Metal seals are used under conditions that polymer-based O-rings and gaskets cannot withstand, metal seals can withstand temperatures up to nearly 1,800°C. Metal seals are also used under severe conditions such as cryogenic environments of -270°C or lower, ultra-high-pressure environments exceeding 600 MPa, and ultra-high-vacuum environments of 1 x 10^10 Pa or lower. They are used in aircraft engines, gas turbines, O&G equipment, Nuclear power, airspace device, rocket engines, supercritical facilities, storage facilities and so on.
