Hello Dave,

Thanks for the reply, is the FOS test appropriate for any common PCB plated 
finish?

Thanks,

ALsdair

-----Original Message----- 
From: David Hillman
Sent: Tuesday, August 14, 2018 1:29 PM
To: [log in to unmask]
Subject: Re: [TN] Flowers of Sulfur test

Hello Alasdair - I would think that a FOS test on an immersion silver
surface finish would not be an appropriate test as silver and sulfur do not
like each other. The appropriate testing for printed circuit board surface
finishes would be found in the IPC-45XX specification series.

Dave Hillman
Rockwell Collins
[log in to unmask]

On Tue, Aug 14, 2018 at 7:25 AM, FTL Quality <[log in to unmask]
> wrote:

> We've been asked whether we use the flowers of sulfur test to check our
> plating.
>
> Does anyone use this test for ENig, Pure Hard Gold, or Silver plating?
>
> I've got doubts as to whether completing this test would give any sort of
> answer in any case as ENig is known to not withstand normal humidity
> testing.
>
> Thanks,
>
> Alasdair
>