Metal C-ring is based on a metallic “C” substrate, designed to be applied in extreme working conditions. By default, Metal C-Rings for internal Pressure or external Pressure are system pressure energized, they require low bolting load and have good spring back. Due to its special structure and material, Metal C-rings can be used in working conditions such as high temperature, cryogenic, high pressure, high vacuum and other extreme working conditions of static sealing.