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| From [log in to unmask] Thu May 16 13: |
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Maurice Dore * <[log in to unmask]> Wrote:
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| What is the shelf life of Copper bare boards with OSP finish.
| What is the nominal RH at which the board may be stored at.
| If it's 45% RH, what's the effect if environment RH is
| increased to 60%
| ie what effect will an increase of RH have on the PWB during
| storeage?
| Thanks in advance.
|
Since Maurice brought up the shelf life issue of Cu bard boards with OSP
finish, I'd like to add another similar topic to the discussion. That is
- What is the shelf life of electroless Ni / immersion Au surface finish?
And what is the appropriate storage environment? Due to the advancement
of PCB new surface finishes, a discussion like this will help to promote
the understanding of their impact on solderability and reliability of
end-product.
To Maurice: In August 1995 edition of Electronic Packaging & Production,
there is a paper titled as Alternatives to HASL: A User's Guide For
Surface Finish. OSP is said to have 12 month shelf life with some process
dependency. It is a very good reference to have.
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