precisely. solder has a very high surface tension (ever seen mercury? solder is basically the same over liquidus temp) and balls up anywhere it doesn't wet a surface, since that minimizes surface energy
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and i saw the website for the fluid you said you used, nice, you can get them in various boiling points
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yep yep. can also use them to cool PCBs by submerging in the liquid, it's absurdly efficient AND it's an incredibly good dielectric. people cool CO2 lasers with it too
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it's also nearly harmless (so long as you don't overheat it). they can carry a lot of dissolved oxygen and there's a picture from an old paper where a mouse is breathing oxygenated fluorinert in a beaker.
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so you put the board like, above the liquid and let the vapour just condense on it?
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exactly. and it has such a low affinity to PCBs and components that when you turn it off and let it cool the liquid returns back to the pool below all by itself, you just need to shake it gently when lifting.
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