Sealing materials fluorinated elastomers

In general, elastomer materials are used to seal PEFC, the most prominent being silicones, EPDM rubbers (Ethylene Propylene Diene Monomer class mbber) and fluorinated elastomers [74, 77, 78]. 

Fluorine-containing rubbers were originally developed during the search for fluid-resisting elastomers which could be used over a wide temperature range. Much of the initial developmental work was a result of contracts placed by the US Army and Air Force. Whilst the eurrent commercial materials are very expensive compared with general purpose rubbers they find a number of both military and non-military applications, particularly in the area of seals and 0-rings. 

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