Search the TechNet archives. Thieving comes up quite a bit. I'd say the consensus is that thieving on inner layers is important to help bonding. Some also claim it can help reduce warpage. On outer layers it's to achieve more uniform plating. http://listserv.ipc.org/archives/technet.html Bob S. -----Original Message----- From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On Behalf Of Lee Ritchey Sent: Tuesday, February 28, 2006 10:08 AM To: Charles Grasso; Gerry Gagnon; rhaller@xxxxxxxxxxxxx Cc: si-list@xxxxxxxxxxxxx Subject: [SI-LIST] Re: Ground Pour in Signal Layers Might want to check with the process engineers at Merix or TTM on this one. > [Original Message] > From: Grasso, Charles <Charles.Grasso@xxxxxxxxxxxx> > To: <leeritchey@xxxxxxxxxxxxx>; Gerry Gagnon <mrgagman@xxxxxxxxxxx>; <rhaller@xxxxxxxxxxxxx> > Cc: <si-list@xxxxxxxxxxxxx> > Date: 2/28/2006 9:34:58 AM > Subject: RE: [SI-LIST] Re: Ground Pour in Signal Layers > > How interesting! I have not had to deal with thieving on inner layers > so I popped down to our layout group and asked our folks there. The > consensus was - YES - Thieving on inner layers can be necessary and > should be used for unbalanced layouts. Indeed one former employee of > DDI indicated that DDI had a program that automatically added thieving > based on the design. The reason for adding the thieving is to avoid > warpage. > > > Best Regards > Charles Grasso > Senior Compliance Engineer > Echostar Communications Corp. > Tel: 303-706-5467 > Fax: 303-799-6222 > Cell: 303-204-2974 > Pager/Short Message: 3032042974@xxxxxxxx > Email: charles.grasso@xxxxxxxxxxxx; > Email Alternate: chasgrasso@xxxxxxxx > ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List FAQ wiki page is located at: http://si-list.org/wiki/wiki.pl?Si-List_FAQ List technical documents are available at: http://www.si-list.org List archives are viewable at: //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu