You are correct.
So is he.
If stored CORRECTLY shelf life is 6-12 months. Many shops do not do it in
house so compared to something they do "in house" it may cost that
particular shop more to send it out. Normally Immersion Silver is less
costly than AU but as you can see that is circumstances dependent.

Also, if a shop does not have experience with Silver tarnish could be an
issue. It is important with Silver that EVERY process post application be
performed with attention to how the parts are handled. This includes the
proper slip sheets, packaging and most importantly never touching the silver
with bare fingers.

James Hofer
Director of Operations
Accurate Circuit Engineering
3019 S. Kilson Dr.
Santa Ana Ca. 92707-4202
714-546-2162 work
714-473-6127 cell
[log in to unmask]
----- Original Message -----
From: "Scott Lefebvre" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Wednesday, November 24, 2004 10:42 AM
Subject: [TN] Immersion Silver


I just got off the phone with one of our PCB FAB shops and was surprised on
his response to Immersion Silver as a solder finish.
He suggested that we do not use it as a replacement for HASL and to use gold
instead.  All the things I've read and did research on IAg in
contraction to he said.   The shop said shelf life is less than 6 months and
tarnish was a big issue.  It was more expensive than ENIG and not that many
shops do it in-house.

My understanding is the shelf life is 6-12 months if stored and handled
properly.  They silver used today has an anti-tarnishing agents to prevent
tarnishing.  I was also under the impression that IAg is less costly than
ENIG.

Your opinion in this matter would be greatly appreciated.

Thank you,

Scott

---------------------------------------------------
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
-----------------------------------------------------

---------------------------------------------------
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
-----------------------------------------------------