Diffusion Pump Fluids
Diffusion pump fluids including Diffoil-20, Apiezon, Edwards, Silicone oils and Santovac5 oils.
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Diffoil-20 Ultra is a double-distilled, high-grade, hydrocracked oil and is ideal for use in diffusion pumps but can also be used in two-stage rotary vane pumps. It allows low ultimate pressures and suits the very clean systems required in optical coating, sputter and e-beam coating, and analytical instrumentation.
Apiezon AP-201 is based on a hydrocarbon oil but unlike other Apiezon hydrocarbon oils it is strongly resistant to oxidation.
Edwards L9 diffusion pump fluid is a naphthalene based synthetic material which is ideal for use in applications where silicone forming insulating films cannot be tolerated.
Silicone oil
Silicone oils are in wide use in vacuum systems but should be avoided in electron microscopes as an insulating layer may be formed in critical parts of the column.
Santovac® 5 oil
For some applications, a diffusion pump oil with exceptionally low vapour pressure may be necessary. One such oil is Santovac 5, a polyphenyl ether. It has exceptional thermal stability and a lower tendency to creep than other oils. If this oil is to replace a dissimilar oil, the diffusion pump must be thoroughly cleaned to ensure that it is free of the old oil before charging with Santovac.
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