Hi Phil, That has usually has been my experience too, but there have been a few times that I've had the analysis come back low on tin. Couldn't explain exactly why other than previous to the low analysis we were generating a lot of dross because we had the turbulent wave on all the time because of the boards we were running. I was also told one time that using Kleenox when dedrossing the pot may contribute to low tin because you tended not to add as much virgin solder. Don't know how true that is, but it goes along with what you're saying... Yes, that would be good to know what kind of solder pot we're talking about. Steve -----Original Message----- From: [log in to unmask] [mailto:[log in to unmask]] Sent: Thursday, March 10, 2011 4:12 PM To: TechNet E-Mail Forum; Steve Gregory Subject: RE: [TN] Solder bath analysis. Sn63Pb37 alloy. My experience was always that the make-up addition of Sn63Pb37 bars was always enough to level out the bath analysis. I suppose we should ask whether the bath in question is a static tinning pot, wavesolder pot, or rework fountain. Phil -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory Sent: Thursday, March 10, 2011 12:58 PM To: [log in to unmask] Subject: Re: [TN] Solder bath analysis. Sn63Pb37 alloy. Hi Juan! Yep, the dross is mostly tin oxides. You will generate more, the more turbulent the wave is. The few times that I've had a pot get low on tin, I think it was because we were running a lot of boards with bottomside SMT and we had the turbulent wave on a lot. You are also right, just get some pure tin bars and add them in. Steve -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Juan T. Marugán Sent: Thursday, March 10, 2011 3:42 PM To: [log in to unmask] Subject: [TN] Solder bath analysis. Sn63Pb37 alloy. I have a question about the variation of the tin content in the solder alloy and I'm sure that somebody will explain it me. Why the tin content decrease more than 1% from the nominal of the Sn63Pb37 alloy? May it be by the dross...? I suppose that it will be neccesary to add pure tin. Is it correct? Thank you for your support. Kind regards. Juan Indra Sistemas SA Spain --------------------------------------------------- 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.aspx?Pageid=E-mail-Forums 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. 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