Thanks for the explanation... I have heard/seen water soluble oil being used in roller tinning, and it apparently worked well.. have never heard of salt being used until now. Rudy Sedlak Mike Fenner <[log in to unmask]> wrote: The salt controls dross on the pot and (sometimes forgotten) ensures the bottom roller remains tinned. The alternative to salt is vigilance and more dross. Possibly you could use a [so called] water soluble oil, but I have never seen this done, as these were introduced after roller tinning fell out of use in Europe. Roller tinning is an old process, but cheap. I think the nearest modern equivalent process, to think of as an alternative, would be Hot Air Solder Levelling. This would give much better or at least consistent solderability and not have the blips on the trailing edge of pads. Regards Mike Fenner Indium Corporation T: + 44 1908 580 400 M: + 44 7810 526 317 F: + 44 1908 580 411 E: [log in to unmask] W: www.indium.com Pb-free: www.Pb-Free.com -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Baski Devre Sent: 12 July 2006 16:39 To: [log in to unmask] Subject: [TN] Roller Tinning Process Dear Technetters As you know that some PCB manufacturer uses roller tinning soldering process. In this process firstly flux is spread over PCB and then passed through rollers to be soldered. In this solder alloy sometimes a bit salt is added to improve soldering quality and help solder to be appread bright. I want to learn that if there is any alternative material used in roller tinning soldering process to elaminate salt or is there any alternative roller tinning soldering process flow. Thanks in advance to your comments and knowledge share Best Regards -- Yusuf GÖMEÇ Product Quality Engineer BASKI DEVRE SAN ve TIC LTD STI Ceyhan Sk. 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