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Dow Corning® Silicone Fluids

Very high stability compared to other fluids



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The Dow Corning® fluids exhibit outstanding oxidation resistance at elevated temperatures for a moderate cost. However, it is generally not recommended that this family of fluids be used in an electron microscope column for several different reasons:
  • If the column should be accidentally flooded with pump fluid (e.g. the result of a vacuum failure), it is far more difficult to clean up than if using hydrocarbon fluid.

  • If you are doing EDS work, you are very likely from them on to see a Si peak in all EDS spectra, something not especially attractive should you have the need also to be making measurements on Si containing samples.

  • If using silicone fluids in a vacuum evaporator and you are making carbon films which will later be analyzed by EDS, it is nearly impossible to obtain Si-free carbon films under those circumstances. Furthermore, these fluids should not be used in a mechanical pump which would mean that would be a basic incompatibility between the fluid in the diffusion pump vs. the fluid in the mechanical pump.


Differences between DC 704 vs. DC 705:

DC 704 DC 705
Chemical composition: Tetramethyl tetraphenyl trisiloxane Pentaphenyl trimethyl trisiloxane
Vapor pressure: 2 x 10-8 torr 3 x 10-10 torr
Boiling Point @ 0.5 torr: 215° C/419° F 245° C/473° F
Flash Point: 221° C/430° F 243° C/470° F
Specific Gravity: 1.07 g/ml 1.09 g/ml
Viscosity @ 25° C 39 cSt 175 cSt
Refractive Index @ 25° C 1.577 -1.580 1.555 - 1.588
Color Clear Clear
Thermal Expansion Coefficient: 0.00077 cc/cc/°C 0.00096 cc/cc/°C
Rotary Vane Pumps: Not Recommended Not Recommended


So while the fluids are really great if you are able to use them, we do want to point out their down side (see above).

Available products:
SizeSPI #EachIn Stock
DC #704100 cc00051-MB$ 36.06 Add to cartYes
500 cc 00051-RA 128.77 Add to cartYes

DC #705100 cc00061-MB$ 66.96 Add to cartYes
500 cc 00061-RA   322.54 Add to cartYes

When using Dow Corning fluids, be sure to use the silicone compatible greases as well.


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Tuesday May 13, 2008
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