteworthy properties include a tensile strength of 9,000-10,000psi and a Shore D hardness of 75-85. The adhesive provides good heat resistance and is serviceable from -60F to +400F.

The epoxy does not contain solvents and is RoHS-compliant. It bonds well to metals, ceramics, composites, rubbers, and plastics. It provides a smooth paste-like consistency and will not flow or sag once applied, making it ideal for bonding and sealing applications. It is available in ½ pint, pint, quart, and gallon container kits. Speciality packaging can also be provided in 50ml (cc) double barrel cartridges, eradicating the necessity for manual measuring and mixing and allowing the possibility of manual or automated dispensing.

The company's chemically resistant systems protect against various chemicals, including acids, bases, solvents, water, alcohol, and sterilants. These compounds are used in chemical processing plants, chemical piping and tanks, medical devices, aerospace, and many other industries and applications. Its custom-formulated systems are tailored to fulfil specific requirements.