Featuring a non-halogen filler, Master Bond EP21FRNS-2 passes UL 94V-0 testing for flame retardancy in potting, encapsulation and casting applications. It produces very low smoke levels and is well suited for the computer, aerospace and related industries. This two part epoxy features a convenient one to one mix ratio by weight and cures at room temperature or more quickly at elevated temperatures. The product's handling is further facilitated by color coding-Part A is black and Part B is off-white. This tough and durable system bonds well to a wide variety of substrates including metals, glass, ceramics and many plastics. It can also withstand exposure to a range of chemicals, such as water, fuels, lubricants and acids, among others. As per the UL 94V-0 specification, the epoxy is serviceable over the temperature range of -51°C to 90°C. Featuring a moderate viscosity, this epoxy maintains its flow and is a reliable electrical insulator.