Paul: What would the preheat be? Regards, Ramon > -----Original Message----- > From: Stolar, Paul W [SMTP:[log in to unmask]] > Sent: Thursday, August 28, 2003 9:28 AM > To: [log in to unmask] > Subject: Re: [TN] Cracking Ceramic SMT Capacitors > > Is your preheat correct. We eliminated our shorting/cracked caps by > improving our preheat process for Reflow. > > > > Paul Stolar > > Materials Engineer > > Houston Technology Center > > Baker Atlas > > 713-625-5376 > > 713-625-4949 (fax) > > -----Original Message----- > From: Bob Perkins [mailto:[log in to unmask]] > Sent: Wednesday, August 27, 2003 6:42 PM > To: [log in to unmask] > Subject: [TN] Cracking Ceramic SMT Capacitors > > > > Cracking Ceramic SMT Capacitors > > > > " Is anyone else seeing an increase in the number of cracked and shorting > ceramic chip capacitors? In our experience as a contract manufacturer we > have, in the past, seen the occasional instance of ceramic capacitors > cracking and shorting out. The cause of this problem is generally obvious, > as it is isolated to components situated in areas of the PCB that are > subject to flexing. > > > > Recently however we have seen more frequent instances of this problem; > very often in areas of the board that should not be experiencing any > appreciable flex. Our process has not changed and neither have our sources > of these components. Have chip capacitors themselves become more fragile?" > > > > > Rod Lafond > > Manager, Quality Assurance and Technical Training > > APEX-Micro Manufacturing Corporation > > [log in to unmask] <mailto:[log in to unmask]> > > > > > > --------------------------------------------------- > 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/contentpage.asp?Pageid=4.3.16 > 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/contentpage.asp?Pageid=4.3.16 > 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/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 -----------------------------------------------------