SMALL PUMPS AND
PUMPING SYSTEMS
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INDUSTRIAL PUMPS AND PUMPING SYSTEMS
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CHEMICAL PUMPS AND PUMPING SYSTEMS
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SEMICONDUCTOR PUMPS
AND EXHAUST MANAGEMENT
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BOC Edwards supplies a range of fluids of different vapor pressures and physical properties. From this range, you can choose the optimum fluid for your applications.
In general, the more volatile fluids are used with vapor booster pumps and for vapor diffusion pumps used on industrial processes (for example, decorative coating and vacuum furnaces) where high gas loads are encountered and high critical backing pressure is advantageous. The less volatile fluids are used for processes or experiments requiring more exacting high vacuum conditions. |
The least volatile fluids are used for clean or ultra high vacuum applications (mass spectrometry, electron probe apparatus, surface studies, and so forth). Fluid selection depends also on the particular physical and chemical characteristics of the fluids (apart from vapor pressure).
BOC Edwards has a long history of co operation with various fluid manufacturers in the development of new pumping fluids and is well placed to advise in cases of uncertainty. |
AP201 VAPOR BOOSTER PUMP FLUID
Apiezon® AP201 is a hydrocarbon fluid prepared by molecular distillation and protected against oxidation by a thermally stable additive of matched vapor pressure. It has an auto ignition temperature of 305 °C. It exhibits a fair degree of resistance to chemical degradation (so that high throughputs of air and water vapor can be pumped without damage to the fluid) and it can withstand limited accidental admission of atmospheric air at operating temperature. The fluid has low viscosity which permits easy filling and draining. It does not attack synthetic rubbers used for seals and gaskets in vacuum systems. It is non-irritant, non-toxic and environmentally non-polluting. |
SILICONE DC702, DC704EU AND DC705 DIFFUSION PUMP FLUIDS
These synthetic fluids are organo-silicon oxide polymers and have exceptional chemical stability both at high temperature and when in contact with most gases and vapors. They provide a range of general purpose fluids for ultimate vacuum from about 10-5 to 10-9 mbar, and are particularly useful in industrial processing applications due to their exceptional ruggedness.
High throughputs of air, water vapor and corrosive gases can be pumped without fluid degradation. The fluids can withstand repeated admission of atmospheric air while at operating temperature and are widely used in valveless quick-cycle pumping processes. They have low toxicity and good resistance to gamma radiation. Fluid breakdown products (due to bombardment and so on) tend to be electrically insulating and so we do not recommend these fluids for physical electronic applications such as mass spectrometers and surface analysis systems. The fluids are indifferent lubricants. Their decomposition is catalyzed by traces of alkali metals (for example, caesium) and their use should be avoided where possible. |
SANTOVAC® 5 DIFFUSION PUMP FLUID
This synthetic fluid is a polyphenyl ether developed from fluids originally produced as lubricants for space vehicles. It has exceptionally low vapor pressure, exceptional thermal stability and a tendency to wet surfaces less readily and ‘creep’ to a lesser extent than is common with most fluids. The fluid is employed for the cleanest high vacuum and ultra high vacuum applications down to less than 10-9 mbar (for example, electron microscopes, mass spectrometers and surface physics studies) where its excellent high vacuum performance and low tendency to migrate into the pump system
particularly recommend it. The fluid is chemically stable, non-corrosive, safe and non-toxic at normal operating temperatures. Fluid breakdown products (due to bombardment and so forth) tend to be electrically conducting. Lubricating qualities are good and the fluid finds application to lubricate mechanisms in vacuum systems.
Use high purity Santovac® P5 Ultra for the most exacting mass spectrometry applications. Contact BOC Edwards for more details and for ordering information. |
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