All,
Or, if you paste the following link into your browser, you can pull it
down for free!
http://scholar.google.com/url?sa=U&q=http://www.smta.org/files/SMTAI01-C
hada.pdf
Steve
-----Original Message-----
From: Leadfree [mailto:[log in to unmask]] On Behalf Of Graeme Stewart
Sent: Tuesday, August 22, 2006 4:26 AM
To: [log in to unmask]
Subject: Re: [LF] Immersion Silver and Conductive Carbon Ink
I only have a hard copy of the paper, it was written for SMTA
International conference in Sept 2001 but you can get a copy at
http://www.smta.org/knowledge/proceedings_abstract.cfm?PROC_ID=790
They tested Imm Ag for keypad applications using a contact resistance
test. There conclusion was that for keypad applications in portable
products the finish was a viable alternative to ENIG with prolonged
exposure to a corrosive atmosphere being the exception.
Regards,
Graeme.
-----Original Message-----
From: Leadfree [mailto:[log in to unmask]] On Behalf Of John Burke
Sent: 18 August 2006 18:21
To: [log in to unmask]
Subject: Re: [LF] Immersion Silver and Conductive Carbon Ink
Oh OK,
I think though that they actually put the carbon ink on at the board
vendors, so the problem they are experiencing is the carbon
lifting/peeling/chipping off right Douglas?
John
-----Original Message-----
From: Leadfree [mailto:[log in to unmask]] On Behalf Of Creswick, Steven
Sent: Friday, August 18, 2006 10:10 AM
To: [log in to unmask]
Subject: Re: [LF] Immersion Silver and Conductive Carbon Ink
John,
I was thinking of 'cleaning' after the reflow process had been done, and
immediately before the carbon ink step. ... whatever the 'cleaning' step
might be. :-)
Steve
-----Original Message-----
From: John Burke [mailto:[log in to unmask]]
Sent: Friday, August 18, 2006 1:06 PM
To: '(Leadfree Electronics Assembly Forum)'; Creswick, Steven
Subject: RE: [LF] Immersion Silver and Conductive Carbon Ink
A word of warning, any attempt to "clean" a silver board in process to
make the carbon ink "stick" will probably render it useless by the time
it gets to being soldered at the assembly stage. There is indeed a
co-deposited material to prevent tarnish with most of those chemistries.
John
-----Original Message-----
From: Leadfree [mailto:[log in to unmask]] On Behalf Of Creswick, Steven
Sent: Friday, August 18, 2006 9:26 AM
To: [log in to unmask]
Subject: Re: [LF] Immersion Silver and Conductive Carbon Ink
Scott,
Along Lester's line of thought, are there preservatives / anti-tarnish
constituents, etc. still on the surface? Do they have the same problem
with virgin boards [before you reflow components on them, etc.]? Or is
it worse in the virgin state?
Can they argon plasma clean [as a test], or maybe a solvent wipe of some
nature ... Solvent as best suggested by potential platers out there.
Steve
-----Original Message-----
From: Leadfree [mailto:[log in to unmask]] On Behalf Of Lester Subrattee
Sent: Friday, August 18, 2006 11:07 AM
To: [log in to unmask]
Subject: Re: [LF] Immersion Silver and Conductive Carbon Ink
Hi Scott,
I don't have a solution for your problem except to say that
you're depositing on metal and should have no issues if it is clean.
Unless the silver is actually lifting off. I think it could be a surface
prep issue or contamination from either the PCB house or your fabricator
in handling.
Get
the surface analyzed and cleaned, then retry.
That being said, there have been studies by some OEMs that
indicate capability of Immersion Silver as a contactable surface in lieu
of gold.
That is one of the reasons Immersion Silver's popularity has increased.
Unfortunately, I don't have the details and reports but someone on the
Forum might.
Good Luck,
LS
-----Original Message-----
From: Douglas, Scott [mailto:[log in to unmask]]
Sent: Friday, August 18, 2006 10:41 AM
To: [log in to unmask]
Subject: Immersion Silver and Conductive Carbon Ink
Fellow list persons,
=20
I have a printed circuit board used in a remote control unit. We changed
the solder plating on the board to immersion silver for RoHS compliance.
Our fabricator is having a problem getting the conductive carbon ink to
stick to the immersion silver. Is anyone aware of this type of problem?
We are trying to figure out if we just have a vendor problem or is there
some issue with the immersion silver and conductive carbon ink
combination. Any suggestions as to changes or corrective actions?
=20
As always, thank you in advance for your comments.
Scott Douglas, NCE=20
Staff Technical Specialist
Harman Specialty Group=20
3 Oak Park Drive=20
Bedford, MA 01730=20
Phone: (781) 280-0406=20
Email: [log in to unmask]
Web: www.harmanspecialtygroup.com=20
------------------------------------------------------------------------
----
---Leadfee Mail List provided as a 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 Leadfree To temporarily
stop/(start) delivery of Leadree for vacation breaks
send:
SET Leadfree NOMAIL/(MAIL)
Search previous postings at: http://listserv.ipc.org/archives Please
visit IPC web site
http://www.ipc.org/contentpage.asp?Pageid=3D4.3.16
for additional information, or contact Keach Sasamori at [log in to unmask]
or 847-615-7100 ext.2815
------------------------------------------------------------------------
----
---
THIS EMAIL AND ANY ATTACHED FILES ARE CONFIDENTIAL AND MAY BE LEGALLY
PRIVILEGED. If you are not the addressee, any disclosure, reproduction,
copying, distribution or other dissemination or use of this
communication is strictly prohibited. If you have received this
transmission in error, please notify the sender immediately and delete
this email. It is the policy of ACR Electronics, Inc. that no legally
binding statements, representations or commitments (collectively
statements) may be made by email. Any such statements must be confirmed
either by facsimile transmission or by postal mail before they will have
legal effect. The sender of this email is not authorised to commit the
company in any way and the addressee is hereby notified of that fact.
------------------------------------------------------------------------
-------Leadfee Mail List provided as a 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 Leadfree To
temporarily stop/(start) delivery of Leadree for vacation breaks
send: SET Leadfree NOMAIL/(MAIL)
Search previous postings 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
------------------------------------------------------------------------
-------
THE INFORMATION CONTAINED IN THIS E-MAIL MESSAGE AND ANY ATTACHMENTS
SENT FROM GENTEX CORPORATION IS GENTEX CONFIDENTIAL INFORMATION INTENDED
ONLY FOR THE PERSONAL USE OF THE INDIVIDUAL OR ENTITY NAMED ABOVE. If
you are not the intended recipient, you are hereby notified that any
review, distribution, or copying of this communication is strictly
prohibited. If you have received this communication in error, please
immediately notify the sender by return e-mail, and delete this e-mail
message and any attachments from your computer.
------------------------------------------------------------------------
----
---Leadfee Mail List provided as a 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 Leadfree To temporarily
stop/(start) delivery of Leadree for vacation breaks
send:
SET Leadfree NOMAIL/(MAIL)
Search previous postings 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
------------------------------------------------------------------------
----
---
THE INFORMATION CONTAINED IN THIS E-MAIL MESSAGE AND ANY ATTACHMENTS
SENT FROM GENTEX CORPORATION IS GENTEX CONFIDENTIAL INFORMATION INTENDED
ONLY FOR THE PERSONAL USE OF THE INDIVIDUAL OR ENTITY NAMED ABOVE. If
you are not the intended recipient, you are hereby notified that any
review, distribution, or copying of this communication is strictly
prohibited. If you have received this communication in error, please
immediately notify the sender by return e-mail, and delete this e-mail
message and any attachments from your computer.
------------------------------------------------------------------------
----
---Leadfee Mail List provided as a 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 Leadfree To temporarily
stop/(start) delivery of Leadree for vacation breaks send:
SET Leadfree NOMAIL/(MAIL)
Search previous postings 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
------------------------------------------------------------------------
----
---
------------------------------------------------------------------------
-------Leadfee Mail List provided as a 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 Leadfree To
temporarily stop/(start) delivery of Leadree for vacation breaks send:
SET Leadfree NOMAIL/(MAIL) Search previous postings 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
------------------------------------------------------------------------
-------
------------------------------------------------------------------------
-------Leadfee Mail List provided as a 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 Leadfree
To temporarily stop/(start) delivery of Leadree for vacation breaks
send: SET Leadfree NOMAIL/(MAIL)
Search previous postings 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
------------------------------------------------------------------------
-------
THE INFORMATION CONTAINED IN THIS E-MAIL MESSAGE AND ANY ATTACHMENTS SENT FROM GENTEX CORPORATION IS GENTEX CONFIDENTIAL INFORMATION INTENDED ONLY FOR THE PERSONAL USE OF THE INDIVIDUAL OR ENTITY NAMED ABOVE. If you are not the intended recipient, you are hereby notified that any review, distribution, or copying of this communication is strictly prohibited. If you have received this communication in error, please immediately notify the sender by return e-mail, and delete this e-mail message and any attachments from your computer.
-------------------------------------------------------------------------------Leadfee Mail List provided as a 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 Leadfree
To temporarily stop/(start) delivery of Leadree for vacation breaks send: SET Leadfree NOMAIL/(MAIL)
Search previous postings 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
-------------------------------------------------------------------------------
|
