Subject: | |
From: | |
Reply To: | |
Date: | Wed, 5 Mar 2008 11:21:47 EST |
Content-Type: | text/plain |
Parts/Attachments: |
|
|
Dan and Brian
We have qualified clients who clean a no clean and have since the mid 90's
(Les Hymes was one of the first). But we have found that with a rescue cleaning
and only if you have water tolerant parts (if not those need to be removed)
that you can effectively clean a residue that was not designed to be cleaned.
These residues do need a good saponifier, low pressure inline (not able to
do in a standard batch system), heated to 140-150 F wash and rinse with DI
water at 10 meg ohm or better, but this is not enough by itself but we found
that if we use DI steam after wash and before rinse then we are able to clean
under low standoff components, BGA's, and with a little help QFN and PQFN
packages. We presented this information at the IPC Midwest Expo 2007, authored
by Eric Camden. We have successfully been rescue cleaning for the last 7
years no clean assemblies that were 6-12 months old. So it is very doable but
standard batch cleaning with a saponifier has not proven to us or our
customers who we have help implement this type of cleaning that batch or standard
inline cleaning is able to do the job.
Terry Munson
Foresite
765-457-8095
In a message dated 3/5/2008 10:53:25 A.M. Eastern Standard Time,
[log in to unmask] writes:
"Generally speaking I have not seen good results in trying to clean off
no-clean flux. They call it "no-clean" for a reason."
Agreed!!! Even if you succeed to do the job well - it can be done with
some fluxes - it will not be very easy and may be quite costly. I have
always said, if you clean, use a flux which was designed from the start
for easy cleaning.
¤0.02 worth
Brian
Dan Mauro wrote:
> Folks,
>
>
>
> I have a need to clean No-clean residue from PCBA's. Can this be
> achieved with water washer and some type of saponifier ? Can anybody
> suggest a batch process?
>
>
>
> Thanks,
>
> Dan
>
>
> ---------------------------------------------------
> Technet Mail List provided as a service by IPC using LISTSERV 15.0
> 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
847-615-7100 ext.2815
> -----------------------------------------------------
>
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0
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
847-615-7100 ext.2815
-----------------------------------------------------
**************It's Tax Time! Get tips, forms, and advice on AOL Money &
Finance. (http://money.aol.com/tax?NCID=aolprf00030000000001)
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0
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 847-615-7100 ext.2815
-----------------------------------------------------
|
|
|