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Vacuum Pump Fluids
Krytox® PFPE Vacuum Pump Fluids
TMC 704 Silicone
Diffusion Pump Fluids
TMC 705 Silicone
Diffusion Pump Fluids
Halovac® CTFE Vacuum Pump Oils 





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TMC 705 Silicone Diffusion Pump Fluids
TMC 705 diffusion pump fluid a single component, pentaphenyl trimethyl trisiloxane, clear silicone fluid developed for use in ultra-high vacuum of 10-9 torr (untrapped) and 10-11 torr (trapped). TMC 705 is superior to Dow Corning® DC-705 and other diffusion pump fluids that are blends often containing significant amounts of materials originating from China.

TMC-705 performs well in high purity metalizing applications where quick pump-down is needed, as well as thermal, radiation and chemical stability.

Because of its low vapor pressure, TMC-705 can reduce the chances for contamination in untrapped systems by a factor of 100 or more compared to TMC-704 and other fluids. The vapor pressure is so low, that deepest vacuum levels can be obtained with water cooled baffles alone.


Using TMC Industries' reclamation services, TMC 705 can be reclaimed many times saving you money and disposal. 

 TMC 705 (DC-705) one gallon

 Product Datasheet



  • Thermally and chemically stable
  • Ideal for high gas load applications
  • Quick pump-down
  • Pump jets stay clean
  • Chemically equivalent to Dow Corning® DC-705
  • Low Cost
  • Reclamation available by TMC Industries, Inc.

Vapor Pressure @ 25° C (77°F)  10-8 to 10-10 Torr
Viscosity @ 25° C (77°F)  160 cSt
Boiling Point @ 0.5 Torr  243° C (469ºF)
Specific Gravity @ 25° C (77°F)  1.097
Flash Point (open cup)  >240° C (464ºF)
Color  Light straw



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