Matthew Park wrote:
>
> Ok, How many of you (board fab vendors) are using Kester
> 5631-C2 Protecto as OSP coating for pcb?  I read Kester OSP
> technical spec. 10 times comparing with Entek Plus 106A.  It
> appears that applying Kester OSP as a final board finish is much
> simpler and easier.  That makes me believe that any board
> assembly shop can setup a couple of dip tanks and apply the
> OSP coating with a min cost and training.   Or am I being misled
> by the spec?
>
> Your inputs are very much appreciated.
> Mpark
> NII Norsat International Inc.
>
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> ################################################################Dear Matthew,
It is true that most OSP's can be applied in an immersionn as well as a
conveyorized process. What you should consider is several issues:

        OSP Performance under multiple thermal excursions
        OSP compatibility with no-clean/low residue fluxes
        OSP performnace in nitrogen environment vs air when soldering
        Solder paste spreadability with various solder pastes
        Consistency of the coating during processing
        Thickness of OSP coating and ability to electrically test with
        the coating OSP on the board
        Cosmetics

There are many other considerations as well. I am sure you will recieve a
number of other responses.

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