Pat, Most board shops remove unused pads to reduce the possibility of etch or imaging problems, especially with false AOI errors. I don't believe Class 3 addresses this. On some designs its better to leave the pads on if there's going to be excessive fill necessary. To Steve's point, I don't understand how a copper pad would prevent glass fiber tear-away. Sound more like his fab-house fixed a drilling problem. If there is a benefit to leaving them on, I'd like to know. Steve Telgen -----Original Message----- From: TechNet [mailto:[log in to unmask]]On Behalf Of Patrick Lam Sent: Friday, January 11, 2002 17:12 To: [log in to unmask] Subject: [TN] Remove unused "dead" pads on internal layers Hi TechNetters, For class 3 boards, is it acceptable to have unused pads removed on interanal layers. Thanks, Pat This e-mail may contain SEL confidential information. The opinions expressed are not necessarily those of SEL. Any unauthorized disclosure, distribution or other use is prohibited. If you received this e-mail in error, please notify the sender, permanently delete it, and destroy any printout. Thank you. ---------------------------------------------------------------------------- ----- Technet Mail List provided as a free service by IPC using LISTSERV 1.8d 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 delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL To recieve ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail 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 1.8d 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 delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL To recieve ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail 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 ---------------------------------------------------------------------------------