>Requesting data / experience with Copper->Nickle->Tin board finish.
>Solderability / shelflife etc ?

Matte Tin (Macdermid ResTIN PC sulfate) over Nickel (sulfamate)
over Copper has been in use here for about 18 months. Early this
year solderability problems arose and were resolved by treating
the Tin bath with a clarifier to remove Stannic Oxide. The 
clarifier is a flocculant from Atotech Canada but is available 
from McGean Rohco in the United States (Roplate Sn Clarifier). it
works. 

By the way, the Technet was invaluable in finding the solution to
our problem. Thanks to all who responded in June.

George Anderson
Uvonics Co.
[log in to unmask] 

--------------------------------------------------------
Uvonics Co., Inc.                    [log in to unmask]

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