Received: |
by ipc.org (Smail3.1.28.1 #2)
id m0w34Gd-000BD3C; Fri, 7 Mar 97 12:21 CST |
Content-Type: |
text/plain; charset="us-ascii" |
Old-Return-Path: |
|
Date: |
Fri, 7 Mar 1997 10:29:46 -0800 |
Precedence: |
list |
Resent-From: |
|
From [log in to unmask] Mon Mar 10 08: |
27:37 1997 |
Resent-Sender: |
|
MIME-Version: |
1.0 |
Status: |
O |
X-Mailing-List: |
|
TO: |
|
Return-Path: |
<TechNet-request> |
X-Status: |
|
Resent-Message-ID: |
<"JJAVd1.0.qwM.Uo58p"@ipc> |
Subject: |
|
From: |
|
X-Loop: |
|
Content-Transfer-Encoding: |
7bit |
X-Mailer: |
Microsoft Exchange Server Internet Mail Connector Version 4.0.994.63 |
Message-ID: |
|
Parts/Attachments: |
|
|
===============================
Jim Maguire
Senior Principal Engineer
Boeing Defense & Space Group
(206)657-9063 fax 657-8903
Email: [log in to unmask]
================================
>----------
>From: Chang, Willy
>Sent: Friday, March 07, 1997 10:13 AM
>To: Maguire, James F
>Subject: RE: Conformal coating
>
>Our experience at Boeing reaffirms that the conformal coating material will
>wick onto pins of unsealed connector. Nevertheless I would still recommend
>coating metal surfaces especially if it is going to be exposed to humidity
>and salt/fog testing. Albeit conformal coating is not a hermetic seal but
>our testing shows it does make a noticeable difference.
>
>We occasionally encounter designs that uses unsealed connectors. In those
>incidences, we pot/seal the backs of the connector (e.g., polysulfide, etc.)
>prior to coating which prevents wicking very effectively. Of course the
>"mouth" of the connector is sealed w/liquid maskant and adhesive tape. We
>have also found wicking is much less of a problem when using spray as oppose
>to immersion application.
>
>
>
>================
>Willy Chang
>Electronics M&P
>Org. 9-5572
>657-9194
>
>----------
>From: Sheila Smith[SMTP:[log in to unmask]]
>Sent: Friday, March 07, 1997 5:16 AM
>To: [log in to unmask]
>Subject: FAB: Conformal coating
>
>Technetters:
>
>I am soliciting opinions on conformal coating of PBW-mounted connectors.
>Our manufacturing folks refuse to conformal coat within 1/8" of any board
>mount connectors. They contend the conformal coating will wick up the pins
>and get on the contact areas, regardless of the type of conformal coating
>used or the method of application. The connectors are not sealed. These
>boards have to pass salt fog & humidity testing and I don't like the idea of
>having bare areas, especially at the interface where the connector meets the
>board. Does anyone have any experience with this? Thanks in advance for
>your help!
>
>S. Smith, Tracor Aerospace Electronics Systems
>
>***************************************************************************
>* TechNet mail list is provided as a service by IPC using SmartList v3.05 *
>***************************************************************************
>* To subscribe/unsubscribe send a message <to: [log in to unmask]> *
>* with <subject: subscribe/unsubscribe> and no text in the body. *
>***************************************************************************
>* If you are having a problem with the IPC TechNet forum please contact *
>* Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask] *
>***************************************************************************
>
>
>
>
***************************************************************************
* TechNet mail list is provided as a service by IPC using SmartList v3.05 *
***************************************************************************
* To subscribe/unsubscribe send a message <to: [log in to unmask]> *
* with <subject: subscribe/unsubscribe> and no text in the body. *
***************************************************************************
* If you are having a problem with the IPC TechNet forum please contact *
* Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask] *
***************************************************************************
|
|
|