Well I have been harrassing some industrial chemists in the hope of finding some alternatives, so far best suggestions are solvent style hydrocarbon dilectics (should minimise residual), isoparrafins are the other suggestion to date, they are checking out some specifications for me and I should have some details soon. ECM (electro cutting machine?) fluid is another option, it has good heat transferance properties but a little higher residual than id like.
All have good viscosity at around 0c and run out at a couple of bucks a litre.
Will let you know what the chemists come up with.
Saw a review of the OCZ immersion cooled rig,
they have gone for a mineral oil as well, no detail on what type thou. Apparently they plan to bring out a DIY kit as well in a couple of months.
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