I am a printed circuit board designer and I will tell you that quite often when I am speaking to a fabricator and I need to take the vias way down say 8 mils or below the first thing I hear from the fabricator is "Is it okay if the vias are plated shut" -----Original Message----- From: TechNet [mailto:[log in to unmask]]On Behalf Of David Greig Sent: Thursday, April 26, 2007 8:39 AM To: [log in to unmask] Subject: [TN] "plated shut vias" Hi List, Yet again I've come across fabrication notes on other pcb designers notes that specify that thru board via's may be plated shut. Is there any historical reason for this, or is it just hysterical? I would be rather concerned to see a closed via that is neither blind or filled, mental images of trapped process chemistry etc. Best Regards David Greig ______________________________ GigaDyne Ltd 5 Albany Business Centre Gardeners Street Dunfermline KY12 0RN United Kingdom t: +44 (0)1383 624 975 www.gigadyne.co.uk ______________________________ --------------------------------------------------- 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 -----------------------------------------------------