It is classified as H0, doesn't that rule out chloride activators?
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Brian Ellis
Sent: Wednesday, October 24, 2007 2:51 AM
To: [log in to unmask]
Subject: Re: [TN] cleaning concerns
If WS609 is what I think it is, the best answer is 30 minutes max. I believe
this flux is an amine-hydrochloride activated product and the residues may
contain hydrochloric acid which is highly ionic and corrosive. I think it
will also contain some surfactant which, almost by definition, is
hygroscopic. You therefore have all the makings of a catastrophe in an
uncleaned state. The ideal would be to start the wash process when it had
cooled to the same temperature as your prewash, about 50°C.
In days of old, when knights were bold, and SMT wasn't invented,
MIL-P-28809 recommended cleaning should start within 1 hour of soldering and
that was with approved non-corrosive RMA fluxes to MIL-F-13949 (I think).
The UK DEF-Spec, which allowed the use of WS fluxes for military
applications, it was stated to the effect that cleaning should start as
soon as possible after soldering.
Brian
Linda Langley wrote:
>
> Can anyone tell me or direct me to documentation that specify how long
flux residue from WS609 63/37 can be left on a board before washing?
>
> I was informed that it could be left on for 7 days .
>
> Linda Langley
> Jabil Circuit
> Training Specialist
> (248) 292-6176
>
> CONFIDENTIALITY NOTICE: The information contained in this electronic
> communication, including any attachments, is confidential information,
> is intended only for the use of the recipients named above, and may be
> legally privileged. If the reader of this message is not an intended
> recipient, you are hereby notified that any review, use,
> dissemination, distribution or copying of this communication, or any
> of its contents, is strictly prohibited. If you have received this
> communication in error, please notify us immediately of the error by
> return e-mail and please permanently remove the original message and
> any copy of it from your system. Nothing herein is intended to
> constitute an electronic signature or consent. Thank you
>
>
> ---------------------------------------------------
> 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
-----------------------------------------------------
---------------------------------------------------
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
-----------------------------------------------------
|
