The PTFE bellows are formed by cutting alternately into the bore and external surfaces of a PTFE cylinder, to form internal and external grooves. Typical applications include expansion and anti vibration joints, connections which allow a high level of misalignment, and one piece coupling systems which replace multi fitting configurations in difficult or confined areas of a production plant. Bellows for diameters over and above 300mm are also available. The high level of chemical resistance of the PTFE material makes the bellows use with a wide range of piping and vessel materials, including glass, lined carbon steel and stainless steel, composite and flexible materials up to service temperature as high as 230'C depending upon the nature of the fluid being handled and the service pressure.