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ENIG hardness versus Hard Gold hardness

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#80368

ENIG hardness versus Hard Gold hardness | 9 May, 2018

I would like to know the hardness figures of ENIG finish and hard gold finish. I can find the hard gold finish number and it appears to be 130-200 knoop. But what about ENIG finish?

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#80369

ENIG hardness versus Hard Gold hardness | 9 May, 2018

You can't find a hardness spec for immersion gold [ImAu] because no one cares. The ImAu dissolves into the solder during thermal processing. Pressed, I'd guess for that ImAu hardness is about that of soft gold

* Soft: 50-90 knoop

* Hard: 130-200 knoop

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