Metal gaskets are made of different materials such as steel, nickel, stainless steels, titanium, Inconel. They are used when higher chemical stress and extreme operating conditions are present. Metal seals require high bolt forces and stable flanges. In practice, slightly curved contact surfaces are often used to reduce the forces or to achieve a high surface pressure.
Metal seals ensure a high level of operational reliability while at the same time realizing the smallest leaks.