It would be worth having your pcb supplier measure the plating thickness, too thin and you see soldering problems. Best Regards ian >From: Francis Lai <[log in to unmask]> >Reply-To: "TechNet E-Mail Forum." <[log in to unmask]>, Francis Lai ><[log in to unmask]> >To: [log in to unmask] >Subject: Re: [TN] Sloder bubbles on the VIAs >Date: Wed, 14 Jul 1999 21:49:08 -0700 >MIME-Version: 1.0 >From [log in to unmask] Fri Jul 16 08:27:09 1999 >Received: from [209.42.15.76] by hotmail.com (2.0) with ESMTP id >MHotMailB9589A47003DD82197E2D12A0F4CC50C0; Fri Jul 16 08:27:09 1999 >Received: from jefry ([209.42.15.79])by mail.ipc.org (8.8.8+Sun/8.8.8) with >ESMTP id JAA12587;Fri, 16 Jul 1999 09:54:31 -0500 (CDT) >Received: from IPC.ORG by IPC.ORG (LISTSERV-TCP/IP release 1.8d) with spool >id 2020189 for [log in to unmask]; Wed, 14 Jul 1999 20:38:29 -0500 >Received: from mail.ipc.org (209.42.15.76:39570) by IPC.ORG (LSMTP for >Windows NT v1.1b) with SMTP id <[log in to unmask]>; Wed, 14 Jul >1999 20:38:29 -0500 >Received: from freenet.carleton.ca (freenet1.carleton.ca [134.117.136.20]) >by mail.ipc.org (8.8.8+Sun/8.8.8) with ESMTP id UAA16725 for > <[log in to unmask]>; Wed, 14 Jul 1999 20:47:33 -0500 (CDT) >Received: from freenet.carleton.ca (p13t3.std.dialup.ncf.carleton.ca > [134.117.137.172]) by freenet.carleton.ca (8.9.1a/8.9.1/NCF_f1_v3.00) > with ESMTP id VAA09878; Wed, 14 Jul 1999 21:46:54 -0400 (EDT) >X-Mailer: Mozilla 4.61 [en] (Win95; I) >X-Accept-Language: en >References: ><[log in to unmask]> >Message-ID: <[log in to unmask]> >Sender: TechNet <[log in to unmask]> >X-To: "Tempea, Ioan" <[log in to unmask]> > >"Tempea, Ioan" wrote: > > > Hi, > > > > now that the problem with the blistering solder mask is fixed ( we sent >the > > boards back since backing them was of no use), I have another one. > > > > Some of our assemblies have a high density of VIAs. On these products, > > pretty often we get after wave some solder bubbles over the VIAs, some >of > > them exploded, like degassing. Since on some we see the same bubbling >even > > on the fiducials, I wonder if the humidity is the only one to blame, I >even > > wonder if there's any issue related to humidity at all. > > > > So, what could it be? Incompatibility between flux and solder sounds > > possible? > > > > I would appreciate any input, > > > > Ioan > >Dear Ioan : > >To me it sounds like copper plating problem. The surface of the base copper >probably was not cleaned enough, it caused blisters. I think if you do a >tape >test after copper plating, probably, copper plated will peel. > >Please correct me if I am wrong!!! > >Francis > >############################################################## >TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c >############################################################## >To subscribe/unsubscribe, send a message to [log in to unmask] with following >text in >the body: >To subscribe: SUBSCRIBE TECHNET <your full name> >To unsubscribe: SIGNOFF TECHNET >############################################################## >Please visit IPC web site (http://www.ipc.org/html/forum.htm) for >additional >information. >If you need assistance - contact Gayatri Sardeshpande at [log in to unmask] or >847-509-9700 ext.5365 >############################################################## ______________________________________________________ Get Your Private, Free Email at http://www.hotmail.com ############################################################## TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c ############################################################## To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TECHNET <your full name> To unsubscribe: SIGNOFF TECHNET ############################################################## Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information. If you need assistance - contact Gayatri Sardeshpande at [log in to unmask] or 847-509-9700 ext.5365 ##############################################################