Master Bond EP21AC is a two-part epoxy with a non-halogenated filler that is formulated for applications where arc resistance and flame retardancy are required. Electrical arcing is a challenge for numerous electronic or electrical devices. This occurs when electricity jumps from one connection to another, resulting in an electrical breakdown. The air surrounding the current becomes ionized and arcs, which may lead to combustion and fire. EP21AC is designed primarily with the aim to prevent arcing related issues. It also passed the UL746A High Amp Arc Ignition test with the highest rating, which is a Performance Level Category 0.
EP21AC has a convenient-to-use 1-to-1 mix ratio by weight and cures at room temperature, or more rapidly with heat. It has good flow properties with a mixed viscosity of 30,000 to 50,000 cps and a relatively long working life of 75 to 120 minutes at room temperature. This compound bonds well to several substrates including metals, ceramics, composites, and many plastics and rubbers. It is available for use in ounce kits or ½-pint, pint, quart and gallon container kits. Specialty packaging is also available in premixed and frozen syringes.