Following from the EMPF Helpline, prepared by our metallurgist John Greaves: Increasing the Sn content will lower the liquidus and solidus, and once the Sn content increases beyond a point (I am not sure what that point is) a low melting binary eutectic phase will form ( eutectic SnPb, melts at 183°C). The person to ask about this is Carol Handwerker at NIST. Her phone is 301-975-6158, and her email is : [log in to unmask] If she can't help you then your answer doesn't currently exist. Hope this helps, John Greaves ---------- >From: [log in to unmask] >Date: Wed, 5 Feb 1997 07:08:08 -0600 >To: <[log in to unmask]> >Subject: ASY: Alloy contamination > > >Here's one for the metallurgist. I have been unable to locate a >Pb93.5/Sn5/Ag1.5 (305C liquidus; 309C solidus) ternary phase diagram >to date. I have been told that one of the technical issues is simply >soldering to SnPb plated and/or SnPb hot-dipped coated components with >this PbSnAg solder will realize a drop in the melting point. My >question is how much ? Assuming, for instance a lead finish >composition of Sn63/Pb37 with solder coat thickness of 3 to 4 mils or >a CERDIP package with leads that are 100% Sn electroplated (200 to >500micons). ***ALL NEW EMPF PHONE NUMBERS*** Jack Crawford, HelpLine Coordinator Electronics Mfg. Productivity Facility ****NEW--317.655.3688 ****FAX 317-655-3699 714 N Senate Ave, Suite 100 Indianapolis IN 46202-3112 VISIT OUR HOME PAGE AT: http://www.empf.org [log in to unmask] *************************************************************************** * 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] * ***************************************************************************