Thanks a lot Richard. Funny thing, but I had had the first two links opened in my computer already :-). What I don't understand is that none of the references show the type of cracking I'm dealing with. It's like someone "sliced" the caps along (not perpendicular!) to the body either parallel or perpendicular to the board. And if the former can be potentially explained by a CTE mismatched, then the latter doesn't fall in any categories. Regards, Vladimir -----Original Message----- From: Stadem, Richard D. [mailto:[log in to unmask]] Sent: Monday, July 14, 2008 2:39 PM To: TechNet E-Mail Forum; Igoshev, Vladimir Subject: RE: [TN] Ceramic caps Vladimir Here are potential causes of MLCCC cracking, and how to tell what caused the crack based on the crack's position, run direction, etc. http://www.ami.ac.uk/courses/topics/0179_fmcc/index.html#3 http://www.syfer.com/category_docs/AN0005_Mechanical_Cracking.pdf And an authorative paper on the subject by John Maxwell, who I think knows more about root causes of cap cracking than anyone: http://www.avx.co.il/docs/techinfo/cracks.pdf And a potential solution to the problem: http://www.avx.co.il/docs/techinfo/mlccflex.pdf Qualify it first. -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Igoshev, Vladimir Sent: Monday, July 14, 2008 1:13 PM To: [log in to unmask] Subject: Re: [TN] Ceramic caps Well, in the case I was asking about none of the failures were in that direction (across the body) but always along it splitting both ends in half either vertically or horizontally. Still a puzzle to me :-) Regards, Vladimir -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Ken Bloomquist Sent: Monday, July 14, 2008 2:05 PM To: [log in to unmask] Subject: Re: [TN] Ceramic caps Right! KennyB -----Original Message----- From: Igoshev, Vladimir [mailto:[log in to unmask]] Sent: Monday, July 14, 2008 10:48 AM To: TechNet E-Mail Forum; Ken Bloomquist Subject: RE: [TN] Ceramic caps So they were cracking normal to, not along the body of the caps. Right? Regards, Vladimir --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 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 847-615-7100 ext.2815 ----------------------------------------------------- --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 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 847-615-7100 ext.2815 ----------------------------------------------------- --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 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 847-615-7100 ext.2815 -----------------------------------------------------