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Master Bond EP21NS is a two part epoxy that may be used for bonding, coating, sealing and potting/encapsulating. It has a nanosilica filler that imparts dimensional stability and abrasion resistance. When measured according to ASTM D4060, standard test method for abrasion resistance, with CS-17 wheel for 1,000 cycles, EP21NS exhibits a very low weight loss of 25 mg. This formulation is a reliable electrical insulation with a volume resistivity greater than 1015 ohm-cm, an outstanding dielectric constant of 2.6 at 16.4 GHz and a dielectric strength of 450 volts/mil at 75°F, for a 1/8th inch thick specimen. It is serviceable over the temperature range of -80°F to +250°F.
This system has a long working life and good flow properties with a moderate mixed viscosity of 50,000-90,000 cps. The mix ratio of EP21NS is 1 to 1 by weight, and its optimal cure schedule is overnight at room temperature followed by 4 to 5 hours at 150°F. It features very low shrinkage upon curing, a low coefficient of thermal expansion of 30-35 x 10-6 x in/in/°C and a compressive strength of 16,000-18,000 psi.
This compound bonds well to a variety of substrates including metals, composites, glass, ceramics, rubbers and many plastics. EP21NS is resistant to water and salts. It is packaged in ounce kits, ½ pint kits, pint kits, and quart kits. The color of Part A is translucent and Part B is amber. EP21NS does not contain solvents and is RoHS compliant.
Master Bond EP21NS is an abrasion resistant epoxy that features a moderate viscosity, high compressive strength and electrical insulation. This versatile two component system can be used for high performance bonding, sealing, coating and encapsulating. Read more about Master Bond’s abrasion resistant adhesives and coatings at https://www.masterbond.com/properties/abrasion-resistant-adhesives-and-coatings or contact Tech Support. Phone: +1-201-343-8983 Fax: +1-201-343-2132 Email: firstname.lastname@example.org.
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James Brenner, Marketing Manager
MASTER BOND INC.
154 Hobart Street
Hackensack, NJ 07601-3922
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