Yup! CR = Convection Reflow Soldering. Darn! I'm developing the local habit of using acronyms without explaning them! I can give you some chapter and verse on hole diameters and aspect ratios that are successful or not, if you want. I've had 24 mil diameter holes filled that are only 7 mils deep, and as small as 18 mils with a 4:1 aspect ratio. I think about 12 mils at this ratio is the lower limit (certainly with my fab shops), and 25 mils is about the upper limit if you want to maintain a reasonably flat finish. with larger diameters, the material tends to sag and you get dips on one side and bumps on the other. We had to experiment a bit with hole sizes outside of this range to see what was possible and what was not. Depending on the application, though, I have come to realise that the process is more trouble than it's worth most of the time. Peter Steve Gregory <[log in to unmask]> 15/11/2002 08:59 AM Sent by: TechNet <[log in to unmask]> Please respond to "TechNet E-Mail Forum."; Please respond to SteveZeva To: [log in to unmask] cc: (bcc: DUNCAN Peter/Asst Prin Engr/ST Aero/ST Group) Subject: Re: [TN] Conductive epoxy via filling... Hi Peter! I just want to ask a question about your statement below: It was also a compromise solution to filling all the holes with solder, which may have fallen out again during CR, What is CR? Convection reflow? -Steve- --------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8e To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/html/forum.htm for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ----------------------------------------------------- --------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8e To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/html/forum.htm for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 -----------------------------------------------------