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KWO® FR (fiber-reinforced)

ePTFE gasket tape with fillers

KWO® FR is a gasket tape made from glass fibre reinforced expanded PTFE. The added glass fibres improve the mechanical properties and allow a higher operating temperature.

The result is a considerably reduced cold-flow tendency, good recovery properties and excellent sealing performances at thermal cyclings. The added glass fibres enhance the mechanical characteristics and reduce creep and cold-flow. The tape withstands high loads and is suitable for applications in high-temperature environments. KWO® FR tape has a rectangular cross-section and is self-adhesive. The used glue is characterised by a high adhesive force.  
KWO® FR is suitable for applications in power plants, given its resistance to high temperatures up to 200°C and to high sealing stresses. The applications include, for example, pipe flanges, heat exchangers, compensators and lid plugs in power plants.


  • suitable for repairs of flange connections in power plants
  • resistance to high gasket stresses
  • high thickness after installation; reduced cold-flow tendency
  • suitable for systems with changing temperatures
  • 100 % expanded PTFE (ePTFE) with fillers
  • high mechanical properties & reduced slight reduction
  • UV resistant; no ageing
  • non-toxic, biologically inert
  • non-flammable


  • tube flanges
  • heat exchangers
  • apparatus engineering
  • compensators
  • flue gas plants

Technical Data

RAW MATERIAL100 % expanded PTFE (ePTFE) with fillers
TEMPERATURE RANGErecommended temperature range: from -160°C to +200°C; material heat resistant up to +315°C
CHEMICAL RESISTANCEpH range from 0 to 12; high chemical resistance, except molten alkali metals and elemental fluorine
PRESSURE RESISTANCEresistant within the usual pressure range of standard flanges up to 60 bars; suitable for vacuum applications (depends upon the concrete installation conditions)
PHYSIOLOGICALLY INERTphysiologically harmless in all recommended applications


Not for use in food, drug, cosmetic or medical device manufacturing, processing or packaging operations.