SIL-LUB 704 Silicone Diffusion Pump Fluid


SIL-LUB 704 is a Silicone diffusion fluid is single component fluid for high vacuums of 10-6 to 10-8 torr (untrapped), and 10-10 torr (trapped). It performs well in tough rugged applications; offers quick pumpdown, even after exposure to air at operating temperature.

SIL-LUB 704 offers following benefits:

  • Shorter conditioning runs... single component silicone fluid reach maximum potential in far less time than that required for multi-component organic fluids.
  • Faster pumping…diffusion pumps using silicone fluids can operate against 20 to 300 percent higher forpressures than those using organic fluids. For higher gas throughput at the high-pressure end of the pump’s operating range. Heater input can be increased 20 to 30 percent.
  • Minimum back streaming… the vapour pressure of SIL-LUB 704 single component silicone fluid is so low that the use of traps – or refrigeration of existing traps – is unnecessary for many applications.
  • Longer service life… thermal and chemical stability of silicone fluids allows exceptionally long runs without deterioration or contamination.
Faster cycling reduced down-time, less frequent fluid replacement…the recovery rate of silicone fluid after exposure to air at operating temperature is many times faster than that of organic fluids. Time is saved between cycles because the
  • outstanding resistance of SIL-LUB 704 to oxidation and hydrolysis allows release of the vacuum without cooling the pump.

SIL-LUB 704 can be used in variety of applications including:

  • Aerospace : Space simulation chambers
  • Electronics: Evacuating television and cathode-ray tubes, Vapor deposition of thin films by sputtering or evaporation in devices and microcircuits.
  • Metallurgy: Electron-beam operations, high vacuum furnaces, melting, degassing and sintering refractory metals; thick film deposition.
  • Vacuum Coating: Aluminizing television tubes, Optical coatings, Decorative coatings for novelties, automobile parts, plastics & metal sheets.

Research: Ultrahigh vacuum and ultra clean vacuum for thin film, lubrication and metal fatigue studies. Thermonuclear, plasma physics.


Colour      Clear
Vapor Pressure @25°C 2x10-8 torr
 Boiling Point @0.1 torr   220°C
Viscosity at 40°C   24.2 CST
Viscosity at 100°C 6.2 CST
Pour Point   <-9°C
Flash Point   221°C
Fire Point  None
Density 1.07 g/ml.
     Molecular weight   485.