Tom,

Thanks for the contacts,

Best regards,

Alasdair

-----Original Message----- 
From: Tom Newton
Sent: Tuesday, August 14, 2018 5:07 PM
To: FTL Quality
Subject: RE: [TN] Flowers of Sulfur test

Alastair and all:

I am just now seeing your question string on FOS testing with various 
surface finishes, including immersion silver.  The FOS test is one of two 
tests being used by the 3-11g Corrosion of Metal Finishes Task Group that is 
Chaired by Bev Christian of HDP User Group ([log in to unmask]) and 
Vice Chaired by Helen Holder of Hewlett-Packard ([log in to unmask]). 
Neither one of these two intentionally corrosion-causing tests are being 
recommended as a standard test for production or quality control of any 
plated surface finish.  Please contact either or both of these people for 
more details on the reason why they are using the FOS test.   Both of these 
people are 'on' TechNet but are apparently away from the access, at this 
point.

Best Regards;

Tom Newton

-----Original Message-----
From: TechNet <[log in to unmask]> On Behalf Of FTL Quality
Sent: Tuesday, August 14, 2018 8:34 AM
To: Technet <[log in to unmask]>
Subject: Re: [TN] Flowers of Sulfur test

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
>