A polymer with exceptional chemical resistance, Polytetrafluoroethylene (PTFE), is the most widely used plastic for industrial sealing. The only media that can chemically attack PTFE are liquid alkaline metals and free fluorine. PTFE has excellent properties for electrical insulation, anti-stick, impact resistance and an extremely low coefficient of friction.
Extruding, laminating and sintering either pure PTFE or mixed with other materials, results in gasket products with distinct physical and chemical properties to meet the needs of each sealing application.
PTFE gaskets are used in services where it is necessary to have a high chemical resistance. As with any fluid sealing material there is some overlapping of the individual products. Several materials can be used successfully in the same application. The most popular materials for specific applications, with special characteristics and advantages, are discussed in the following paragraphs.
To reduce creep a special manufacturing process was developed and implemented for the production of high end PTFE flat gasket sheets. The material is subjected to lamination before sintering, creating a highly multidirectional fibrillated structure. Creep, at both, room and high temperature, is substantially reduced. To meet the chemical resistance needed, different mineral or synthetic fillers are used, like Barite, mineral and synthetic Silica, Barite (Barium Sulphate) or Hollow-Glass-Micro-Spheres. Each filler meets specific service applications, but there is a great similarity of all of them for standard / not critical applications. The most widely used fillers are:
To minimize the creep associated with normal, sintered PTFE, TEADIT® utilises a thermal expansion process before sintering. Gasket products expanded in one direction (cords or tapes) or multidirection (tapes or sheets) are being produced this way. Expanded PTFE has excellent chemical resistance; it also exhibits a very high compressibility and is therefore ideal for use with fragile or glass lined flanges. Its main drawback is the handling and installation of large gaskets or where it is not possible to separate the flange faces. It is often used as a replacement for the sheet filled with Hollow Glass Micro-Spheres.
Glass Microspheres Tealon TF1570
Barium Sulfate Tealon TF1580
Multidirectional - 24SH
Unidirectional - 24B
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