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May 2013

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From:
"David D. Hillman" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, [log in to unmask]
Date:
Tue, 7 May 2013 14:35:23 -0500
Content-Type:
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Hi Victor - there was a couple of industry papers on the attack of the 
silver termination on resistors at the SMTAI and APEX conferences in the 
last couple of years - sure sounds like you are describing exactly the 
same issue. I'll see if I can find the references.

Dave



From:   Victor Hernandez <[log in to unmask]>
To:     <[log in to unmask]>
Date:   05/07/2013 02:25 PM
Subject:        Re: [TN] Solder mask contain low levels of sulfur
Sent by:        TechNet <[log in to unmask]>



The silver end termination on a ceramic resistor appears to be 
corroded/tarnish near the protective coating overlay.  I suspect sulfur 
but not sure from where, the environment or solder mask.   well aware of 
Barium Sulfate.

Victor,

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Stadem, Richard D.
Sent: Tuesday, May 07, 2013 9:58 AM
To: [log in to unmask]
Subject: Re: [TN] Solder mask contain low levels of sulfur

Assuming that is Victor's concern. He has not said yet what the concern is 
of the sulfur content of the mask.
But I totally agree with Doug's clarification. 
From his perch high on Mount Decorah, King Pauls knows all and sees all 
and has spies everywhere.

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Vladimir Igoshev
Sent: Tuesday, May 07, 2013 9:27 AM
To: [log in to unmask]
Subject: Re: [TN] Solder mask contain low levels of sulfur

Doug,

S is always in a solder mask (at least I saw it on a very large number of 
different boards with EDS).
Regards,

Vladimir

SENTEC Testing Laboratory Inc.
11 Canadian Road, Unit 7.
Scarborough, ON M1R 5G1
Tel: (647) 495-8727
Cell: (416) 899-1882
www.sentec.ca

-----Original Message-----
From: Douglas Pauls <[log in to unmask]>
Sender: TechNet <[log in to unmask]>
Date: Tue, 7 May 2013 09:05:12
To: <[log in to unmask]>
Reply-To: TechNet E-Mail Forum <[log in to unmask]>,
        <[log in to unmask]>
Subject: Re: [TN] Solder mask contain low levels of sulfur

Well, if the sulfur is chemically bound into the mask, then I would agree. 

 But if the sulfur is there from an outside source, such as sulfur bearing 
cardboard or paper, rubber bands, or sulfur from pollutant gasses, then 
that sulfur is not bound and is free to do chemical damage and tarnish 
silver.  So it all depends on whether it is IN the mask or ON the mask.

Doug Pauls



From:   "Stadem, Richard D." <[log in to unmask]>
To:     <[log in to unmask]>
Date:   05/07/2013 08:09 AM
Subject:        Re: [TN] Solder mask contain low levels of sulfur
Sent by:        TechNet <[log in to unmask]>



If you are concerned with the soldermask sulfur affecting an IAg finish, 
there is no concern. The amount of sulfur is typically too low, and being 
bound, does not affect the finish.

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Vladimir Igoshev
Sent: Tuesday, May 07, 2013 7:55 AM
To: [log in to unmask]
Subject: Re: [TN] Solder mask contain low levels of sulfur

From what I know the answer is "Yes"
Regards,

Vladimir

SENTEC Testing Laboratory Inc.
11 Canadian Road, Unit 7.
Scarborough, ON M1R 5G1
Tel: (647) 495-8727
Cell: (416) 899-1882
www.sentec.ca

-----Original Message-----
From: Victor Hernandez <[log in to unmask]>
Sender: TechNet <[log in to unmask]>
Date: Tue, 7 May 2013 07:46:23
To: <[log in to unmask]>
Reply-To: TechNet E-Mail Forum <[log in to unmask]>,
        <[log in to unmask]>
Subject: [TN] Solder mask contain low levels of sulfur

Fellow TechNetters:

   We are doing some preliminary investigation of solder mask and have 
found out that it contains low levels of sulfur.   Not sure what sulfur 
constituents.   Is This a typical finding of sulfur?

Victor,

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