Mail*Link¨ SMTP Returned Mail -------------- Special condition follows -------------- Unknown QuickMail recipient(s): [log in to unmask] -------------- Message follows -------------- Received: by smtpgate.tcs.teradyne.com with SMTP;22 Aug 1995 09:29:29 -0500 Date: Tue, 22 Aug 95 09:30:16 0000 From: Lisa Greenleaf <[log in to unmask]> Organization: Teradyne Connection Systems X-Mailer: Mozilla 1.1N (Macintosh; I; 68K) MIME-Version: 1.0 To: [log in to unmask] Subject: (no subject) X-URL: http://www.automata.com/ipc/technet1/msg00118.html Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=us-ascii It has been our experience that nailheading is affected by copper type as well as drilling parameters and board stack up/design. Feeds and speeds are most common, however a board design with heavy copper layers surrounding thinner foils tend to be prone to nailheading. The dendrite activity is much more concentrated on HTE foil than on STD and although there is certainly differences in the physical properties of the two, many times what appears to be a nail head is really a dendrite. Regards, Lisa Greenleaf Teradyne Circuits Operations 603-880-9461 x118 [log in to unmask]