Hi Dan,

How have you been. I have also seen an increase in pink ring. My research has indicated that the most significant changes has been in the designs provided. I have seen an increase in designs that no longer use a thermal pad on the innerlayers. via holes are being drilled directly thru solid ground planes. I have been advised that the change is related to capacitance issue.

Even with the oxide reducers, I do not believe the actual "pink ring" phenomenon was every really eliminated. Just reducted to the point that it was no longer apparent from the outerlayers. The small amount a pink ring that was still present was hidden by the outerlayer pads. The use of thermal pads still  "limited"  the amount of "growth".   In any case. that is my opinion based on what I have seen. I'm sure you will receive other thoughts.

Ed Cosper
Director Quality Assurance and Engineering
Graphic Electronics.

----------
From:   [log in to unmask]
Sent:   Friday, August 07, 1998 6:29 PM
To:     [log in to unmask]
Subject:        [TN] IPCchat session announcement

************************************************************************
*    This message was originated by automatic IPC Chat Session
*    Request Page (http://jefry.ipc.org/IPCchat/IPCchat_request.html)
************************************************************************

Dan Pedroza ([log in to unmask]) announces a Chat session with topic
"Pink Ring Question".
The Chat session will be held on 08/07/98, at 2:10 P.M. pdt
 (Please note the time zone - it might be different from yours)

Dan Pedroza's comments:
We have just installed 2 new machines
and rearranged our existing machines.
We have just recently experienced pink ring
with no prior history.  If we did not ground all
machines would it start this phenomenon?

Has anybody else experienced this type of
problem?

*** IPC Chat Room rules and recommendations ***

- IPC Chat Room can be accessed at http://jefry.ipc.org/IPCchat/IPCchat.html or
  through the "IPC On-Line Services" link from IPC's homepage at http://www.ipc.org.
- You can announce your chat session using the form on the IPC Chat Page
under the link "Announce your own chat session".
- For time conversion use the link on the IPC Chat Page or visit
  http://poisson.ecse.rpi.edu/cgi-bin/tzconvert
- Please remember: this service is not for private use; topics of conversation
  should be kept relevant to the electronic interconnection industry. Also,
  since IPC Chat is open to everyone, please be aware that any information you
  provide about yourself will be available to every forum's participant.

If you have any questions or suggestions please contact Dmitriy Sklyar at
[log in to unmask] (tel: 874-509-9700 ext. 311).

################################################################
TechNet E-Mail Forum 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's web site (http://www.ipc.org) "On-Line Services" section for additional information.
For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312
################################################################