Just a few thoughts to add to the reply below: If the analysis shows low tin and if the lab is reputable then..... the sample has low tin. Question: How representative is your sample? No doubt your procedures for sampling specify that the pot is up to temperature and been pumping/waving for a specified time before taking the sample, that this is taken from the wave return and immediately chilled and so on. So if that is being done right and all your samples are representative, then the lab has highlighted that sometihing different is going on between your thee machines. Maybe you need to find out what it is, maybe you don't. Most people have a sufficient choice of walls on which to bang their heads already and I guess you are no different. I suggest your acion is to add the tin and make a note to keep half an eye on the trends you are plotting from the analysis reports. Good paractise here is to sample more frequently than you analyse, then if you get s sudden change you can back track in time to get a fix and hopefully relate that to some event. "passed by" sample can be used up in the wave, added to the dross bins or whatever. Finally: the addition of tin to solder pots is actually not an uncommon practise and fairly frequently recommended from lab analysis. Mike Fenner ----------------------------------------------------------- In a message dated 03/01/97 23:44:00, you write: << ubj: Re: ASSY: Low Tin Level in Wave Solder Date: 03/01/97 23:44:00 From: [log in to unmask] (Jerry Cupples) Resent-from: [log in to unmask] To: [log in to unmask] CC: [log in to unmask] Steve Gregory said: >We just got our solder analysis back (it's from a lab that everyone uses) >for our wave solder pots, and we have one wave solder pot that's low in Tin... (snipping for brevity) >...Looking at the tin content on the other >two pots, they're just barely above the limit which is 62.4%-63.6%...is my bar >solder vendor starting to get tight with the Tin? Any light that anybody can >shed on this would be 'preciated... >> *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To unsubscribe from this list at any time, send a message to: * * [log in to unmask] with <subject: unsubscribe> and no text. * *************************************************************************** * If you are having a problem with the IPC TechNet forum please contact * * Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask] * ***************************************************************************