Of all the non HASL surface finishes ENIG is the most durable and has the
longest shelf life.
ENIG will survive standard storage conditions (exposed to ambient air) for
periods exceeding 12 months.
The same cannot be said about silver or tin.
Immersion silver will require resealing (not necessarily vacuum and all)
wrapping the boards in saram wrap to minimize prolonged exposure to sulfur
bearing air is all that is needed.
Immersion Tin has intermetallic issues that are formed over time sealed or
not.
Best regards
George Milad
[log in to unmask]
National Accounts Manager for Technology
Uyemura International Corporation
Technical Center
240 Town LIne Rd
Southington CT 06489
(516) 901 3874 (mobile)
(860) 793-4011 (office)
(860) 793-4020 (fax)
---------------------------------------------------
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
-----------------------------------------------------