Is the solder mask UV cured?
Joyce Koo
Researcher
Materials Interconnect Lab
Office: (519) 888-7465 79945
BlackBerry: (226) 220-4760
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of David D. Hillman
Sent: Tuesday, May 07, 2013 3:35 PM
To: [log in to unmask]
Subject: Re: [TN] Solder mask contain low levels of sulfur
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,
______________________________________________________________________
This email has been scanned by the Symantec Email Security.cloud service.
For more information please contact helpdesk at x2960 or [log in to unmask]
______________________________________________________________________
______________________________________________________________________
This email has been scanned by the Symantec Email Security.cloud service.
For more information please contact helpdesk at x2960 or [log in to unmask]
______________________________________________________________________
______________________________________________________________________
This email has been scanned by the Symantec Email Security.cloud service.
For more information please contact helpdesk at x2960 or [log in to unmask]
______________________________________________________________________
______________________________________________________________________
This email has been scanned by the Symantec Email Security.cloud service.
For more information please contact helpdesk at x2960 or [log in to unmask]
______________________________________________________________________
______________________________________________________________________
This email has been scanned by the Symantec Email Security.cloud service.
For more information please contact helpdesk at x2960 or [log in to unmask]
______________________________________________________________________
______________________________________________________________________
This email has been scanned by the Symantec Email Security.cloud service.
For more information please contact helpdesk at x2960 or [log in to unmask]
______________________________________________________________________
______________________________________________________________________
This email has been scanned by the Symantec Email Security.cloud service.
For more information please contact helpdesk at x2960 or [log in to unmask]
______________________________________________________________________
______________________________________________________________________
This email has been scanned by the Symantec Email Security.cloud service.
For more information please contact helpdesk at x2960 or [log in to unmask]
______________________________________________________________________
---------------------------------------------------------------------
This transmission (including any attachments) may contain confidential information, privileged material (including material protected by the solicitor-client or other applicable privileges), or constitute non-public information. Any use of this information by anyone other than the intended recipient is prohibited. If you have received this transmission in error, please immediately reply to the sender and delete this information from your system. Use, dissemination, distribution, or reproduction of this transmission by unintended recipients is not authorized and may be unlawful.
______________________________________________________________________
This email has been scanned by the Symantec Email Security.cloud service.
For more information please contact helpdesk at x2960 or [log in to unmask]
______________________________________________________________________
|