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Recent trends in engine development introduced for improved efficiency, performance and environmental friendliness are having a significant effect on cylinder head gasket performance. The customers' expectations of gaskets continue to increase in the recognition that gaskets are essential parts of a
able for use in harsh chemical and/or physical environments. Traditionally, these seals have an energiser ring made from stainless steel. However, there are disadvantages to such an arrangement. Making the band in the required shape and configuration, within the desired tolerances, can be difficult.
The convolutions may be substantially 'U' shaped and formed as a bend of the sealing ring. Alternatively, it may be defined by the junction between two rigidly connected but oppositely directed parts, such as the welded joint between one edge of a sealing ring and one edge of a restraining ring.