Master Bond Polymer System EP37-3A is a two component, low viscosity, colorless transparent casting compound which cures either at ambient or more quickly at elevated temperature to a tough, optically clear elastomer. The cured polymer features excellent electrical insulation properties and provides durable environmental pro-tection to electronic components and devices where a tough, elastic and transparent encapsulation or coating is required. It has also been successfully employed for the protection of various optical devices, solar cells and an outer refractive coating on fiber optics.