Typical recommended coating thickness (for our Enthone Alpha-Star
process at least) is 0.15 - 0.3 microns (6-12 microinches). Anything
less than this will lead to poor storage shelf life, tarnishing and/or
poor solderability. As with all surface finishes, there are trade-off's.

Colin

Colin McVean M.Inst.C.T.
Production Manager
Artetch Circuits Limited
Main: 01903 725365
DD:    01903 712926
Email: [log in to unmask]
www.artetch.co.uk
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Crepeau, Phil (Space
Technology)
Sent: 10 August 2006 15:15
To: [log in to unmask]
Subject: [TN] silver embrittlement

hi,

i'm trying to find out what's the safe maximum thickness of immersion
silver to call out on pwb's and smt components to minimize embrittlement
effects in solder joints.  can anybody out there help?

thanks,

phil

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