MasterSil 157 is a two part system for potting, encapsulation and sealing applications. This optically clear formulation features a low index of refraction and has the ability to transmit light very well from 220-2,500 nanometers. These properties are retained over the exceptionally broad service temperature range of -175°F to +500°F [-115°C to +260°C]. Highly flexible, it is capable of withstanding the most rigorous thermal cycling and mechanical shock. These properties enable MasterSil 157 to be used in applications involving sensitive optical and electrical components.