How are you measuring your tin and lead contents? Per ASTM standards for wet chemical analysis, there are special precautions required for collecting a sample for chemical analysis to insure it is representative of the mass. Could your analysis method or sampling technique be in error? Wade Oberle -----Original Message----- From: <Jason M. Smith> [SMTP:[log in to unmask]] Sent: Wednesday, February 10, 1999 6:50 AM To: [log in to unmask] Subject: Re: [TN] solder composition Fellow Technetters: In your experiences, at what point will one start to see differences in solubility in wave soldering. I monitor our solder composition and am starting to see my Tin deplete as time goes by. I'm not seeing any immediate defects, but am wondering what is the alarm point. None of the other contaminates are out of spec. I just notice my Tin composition depleting and the balance is the Pb. Any thoughts? I can give technical expectations from looking at the Eutectic, but am looking for the experience point of view. Jason Smith Lexmark Electronics Process Materials Engineer ################################################################ TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c ################################################################ To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TechNet <your full name> To unsubscribe: SIGNOFF TechNet ################################################################ Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section for additional information. For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312 ################################################################ ################################################################ TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c ################################################################ To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TechNet <your full name> To unsubscribe: SIGNOFF TechNet ################################################################ Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section for additional information. For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312 ################################################################