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KWO® MultiTex® DK Ring

ePTFE Gasket Ring for steam vessels

KWO® MultiTex® DK Ring is a high quality gasket material made from biaxially expanded PTFE. The ring is especially designed for the sealing of steam boiler plugs.
KWO® MultiTex® DK gasket ring has been tested and homologised with the "d" rating for temperatures up to 250°C and 40 bar in accordance with the requirements of VdTÜV “Dichtung 100” instructions (formerly TRD401). This gasket ring is suitable to seal man hole, head hole and hand hole covers of steam boilers. The flexible material adapts excellently to sealing surfaces and compensates for any unevenness of the cover or flange surface.

The ring ensures a very high tightness immediately after the installation and is particularly suitable for the pressure test with cold water. KWO® MultiTex® DK ring offers a lasting tightness under operating conditions and in applications with changing temperatures.


  • excellent tightness from the installation on
  • very good adaptability to rough sealing faces
  • available for standard sizes of covers and plugs
  • avoids corrosion of the sealing surfaces
  • resistant to stress due to changing temperatures
  • easy installation
  • less cleaning time after removal of gasket ring
  • 100 % biaxial expanded PTFE (ePTFE) without fillers
  • high quality biaxial expanded gasket ring
  • form-fitting ring without interface
  • sealing system - especially for steam vessels
  • non-ageing - unlimited storage time
  • non-flammable


  • steam vessels
  • silo systems, as well for food processing systems
  • proven and admitted by TÜV, correspond to test class "d"
  • VdTÜV  Merkblatt Dichtung 100 (formerly known asTRD 401)
  • testes for an increased gab between lid and flange
  • certificated & monitored by TÜV ISO 9001
  • gasket characteristics pursuant to DIN EN 13555
  • compliant to FDA
  • EC1935/2004 - suitbale for applications with food contact

Technical Data

RAW MATERIAL100 % bixaial expanded PTFE (ePTFE) without fillers
TEMPERATURE RANGErecommended temperature +250°C and internal pressure 40 bar
CHEMICAL RESISTANCEpH range from 0 to 14; full chemical resistance for all sorts of boiler water, except molten alkali metals and elemental fluorine
PRESSURE RESISTANCEcertificated for steam vessels with internal pressure up to 40 bar and cold water test up to 88 bar
PHYSIOLOGICALLY INERTphysiologically harmless in all recommended applications