Epoxy coating

Epoxy coating

October 1, 2020

Master Bond Inc


Hackensack New Jersey – Master Bond EP21ARLV is a two-part epoxy that may be used as an adhesive, sealant, coating, or encapsulant. The product is capable of withstanding prolonged exposure to a wide 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 have a low viscosity of 3,000cps to 6,000 cps and 4,000cps to 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 EP21ARLV is 100 to 50 by weight, and it cures at room temperature. However, the addition of heat not only speeds up the curing process, but it is also vital for optimizing acid resistance. It is a reliable electrical insulator with a volume resistivity greater than 1,014ohm-cm at 75°F, and dielectric strength of 440V/mil at 75°F, for a 1/8" test sample. Other noteworthy properties:

  • Tensile strength of 8,000psi to 9,000psi
  • Shore D hardness of 80-90
  • Tensile modulus of 350,000psi to 400,000psi.
  • Serviceable from -60°F to 250°F

This compound bonds well to a variety of substrates including metals, ceramics, composites, and many plastics and rubbers. It is available for use in 1/2 pint, pint, quart, and gallon container kits. Specialty packaging is also available in gun dispensers. The standard color of Part A is clear and Part B is amber clear, although it can be formulated in many different colors upon request. EP21ARLV does not contain solvents and is RoHS compliant.