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KWO® CellFlon® valve packing

ePTFE gasket cord

KWO® CellFlon® valve packing is a round gasket cord consisting made from expanded PTFE with a modified structure. The patented CellFlon® processing method strengthens the fibre structure of the string seal and improves remarkably its mechanical properties. Thanks to the special processing method the cord seal features a higher compactness, a lower cold-flow tendency and better recovery properties.
KWO® CellFlon® valve packing is a universal valve string designed to seal spindles in highly aggressive or very clean environments, in particular for demanding applications in the food and pharmaceutical industry. The gasket cord seals particularly well slowly rotating and oscillating shafts. The gasket is also suitable for many static applications, in which the use of an adhesive is undesirable.


  • high residual thickness at time of installation
  • higest recovery properties
  • very good adaptability to shafts and flange surfaces
  • very low sliding friction
  • very clean material, harmless in contact with food
  • 100 % expanded PTFE (ePTFE) without fillers
  • universal velve packing
  • high mechanical properties
  • high chemical resistance
  • reduced cold flow and improved recovery
  • non-toxic, biologically inert
  • non-flammable


  • sealing for valve spindle
  • shaft seals
  • tube flanges
  • sealing for tanks
  • apparatus engineering
  • machine housing
  • food processing systems
  • pharmaceutical systems
  • compliant to FDA
  • EC1935/2004 - suitbale for applications with food contact

Technical Data

RAW MATERIAL100 % expanded PTFE (ePTFE) without fillers - modified by CellFlon®-procedure
TEMPERATURE RANGErecommended temperature range: from -200°C to +160°C; material heat resistant up to +315°C
CHEMICAL RESISTANCEpH range from 0 to 14; full chemical resistance, except molten alkali metals and elemental fluorine
PRESSURE RESISTANCEresistant within the usual pressure range of standard flanges up to 40 bars; suitable for vacuum applications (depends upon the concrete installation conditions)
PHYSIOLOGICALLY INERTphysiologically harmless in all recommended applications