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Metal to metal seal is a kind of demanding ultrahigh vacuum which can sustains high temperatures and high pressures. It is a viscous material that changes state to become solid, once applied, and is used to prevent the penetration of air, gas, noise, dust, fire, smoke or liquid from one location through a barrier into another. Typically, seals are used to close small openings that are difficult to shut with other materials, such as concrete, drywall, etc. Desirable properties of seals include insolubility, corrosion resistance, and adhesion. Metal to metal seals are qualified to meet a wide range of applications. Uses of this kind of seals vary widely and sealants are used in many industries, for example, construction, automotive and aerospace industries. It has a low level of gas leakage acceptance rate, and bubble-tight sealing requirements With the Metal to metal seals radically compressed in operation, end caps make intimate metal-to-metal contact with housing surfaces, eliminating the potential for extrusion of the elastomeric sealing element in high-pressure service. It is Suitable for service with hydrocarbons, sour gas, explosive decompression and injection fluids, the seals could operate at down to -29C and at up to 1035bar.