[c0n5pir4cy]

Also some companies like 3M actually make a collection of liquids specifically for immersion cooling in data centres, so it's mature enough that people are happy to use it even in a data centre setting.

[CamperBob2]

I wonder if any of those coolant varieties survived the recent jihad against fluorochemicals. AFAIK 3M is out of the business entirely at this point.

[monocasa]

Very mature, going back to at least 1985 in the Cray-2.