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Dow Corning DC 704 Silicone Pump Fluid

Discontinued Product KJLC no longer offers the Dow Corning DC Silicone Pump Fluids. Please consider the KJLC 704 as a possible alternative and feel free to contact KJLC at with any additional questions.

Tetramethyl tetraphenyl trisiloxane—an ideal fluid for aggressive applications.


  • Used in medium and large pumping speed diffusion pumps in a wide variety of research and production applications, as lower attainable pressure justifies the additional expense of this excellent fluid
  • High resistance to oxidation and hydrolysis at operating temperature
  • Ideal fluid for aggressive applications requiring ultimate pressures (without trapping) in the 10-7 Torr range
  • With first class LN2 traps, chamber pressures can approach 10-11 Torr range
  • Applications include vacuum metal casting, diffusion bonding, and instruments (electron microscopes, TOF mass spectrometers, etc.)

NOTE: Do not use silicone fluids in mechanical pumps.

Specifications Table

Vapor Pressure
@25°C: 2 x 10-8
Pour Point
Flash Point
Boiling Point
@0.5 Torr (°C): 215
Fire Point
Specific Gravity
1.07 (g/cc)
39 cSt @ 25°C
Hazardous Ingredients

Shelf Life

It is strongly recommended using all fluids and greases at the time of receipt, however when storage is necessary, rotate older stock into use first and observe the recommended parameters listed below.

Silicone Oils & Grease

Shelf life is minimum 5 years when material is kept in original container and stored at normal, ambient temperatures out of direct sunlight.

When stored under normal warehouse conditions, Dow Corning High Vacuum Grease has a shelf life of 60 months from date of manufacture, which is marked on each tube.

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