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Oerlikon Leybold Diffusion Pump OilsPump Fluids for Diffusion PumpsPump fluids for oil diffusion pumps must exhibit a low vapor pressure at room temperature and must be able to resist thermal decomposition and oxidization to a large extent. Surface tension of the pump fluids must be high to reduce creep of oil films. They must be chemically inert, exhibit high flash point and evaporation heat must be low. Moreover, the pump fluids should permit high pumping speeds over a wide range of pressures and be cost effective. One type of pump fluid alone cannot meet these comprehensive requirements. It is therefore required to select a pump fluid according to the operating pressure and the requirements of the application in each case. The pump fluids given below are subjected to an extensive series of tests in our factory laboratories under conditions commonly encountered in practice by diffusion pumps. We recommend the use of the pump fluids specifically qualified by Oerlikon Leybold Vacuum, since only this will ensure that the specifications will be met by our diffusion pumps in practice. Equally we recommend the use of qualified pump fluids to attain the optimum oil change intervals and prevent the accumulation of unwanted deposits. To see the Material Safety Data Sheet (MSDS) for each fluid, click on the name of the fluid. Mineral Oil Pump Fluid DIFFELEN The various types of this kind of pump fluid are closely toleranced fractions of a high quality base product distilled with particular care. During the distillation process the pressure and temperature conditions are maintained continuously within close limits, so that individual fractions are obtained which are of consistent quality. DIFFELEN normal is the most frequently used pump fluid. It is the ideal pump fluid for high vacuum applications. The attainable ultimate pressure is below 10-7 mbar (0.75 x 10-7 Torr). DIFFELEN ultra is used in connection with ultra-high vacuum pump systems. With a water-cooled baffle the attainable ultimate pressure is about 10-8 mbar (0.75 x 10-8 Torr). Polyphenylether ULTRALEN is a high-quality pump fluid based on a polyphenylether for operation in the high vacuum range. It excels through its very high resistance against oxidation, thermal decomposition and chemical attack, and exhibits an exceptionally low vapor pressure. HE-300 is a polyphenyl ether synthetic diffusion pump fluid capable of producing ultra high vacuum in the 10-10 torr range. Due to this fluid's extremely low vapor pressure, backstreaming characteristics are lower than any other fluid resulting in less contamination and longer operation. HE-300 ideal for use in many applications including laboratory, analytical and research operation, vacuum production, thin films, space simulation chambers, and optical coatings. French MSDS Other major advantages beyond an ultra high vacuum are the following:
Silicone Oil Silicone oil differs from DIFFELEN oil in that silicone oil is a defined chemical compound which is extremely resistant to decomposition. Because of the extremely low vapor pressure, silicone oil is especially well suited as a pump fluid in diffusion pumps. Even after a great number of air inrushes, silicone oil will remain unaffected by aging even when subjected to mass spectrometric analysis. DC 704 is a pump fluid for high vacuum and ultra-high vacuum applications with stringent requirements concerning resistance against oxidization and de-composition. DC 705 is a special pump fluid (an organic silicon compound) for ultra-high vacuum applications which require an extremely low vapor pressure together with stringent requirements concerning resistance against oxidization and decomposition. |
Vacuum Products Canada Inc. www.vpcinc.ca
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