TECHNET Archives

January 2004

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:
Lee Whiteman <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Tue, 13 Jan 2004 16:19:22 -0500
Content-Type:
text/plain
Parts/Attachments:
text/plain (72 lines)
Steve Gregory,

Never saw that happen. My only thought would be that the solder mask was
not cured sufficiently or not applied properly.

Had a close call like that once. In developing a semi-aqueous cleaning
process, saw conformal coating removed with a semi-aqueous cleaning
solution at ambient temperature. The conformal coating was properly
mixed and applied. Found out that the chemistry eats urethanes from the
manufacturer at specific temperatures and concentration. Contact me off
line for details.

Hope this helps.

Good Luck

Lee Whiteman

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory
Sent: Tuesday, January 13, 2004 4:01 PM
To: [log in to unmask]
Subject: [TN] "Snake Board"...


Hi All!

You're probably wondering; "What the heck? Snake board?" That's what I
call it.

Built this assembly (all PTH), waved it, and then washed it, went to get
it out of our cleaner, and all the solder mask is coming off in big
slabs just like a snake does when he sheds his skin! Go look at "Mask
Peel, Mask Peel 2, & Mask Peel 3" at:

http://www.stevezeva.homestead.com

I wash in a Electrovert MCS-1000 with Kyzen XJN, and the mask on the
board was a Dupont Vacrel dry film. Never have had a problem with Vacrel
dry films.

The mask doesn't look degraded, or damaged in any way...it's just not
stuck to the board! Anybody ever seen this happen before? Unfortunately,
this was a rather expensive assembly.....:^{

Nice way to start the year off, huh?

-Steve Gregory-

---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 1.8e 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 or
(re-start) delivery of Technet send e-mail to [log in to unmask]: SET
Technet NOMAIL or (MAIL) 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/contentpage.asp?Pageid=4.3.16 for
additional information, or contact Keach Sasamori at [log in to unmask] or
847-509-9700 ext.5315
-----------------------------------------------------

---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 1.8e
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 or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL)
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/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315
-----------------------------------------------------

ATOM RSS1 RSS2