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Are used mainly in chemical process pipelines and chemical equipments.
Basic types:
Pointed folds : large expansion for low pressures up to 1 bar,max 150ºC.

Round folds : Medium expansion for medium pressures up tp aprox 5 bar,max 150ºC.

Square folds : Low expansion for higher pressures,max 150ºC.

Special versions, including metal reinforcing rings,are available for high pressures and temperatures.The bellows can be supplied with and without steel or GRP- flanges.

Special versions of PTFE bellows are used in glandless valve and pump installations where they act as shut-off,volume control and sealing elements mostly with fibreglass-reinforced bottom plates or cones and with moulded-in threaded steel bushes.