X400-Content-Type: |
P2-1988 ( 22 ) |
Old-Return-Path: |
|
Date: |
25 Apr 1996 14:14:18 -0500 |
X-Status: |
|
Precedence: |
list |
Resent-From: |
|
Conversion: |
Allowed |
Disclose-Recipients: |
Prohibited |
Resent-Sender: |
|
MIME-Version: |
1.0 |
Status: |
O |
Priority: |
normal |
X-Loop: |
|
X-Mailing-List: |
|
Content-Return: |
Allowed |
X400-MTS-Identifier: |
[/c=US/admd=MCI/prmd=Honeywell/; 04614317FCF0A0CC-HW-MTA-AZ] |
TO: |
|
Message-Id: |
<04614317FCF0A0CC*/c=US/admd=MCI/prmd=Honeywell/o=AZ-MTA/ou=MSMail/ou=CAS/s=Edwards/g=Ted/i=A/@MHS> |
Return-Path: |
<TechNet-request> |
X400-Originator: |
|
X400-Recipients: |
non-disclosure; |
From [log in to unmask] Wed May 1 09: |
33:29 1996 |
Received: |
by ipc.org (Smail3.1.28.1 #2)
id m0uCWT8-000095C; Thu, 25 Apr 96 14:12 CDT |
Resent-Message-ID: |
<"99vG92.0.7NC.jwyVn"@ipc> |
Subject: |
|
From: |
|
Alternate-Recipient: |
Allowed |
X400-Received: |
by /c=US/admd=MCI/prmd=Honeywell/; converted ( IA5-Text);
Relayed; 25 Apr 1996 14:14:18 -0500
by mta HW-MTA-AZ in /c=US/admd=MCI/prmd=Honeywell/; converted (
IA5-Text); Relayed; 25 Apr 1996 14:14:18 -0500 |
Original-Encoded-Information-Types: |
IA5-Text |
Content-Identifier: |
04614317FCF0A0CC |
Parts/Attachments: |
|
|
My experience is the "contamination with sulfur" usually comes from how you
stored the board, did you interleaf with sulfur free paper, what did you do
with the cardboard box, I believe upon investigation you will find part of
making paper products(check sulfite paper pulp for info.) gives them
inherent sulfur. Manko in Solders and Soldering in the 1964 edition says" A
word about sulfur is in order. This contaminant which has a detrimental
effect on wetting is reported to be dangerous at levels of 0.03%(in solder)"
In addition most sulfite have low solubility and once gotten are hard to
get rid of.
----------
From: [log in to unmask]
To: [log in to unmask]
Subject: Sulphur contamination
Date: Thursday, April 25, 1996 10:43AM
I am interested in finding out potential causes of contamination of PCB,s
with sulphur. What typical fabrication or assembly processes may introduce
this contaminant to the board. What are the long term potential effects of
sulphur contamination and are there any studies I could reference.
Any suggestions or papers would be appreciated.
|
|
|