Rudy and others,
The copper mirror test is a simple look-and-see test that can be used as
part of the qualification of a flux, solder paste, or any other chemical
that may come in contact with a printed circuit board or printed circuit
pack. See IPC-TM-650, Test Method 2.3.32D. Essentially a flux or
material is dissolved in IPA (or at least sort of), applied to a vapour
deposited copper mirror, the solvent is allowed to evaporate and then
the mirror is stored at RT and 50%RH for 24 hours and then you wash off
the material and see whether it has eaten through the thin copper mirror
coating.
Now if you are using water as the solvent, the vapour pressure is much
lower. I can't remember what I used to do when I did this test at
Nortel in the late 90's when we started to use the water-based wave
solder fluxes.
Bev
RIM
_____
From: R Sedlak [mailto:[log in to unmask]]
Sent: August 17, 2005 3:41 PM
To: TechNet E-Mail Forum; Bev Christian
Subject: Re: [TN] Copper Mirror test for water-based fluxes
For those of us who only recently realized that something had to happen
to a PCB before it was installed..(Assembly? What's that?)... be so
kind as to tell us more about this test, and what it is supposed to tell
you... and how to read it....
Any help is appreciated...(and needed)
Rudy Sedlak
RD Chemical Company
Bev Christian <[log in to unmask]> wrote:
It is such a long time that I have done one of these, that I
don't
remember what we did to evaporate the water! The alcohol based
ones are
easy, but the water ones?! Do you just let them set at room
temperature
or do you give them a little heat or what?
Bev
RIM
---------------------------------------------------------------------
This transmission (including any attachments) may contain
confidential information, privileged material (including material
protected by the solicitor-client or other applicable privileges), or
constitute non-public information. Any use of this information by anyone
other than the intended recipient is prohibited. If you have received
this transmission in error, please immediately reply to the sender and
delete this information from your system. Use, dissemination,
distribution, or reproduction of this transmission by unintended
recipients is not authorized and may be unlawful.
---------------------------------------------------
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 847-615-7100
ext.2815
-----------------------------------------------------
__________________________________________________
Do You Yahoo!?
Tired of spam? Yahoo! Mail has the best spam protection around
http://mail.yahoo.com
---------------------------------------------------------------------
This transmission (including any attachments) may contain confidential information, privileged material (including material protected by the solicitor-client or other applicable privileges), or constitute non-public information. Any use of this information by anyone other than the intended recipient is prohibited. If you have received this transmission in error, please immediately reply to the sender and delete this information from your system. Use, dissemination, distribution, or reproduction of this transmission by unintended recipients is not authorized and may be unlawful.
---------------------------------------------------
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 847-615-7100 ext.2815
-----------------------------------------------------
|
