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The concept of spiral wound gasket construction was originated by Flexitallic in 1912, inaugurating the beginning of a new era in safe, effective sealing. The primary purpose for the development of spiral wounds gaskets was the increasingly severe temperatures and pressures used by U.S. refinery operators in the first half of the century. The necessity for a gasket to have the ability to recover cannot be over emphasized. The effects of pressure and temperature fluctuations, the temperature differential across the flange face, together with bolt stress relaxation and creep, demand a gasket with adequate flexibility and recovery to maintain a seal even under these varying service conditions. The Flexitallic Spiral Wound Gasket is the precision engineered solution to such problems, meeting the most exacting conditions of both temperature and pressure in flanged joints and similar assemblies and against virtually every known corrosive and toxic media. CGI Spiral Wound Gaskets are fitted with internal ring which gives an additional compression limiting stop and provides heat and corrosion barrier protecting gasket windings and preventing flange erosion. CGI Spiral Wound Gaskets are suitable for use with flat face and raised face flanges. The outer ring on the CGI Spiral wound gasket acts much like the outer ring on the CG Style Spiral Wound Gasket. The inner ring on the CGI Spiral Wound Gasket also offers additional benefits such as preventing the gasket from buckling or imploding, and can also reduce the risk of flow turbulence that can be caused by CG or R Spiral wound gaskets.