With a glass transition temperature exceeding 180°C, UV25 offers impressive thermal stability over the broad service temperature range of -60°F to +500°F. This one part, fast curing, moderate viscosity UV curable system bonds well to glass, surface treated metals, plastics such as polycarbonates, acrylics, among others. Additionally, this material is optically clear with a refractive index of 1.55 at room temperature.