Hi Yuan,

Most likely used in a standard industrial/assembly environment. Definitely 
not space, paper industries or mining.

Thanks,

Alasdair

-----Original Message----- 
From: Yuan-chia Joyce Koo
Sent: Tuesday, August 14, 2018 3:44 PM
To: TechNet E-Mail Forum ; FTL Quality
Subject: Re: [TN] Flowers of Sulfur test

is your board used on mars?  or your board used on pulp and paper, or
your board is used under mining/oil and gas condition?  if it is and
you have no other protection at system level for your PWA (conformal
coating or hermetic seal), you might need to consider it.  (your
designer can tell you that).  IMHO.
jk
On Aug 14, 2018, at 9:34 AM, FTL Quality wrote:

> 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