Hi Carl, As XRF analyzes relatively deep layers, one can not tell where As could be coming from. You'd have to do proper analysis to establish the root cause for the problem. Vladimir SENTEC Testing Laboratory Inc. 11 Canadian Road, Unit 7. Scarborough, ON M1R 5G1 Tel: (416) 899-1882 Fax: (905) 882-8812 www.sentec.ca -----Original Message----- From: Carl Ray <[log in to unmask]> Date: Tue, 8 Jun 2010 11:44:21 To: <[log in to unmask]> Subject: [TN] Arsenic from XRF Testing All, I have a question. We were seeing some solderability issues with some components that were provided by our customer. These devices were Sn-Pb over Cu plating per the data sheet. We tested 3 samples and noticed where all three samples have very high concentration of Arsenic. Some as much 4-5%. What could possibly be the cause for this? I understand Arsenic is used during plating process but I did not think it was as significant as 4-5%. Carl Ray Staff Engineer Teledyne Electronic Manufacturing Services 1425 Higgs Rd. Lewisburg, TN 37091 Direct: 931-270-2724 Cell: 931-637-5958 Email: [log in to unmask]<mailto:[log in to unmask]> ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________ --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 ----------------------------------------------------- ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________