Encapsulated silicone with FEP or PFA, in round, rectangular, square, oval cross section and for Camlok-type fittings, solid or hollow, with no limit as to inside diameter of the o-ring. <j,Why use encapsulated gaskets? In some applications the use of conventional rubbers is forbidden. Corrosion or high temperatures may have devastating effects on o-rings, causing premature ageing and leaks, therefore it is recommended to use encapsulated gaskets in these circumstances. O-ring material comparison: Pure PTFE o-ring: PTFE is inert and gives an excellent chemical resistance, but as a rigid plastic with practically no memory it cannot be used as a compression gasket since, once removed, it will not ensure proper sealing. PTFE sandwich: even though these gaskets are cheaper due to their design, the possibility of side permeation makes them a weak gasket which can be quickly attacked by chemical products. PTFE-coated o-rings: With acrylic or latex emulsions with PTFE you can obtain a lower friction coefficient but they do not provide a chemical resistant barrier and the coating gets damaged very easily. MEREFSA ■ [email protected] ■ Cobalto, 101, 08907 Hospitalet de Llobregat, Barcelona (Spain) ■ Tel. 00 34 933 372 081 ■ Fax 00 34 933 374 373

Perfluorelastomer o-rings: The most advanced material, it provides a fantastic chemical resistance in a very wide range of temperatures but its high cost makes these impossible to use in many occasions. Metal o-rings: they have a good chemical resistance and an excellent working capacity under high pressures, but they are very rigid and often expensive. Encapsulated o-rings: Always used as a static seal, FEP and PFA give an excellent chemical resistance and the silicone body a flexibility that plastic does not have. A silicone (-60 a +260 °C) core will be preferably used in conditions where FDA...