Low viscosity epoxy coating features acid resistance

17-09-2020 | Masterbond | Subs & Systems

Master Bond EP21ARLV is a two-part epoxy that can be employed as an adhesive, sealant, coating or encapsulant. The product can withstand prolonged exposure to a broad range of chemicals, such as 70% sulfuric acid, 10% hydrochloric acid, 10% nitric acid and butyl acetate to name a few. Both parts A and B provide a low viscosity of 3,000-6,000cps and 4,000-6,000cps, respectively.


“With its low viscosity and acid resistance, EP21ARLV is a go-to material for potting and encapsulations in battery applications,” says Rohit Ramnath, senior product engineer. “This combination is especially useful in applications where protection from acids is crucial.”


The mix ratio of the epoxy is 100 to 50 by weight, and it cures at room temperature. Nonetheless, the addition of heat not only quickens the curing process, but it is also crucial for optimising acid resistance. It is a reliable electrical insulator with a volume resistivity greater than 1014Ohm-cm at 75F, and dielectric strength of 440V/mil at 75F, for a 1/8" test sample. Other noteworthy properties incorporate a tensile strength of 8,000-9,000psi, a Shore D hardness of 80-90 and a tensile modulus of 350,000-400,000psi. It is serviceable over a temperature range of -60F to +250F.


This compound bonds well to a mixture of substrates incorporating metals, composites, ceramics and many plastics and rubbers. It is offered for use in half-pint, pint, quart and gallon container kits. Speciality packaging is also offered in gun dispensers. The standard colour of Part A is clear, and Part B is amber clear, although it can be prepared in many different colours upon request. The epoxy does not contain solvents and is RoHS compliant.

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