Hi Kathy: Essentially, the entire back of the PCB is solid gold plating. There are only 2 small .060"x.060" I/O pads that are on the reverse of the board near some side edges. These I/O pads have 1/2 vias (plated) going up to the top of the board where identical I/O pads exist making contact with the top components. There are various ground vias around the board. Of course, the I/O pads are isolated from the ground pad(s) by bare FR-4. I don't have any pics, but if you go to this link (Spectrum Control, Inc. Wireless/RF filters), I think you will get the idea.. http://www.spectrumcontrol.com/pdfs/wcpg62-64.pdf Page 3, configurations "A"~"D". Each one is essentially the same. Some of our other non-standard boards have full vias in various places linking the top and bottom ground pads. One idea is to simply put solder mask around just about every 1/2 or full thru plated via. Tnx Matthew Steger Product Design Engineer RF/Microwave Products Spectrum Control, Inc. Phone: 717-361-4842 Fax: 717-361-4756 Email: [log in to unmask] Mailing Address: 1595 S. Mt Joy St., Elizabethtown, PA 17022 -----Original Message----- From: Kathy Kuhlow [mailto:[log in to unmask]] Sent: Thursday, May 03, 2001 2:31 PM To: [log in to unmask] Subject: Re: [TN] IPC standard for solder content on the back of PCBs? Can you put a photo out of the pad layout with the via connect? That may help in determining any suggestions. TIA Kathy --------------------------------------------------------------------------------- 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 the following message: SET Technet NOMAIL 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 ---------------------------------------------------------------------------------