Abstract
It is shown that the power input of a diffusion pump charged with perfluoro polyether (PFPE) can be greatly reduced without unduly affecting the performance and by careful choice of power and fluid charge vibrations from the boiling fluid can be kept to a minimum. Various grades of PFPE have been assessed as rotary pump fluids and a grade (Y VAC 06/6) identified as a suitable substitute for mineral oil in rotary pumps. Its chemical stability and the resultant advantages and limitations are discussed. It is physiologically inert but under high temperatures, like all fluorocarbons, breaks down to toxic gases.
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