Structure Probe Inc.

Y-VAC™ 3 Vacuum Grease from the Fomblin® Family

Further information about Y-VAC 3 and technical specifications

Fomblin® Y-VAC™ 3 is an inert, PTFE-thickened, homogeneous white grease particularly suitable for use as a lubricant for mechanical parts or seals operating at high vacuum and in contact with aggressive chemicals or oxygen. Y-VAC 3 is used in lubricated "for life" applications; its lubricating properties make it suitable for parts requiring boundary (extreme pressure) lubrication in a temperature range from -20°C to 250°C. Y-VAC 3 is designed to meet MIL-G-27617 Type III specifications and test method ASTM E-595-77 as tested by NASA/GSFC (extremely low outgassing in a vacuum environment). Before making any decision about your vacuum grease requirements, be sure to be aware of some of the other information and specifications concerning Y-VAC 3 high vacuum grease.

Other important properties include:
  • Chemical inertness
  • High dielectric properties
  • Non-flammability
  • Low surface tension
  • High thermal stability
  • Good aqueous and non-aqueous solvent resistance
  • Low toxicity
  • Excellent compatibility with metals, plastics, elastomers
  • Good radiation stability
  • Low volatility
  • Clean-up with ozone-safe Fomblin
    Perfluorosolv™ Solvents

    • Typical properties of Fomblin Y-VAC 3 High Vacuum Grease are as follows:
    Properties                                 Typical Values

Consistency, NLGI Grade                          3

Base oil viscosity (ASTM D445)
   cSt @ 20° C                                1400
   cSt @ 40° C                                 410

Vapor pressure  @ 20° C (torr)                5x10-13

Penetration (ASTM D217)
    Unworked (mm/10)                           240
    Worked 60 strokes (mm/10)                  240
    Stability after 10,000 strokes (mm/10)     260

Apparent viscosity poise at  20° C
    Shear rate 100 sec-1                        280
    Shear rate 300 sec-1                        140

Evaporation loss (ASTM D2595)
    22 hours at 204° C (wt %)                  0.3%

Oil Separation (FTMS 791-321
    30 hours at 204° C (wt %)                  8%

Continuous operation range:               -20° C to 250° C


    Caution: All information contained herein is, to the best of our knowledge and belief, accurate. Since the conditions of handling and of use are beyond our control, we make no guarantee of results. We assume no liability for damages or penalties resulting from following our suggestions or recommendations, nor are these to be taken as a license to operate under, or recommendations to infringe any patent. Fomblin and Perfluorosolv are trademarks of Ausimont USA, Inc. and are EQNET ISO9002 Certified.

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    Saturday March 20, 2010
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