Silicone 704

Features and Benefits

  • Silicone 704 is a Tetramethyltetraphenyltrisiloxane based fluid for producing high vacuums in the range 10-7 to 10-8 mbar. This fluids exhibits extreme chemical, thermal, oxidation, hydrolysis and radiation resistance. It also has extremely low back-streaming properties.


  • Silicone 704 is intended for use in particularly tough, rugged applications including vapour deposition of thin films by sputtering or evaporation, electron beam operations and high vacuum furnaces, melting, degassing and sintering, refractory metals and thick film deposition.
  • It is also suitable for all aspects of vacuum coating such as optics and automotive components and the UHV characteristics are particularly useful for thin film, surface technology, thermonuclear and plasma physics applications.
Technical data  
Typical ultimate vacuum achievable at 20°C (mbar) 8.0 x 10-9
Vapour pressure @ 25°C (mbar) 1 x 10-9
Boiling temperature at 1.3 mbar (°C) (approx) 215
Viscosity cSt @ 25°C 37 - 42
Pour point °C -34
Flash point °C >210
Specific gravity at 25°C 1.06 - 1.07