Master Bond Polymer System EP21FRNS is a two component flame resistant compound for general purpose bonding, sealing and casting, formulated to cure at room temperature. With a one-to-one mix ratio, by weight only, it readily develops a high bonding strength of more than 2000 psi at room temperature which unlike that of many other epoxy adhesives, is relatively insensitive to substrate cleaning procedures. The cured resin system features durability, toughness an high strength properties and is remarkably resistant to thermal cycling and chemicals including fuels, lubricants, water, acids and alkalis and salts as well as many aggressive organic solvents, over the exceptionally wide temperature range of -60°F up to 300°F. Adhesion to metals, glass, ceramics, wood, vulcanized rubbers and many plastics is excellent. The hardened compound is an electrical insulator. Color of Part A is black, color of Part B is tan. Master Bond EP21FRNS compound is an electronic, electrical, computer, construction, metalworking, appliance, automotive and chemical industries. It complies with UL94V-O and other critical flame retardant specifications.