Klüber Unisilkon L 641


Klüber Unisilkon L 641 is a special lubricating grease for tap water, beverage and heating valves


Benefits for your application


  • Excellent wetting power
  • Operational smoothness due to a good viscosity-temperature behaviour
  • Very good resistance to water and water vapour
  • High thermal stability
  • Good sealing effect
  • Neutral towards metals, elastomers and plastics
  • NSF H1 registered
  • Tested acc. to the guideline of the German Environmental Agency (UBA), WRAS, ACS and NSF Standard 61




UNISILKON L 641 is a special lubricating grease based on silicone oil and PTFE for valves and other elements in the heating, beverage and sanitary sector. UNISILKON L 641 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 641 allows constant actuating forces within the whole cold/hot water range of singlelever mixer taps. The grease is compatible with most substances in the food-processing and beverage industries like beer, milk, juices, liquors, acid and alkaline disinfectants. UNISILKON L 641 is not compatible with most organic solvents as well as acid and alkaline solutions.

UNISILKON L 641 is NSF H1 registered and therefore complies with FDA 21 CFR § 178.3570. The lubricant was developed for incidental contact with products and packaging materials in the food-processing, cosmetics, pharmaceutical or animal feed industries. The use of UNISILKON L 641 can contribute to increase reliability of your production processes. Wenevertheless recommend conducting an additional risk analysis, e.g. HACCP.




UNISILKON L 641 is used as sealing and assembly aid for seals and packings in contact with water or water vapour, e.g.:

domestic installations – ball valves; single-lever mixers – piston cartouches, ceramic discs; mixer taps with two handles – swivel spouts, shower switches, shower heads; thermostatic mixer taps – thermo regulators and elements; heating – thermostatic valves, tap cocks, pressfit seals; water hydraulics – sealing grease for radial shaft seals.


Application notes


UNISILKON L 641 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 641 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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