Use either of these two pump fluids with confidence for all mechanical pumps
pumping out diffusion pumps except for those diffusion pumps that are
charged with perfluorinated polyether (PPE) pump fluids
(e.g. Fomblin®, Krytox®, or SPI-Tox™).
There is a fundamental incompatibility between fluorocarbon based pump fluids vs.
hydrocarbon based pump fluids and the two fluids should not be mixed.
Similarly, if you have a pump presently charged with one of the
perfluorinated polyether that you want to convert to hydrocarbon usage, it
is nearly impossible to clean the pump of the original fluid well enough for
it ever to be able to run properly on a pure hydrocarbon pump fluid.
Comments about vacuum greases:
Make sure your vacuum greases are "compatible" with the fluid you are using,
in this case the fluids being hydrocarbon fluids. We would recommend use of
one of the hydrocarbon based Apiezon® greases
or even the highly stable
Santovac® 5GB high vacuum grease
for use with vacuum systems charged with hydrocarbon fluids.
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