Constant seating stress gaskets derive their name from the fact that the carrier ring profile takes flange rotation (deflection under bolt preload) into consideration. It is thought that a gasket will last longer if more compressive load is exerted on it. All shapes and sizes of rubber gaskets are manufactured. The material choice for gasket manufacturers is more difficult. An additional downside is that the metal used must be softer than the flange in order to ensure that the flange does not