as Steve Gregory kindly pointed out off-line, those "deg C" should read "deg F"....how embarrassing since I pointed out on this very forum the importance of using correct units, a la NASA.. Darn spelling checker doesn't catch incorrect physical constants! > ---------- > From: Timothy Reeves > Sent: Friday, October 15, 1999 5:08 PM > Subject: Re: Tin content of HASL > > Jack, > I'd be surprised if your board supplier was really paying attention to > that.. I mean does anyone have a HASL machine set up with Sn70 solder? You > probably got Sn63..the standard HASL solder. > Also, the liquidus for Sn70 is only 378 deg C (vs. 361 deg C for Sn63). It > doesn't seem like that would stay solid in your selective soldering > process > without very tight temp. control. > Tim Reeves > > > ---------- > > From: Jack Olson > > Sent: Thursday, October 14, 1999 5:34 PM > > Subject: Tin content of HASL > > > > I've just noticed that our fab notes call for 70% Tin 30% Lead on Hot > Air Solder Level. > > This only struck me as odd because at a previous company we used SN70 as > a > > high temperature solder (I think) for terminal posts, so it wouldn't > reflow > > when we soldered wires to it using SN60 or SN63. > > Is it more appropriate to use SN60 or SN63 for HASL? > > Is there some advantage to using SN70? > > (Sorry for the cross-posts, but this affects FAB and ASSY as well as > DESIGN) > > > > Thanks in advance, Jack > ############################################################## TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c ############################################################## To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TECHNET <your full name> To unsubscribe: SIGNOFF TECHNET ############################################################## Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information. If you need assistance - contact Gayatri Sardeshpande at [log in to unmask] or 847-509-9700 ext.5365 ##############################################################