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. 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