TECHNET Archives

May 2002

TechNet@IPC.ORG

Options: Use Monospaced Font
Show Text Part by Default
Show All Mail Headers

Message: [<< First] [< Prev] [Next >] [Last >>]
Topic: [<< First] [< Prev] [Next >] [Last >>]
Author: [<< First] [< Prev] [Next >] [Last >>]

Print Reply
Subject:
From:
Eric Dawson <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Tue, 28 May 2002 13:33:55 +0100
Content-Type:
text/plain
Parts/Attachments:
text/plain (47 lines)
Daan,
If you have a spare board, try applying a spot of high temperature oil to a
bga pad with a via and heat it to soldering temperature. Any outgassing of
the via should be visually obvious.
( I am speaking here from theory, not practise, but it should work).
Regards
Eric Dawson

> -----Original Message-----
> From: d. terstegge [SMTP:[log in to unmask]]
> Sent: Tuesday, May 28, 2002 11:37 AM
> To:   [log in to unmask]
> Subject:      [TN] Anti-voiding solder paste
>
> Dear Technetters,
>
> I'm having some problems with really big voids (up to 50% of the diameter)
> in the solderjoints of BGA's. The problems occur on our only board that
> has via's in the BGA-pads. The via's are filled and plated, so from the
> outside you don't see they're there.
> I'm quite sure that it's the board that's causing the problems, but the
> boardvendor does not agree and thinks our solderpaste is causing it.
> To prove that I'm right  (or to solve the problem if the boardvendor is
> right !) I'd like to do some tests with a solderpaste that's known to
> cause a minimal amount of voiding. From earlier discussions I learned that
> such solderpastes exist.
> Does anyone have a recommendation for such a solderpaste ?
>
> Daan Terstegge
> SMT Centre
> Thales Communications
> Unclassified mail
> Personal Website: http://www.smtinfo.net
>
>

---------------------------------------------------------------------------------
Technet Mail List provided as a free service by IPC using LISTSERV 1.8d
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/html/forum.htm for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315
---------------------------------------------------------------------------------

ATOM RSS1 RSS2