Thank Phillip, I appreciate it. Does anyone else have any thoughts on this? I would like additional feedback if possible. Thank You in advance... -----Original Message----- From: TechNet [mailto:[log in to unmask]]On Behalf Of Phillip Bavaro Sent: Wednesday, September 21, 2005 4:02 PM To: [log in to unmask] Subject: Re: [TN] Lead Free pastes, wave solder, and core solders Hi Chris, I agree with Bev, but wanted to add that the wavesolder solder alloy has to deal with the variability of the percentages of it's components and the make up bar solder may be lacking the copper or silver constituent depending on the analysis of the pot and the finishes used on the product being put through it. Again this is half blind information and not based upon years of experience as no one is an expert in Pb free yet. Hope this helps Phil Chris Schaefer <[log in to unmask]> wrote: Hello all, I have a few question concerning the types of alloys used for pastes, wave solders, and core wire solders used in Lead Free processes. All of your help would be much appreciated... >>>>>>>>>>>>> I understand that SAC 305 is considered to be the industry standard and there has been much testing to indicate that it performs well in all of the mentioned processes stated above. Of course there are other solder compositions that are available to be used in these applications such as SAC 359, SAC 387, SAC 396, and SN100C. In terms of the testing of alternative compositions there is a measured amount of testing involved with them as well - some favoring better in some areas than others. The questions are: - Is SAC 305 truly the safest bet for soldering in these process arena's? - Must you use the same solder composition for the smt, wave solder, and core wire soldering area's? I understand that when one type is used in wave soldering and a different type used in the touch-up of the assemblies that the composition will change, but does that make a significant difference. Possibly in the realm of the Materials Declaration process it may perhaps???? Don't know... - Are there in your opinions better alloys than SAC 305 no matter the cost? - Are any of you using other allow compositions (non SAC 305) in smt, wave solder, and core solders? If so what drove you to use other compositions? Costs, larger process windows, better joint cohesion, etc... And what are you thoughts on using them? - I heard in these rooms and others that the more silver content in the composition the better in terms of solderability. Is this true in the Pb Free arena as well? >>>>>>>>>>>>> We are currently in the process of setting up a Pb Free process for these core processes and I am not completely convinced that SAC 305 is the right choice for wave solder, it may be a good choice, but is it the absolute best choice. Especially knowing that new allows are coming out all of the time and possibly better ones for the stated processes. I don't claim to be anything close to an expert in terms of Pb Free soldering or even metallurgy compositions, but I certainly would like to know that whatever choice is made - it is the best choice for us right now. I would appreciate your help in this matter. You help is much appreciated as always. Thank You. Chris Schaefer Suntron Corporation Process Engineer 540 N. 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