Klüber Unisilkon L 643


Klüber Unisilkon L 643 is a sealing and dampening grease valves and fittings


Benefits for your application

  • Excellent wetting power
  • Operational smoothness due to a good viscosity-temperature behaviour
  • Excellent resistant to hot and cold water, steam
  • High thermal stability
  • Good sealing effect
  • Neutral towards metals, elastomers and plastics




UNISILKON L 643 is a special lubricating grease based on silicone oil and PTFE for valves and other elements in the sanitary and heating sector. It offers good penetration ability in small lubrication gaps and lube points of difficult access. As its viscosity is rather independent from service temperatures, UNISILKON L 643 allows constant actuating forces within the whole cold/hot water range of single-lever mixer taps. The grease is resistant to many aqueous solutions as well as acid and alkaline disinfectants. It is not compatible with most organic solvents, strong acid and alkaline solutions.




UNISILKON L 643 is used as sealing grease and assembly aid for seals and packings in contact with cold and hot water as well as steam. It is suitable for industrial installations, e.g. ball valves, heating and thermostat valves, tap cocks and press fit seals, in hydraulics as sealing grease for radial shaft seals, thermo regulators and elements of mixing taps.


Application notes


UNISILKON L 643 is neutral towards most metals, thermoplastics and elastomers. Owing to the many different
elastomer and plastic compositions their compatibility should be checked prior to series applications. UNISILKON L 643 can be applied by means of spatula, brush, usual metering devices or the tampon printing method. Please observe the material safety data sheet.



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