In addition to typical silicone properties such as flexibility and high temperature resistance, Master Bond MasterSil 156 passes the rigorous UL 94V-0 tests for flame retardancy. This two part silicone system is addition cured and does not require exposure to air for complete cross-linking. It has a one to one mix ratio by weight and will not outgas while curing. Formulated for potting, encapsulation and sealing applications, the product is a competent electrical insulator with a low viscosity that can cure in sections beyond 1-2 inches thick. It is thermally conductive and is temperature rated to 105°C by UL in thicknesses up to ¼ inch and above. Its flexibility allows it to withstand aggressive thermal cycling and resist vibration and shock. Also, it is very resistant to water, humidity, oils and other environmental elements. The silicone system bonds well to a wide variety of substrates including metals, composites, glass, ceramics and many rubbers and plastics. Since it is 100% solids and contains no solvents, its shrinkage upon cure is very low. It is available in a variety of standard packaging options ranging from ½ pint to 5 gallon container kits. This silicone has a 6 month shelf life at room temperature when stored in original, unopened containers.