Master Bond's
EP21AR is a two-component epoxy that can
withstand harsh, acidic environments, including prolonged immersion in 96-98
percent sulfuric acid and 36 percent hydrochloric acid for over a year. With a
dielectric strength of 400V/mil, EP21AR is a durable and stable epoxy that is
also an electrical insulator. Its coefficient of thermal expansion is 45-55
ppm/C, and it is serviceable from -60 to +275F. It produces high strength,
abrasion resistant bonds with a tensile strength over 10,000 psi, a shear
strength exceeding 2,700 psi and a compressive strength greater than 14,000 psi
at 75F.
EP21AR is
easy to use with a forgiving 2 to 1 mix ratio by weight, and a mixed viscosity
of 10,000-15,000 cps. It is 100 percent reactive with no solvents or diluents
and can be applied smoothly in any thickness. This epoxy has a working life of
45 to 55 mins at ambient temperature for a 200 g batch, and cures at room
temperature or faster at elevated temperatures. It bonds well to a wide variety
of substrates, including metals, glass, ceramics, cements, vulcanized rubbers,
wood and many plastics.
EP21AR is packaged in pint, quart, gallon and 5 gallon container kits. It is used in oil and chemical processing, maintenance and repair, optics, metalworking, appliance and electrical/electronic industries.