Received: |
by ipc.org (Smail3.1.28.1 #2)
id m0vFRO4-0000QPC; Mon, 21 Oct 96 15:55 CDT |
Old-Return-Path: |
|
Date: |
Mon, 21 Oct 96 13:18:22 PST |
Precedence: |
list |
Resent-From: |
|
Cc: |
|
X-Status: |
|
Status: |
O |
X-Mailing-List: |
|
From [log in to unmask] Wed Oct 23 15: |
05:44 1996 |
TO: |
|
Return-Path: |
<TechNet-request> |
Resent-Message-ID: |
<"h03ef.0.oLN.LD-Qo"@ipc> |
Subject: |
|
From: |
|
Resent-Sender: |
|
X-Loop: |
|
Message-Id: |
|
Parts/Attachments: |
|
|
Typically BURNT copper would NOT be acceptable due to the fact that
tensile strength, elongation, and ductility will be severly
comprimised.
Regards,
Alan B. Cochrane
Multek Inc.
______________________________ Reply Separator _________________________________
Subject: FAB, ASSY: "Copper Burning" during plating
Author: [log in to unmask] at INTERNET_GATEWAY
Date: 10/21/96 10:54 AM
This morning, I was looking at some boards that had pads covered with
copper bumps, blisters, pimples, or whatever you want to call them. I've
been told this was a product of copper "burning", resulting when boards
are plated with current too high. Is this burnt copper unacceptable? I
didn't see any pictures in IPC-A-600 to suggest it wasn't, but don't like
the looks of the plating. Any comments? Thoughts from assemblers would
be welcome, too.
Lou Hart
Compunetics Quality Assurance
412-858-6117
.
***************************************************************************
* TechNet mail list is provided as a service by IPC using SmartList v3.05 *
***************************************************************************
* To unsubscribe from this list at any time, send a message to: *
* [log in to unmask] with <subject: unsubscribe> and no text. *
***************************************************************************
***************************************************************************
* TechNet mail list is provided as a service by IPC using SmartList v3.05 *
***************************************************************************
* To unsubscribe from this list at any time, send a message to: *
* [log in to unmask] with <subject: unsubscribe> and no text. *
***************************************************************************
|
|
|