Good point, however, the solder joint I am concerned with is attaching a Kovar connector into an aluminum housing -- no FR4 is involved. Still the "new" solder compound being created could be a concern. Sheila @ TRACOR AES At 01:28 PM 10/23/97 -0400, you wrote: >Dave, Sheila, >Although soldering irons can certainly melt the 95/5 solder isn't there >an increased risk of damage to the board because of the application of >the higher temperature to the FR-4? >Bev Christian >Nortel >[log in to unmask] > >>---------- >>From: David D Hillman[SMTP:[log in to unmask]] >>Sent: Thursday, October 23, 1997 11:59 AM >>To: [log in to unmask] >>Subject: Re: [TN] [TECHNET] ASSY: Solder compatibility >> >>Hi Sheila - a question - do you know that the voids are detrimental to >>solder joint reliability? Also mixing of 95/5 with Sn62 is probably not >>going to give you an intermetallic issue but you will probably get a >>reeeaallly neat solder joint composition which will be very hard to predict >>any type of properities data or even a simple melting point. If you must do >>touchup why not use 95/5 as the touchup alloy? Soldering irons can melt >>that alloy. Good Luck. >> >>Dave Hillman >>Rockwell Collins >>[log in to unmask] >> >> >> >> >> >>[log in to unmask] on 10/21/97 10:05:36 AM >> >>Please respond to [log in to unmask]; Please respond to [log in to unmask] >> >>To: [log in to unmask] >>cc: (bcc: David D Hillman/CedarRapids/Collins/Rockwell) >>Subject: [TECHNET] ASSY: Solder compatibility >> >> >> >> >>Hello TechNet .. >>Does anyone have any experience with possible intermetallics formation if I >>use Sn62Pb362Ag to touchup voids in a Vapor phase reflowed Sn95Sb5 solder >>joint ??? Especially after 100 temp cycles from -55C to 120C? Thanks for >>any help! >>Sheila Smith, Tracor AES >>############################################################## >>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. >>For the technical support contact Dmitriy Sklyar at [log in to unmask] or >>847-509-9700 ext.311 >>############################################################## >> >>############################################################## >>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. >>For the technical support contact Dmitriy Sklyar at [log in to unmask] or >>847-509-9700 ext.311 >>############################################################## >> > >############################################################## >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. >For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311 >############################################################## > ############################################################## 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. For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311 ##############################################################