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Sat, 14 Mar 1998 08:05:19 -0800 |
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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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Please visit IPC web site (http://jefry.ipc.org/forum.htm) for additional information.
For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311
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