After the conformal coating is applied, use IPC-2221 or IPC/EIA J-STD-001
criteria for accept/reject.  Type UR is mostly used by military.  It is hard
to remove in rework situations.  Type AR is easier to apply and remove.
Type XY paraxylene is vacuum deposited and only warranted where you need to
get the coating to cover hard to get at areas, and for bettedr moisture
seal.
----- Original Message -----
From: <[log in to unmask]>
To: <[log in to unmask]>
Sent: Tuesday, September 04, 2001 8:53 AM
Subject: [TN] Conformal Coating


> Good morning all,
>
> I hope you all had a nice weekend.
>
> Last week (and a few weeks preceding) I have been part of a group that is
> examining our conformal coating process looking towards the future.  Right
> now, I am in the middle of a classic engineering vs. manufacturing head
> butting exercise.  For some of our engineers, manufacturability seems to
be
> a completely foreign term.
>
> I have been tasked to gather information.  I figure this group is a great
> place to start.  I have two basic questions:
>
> 1)   What specifications do you use to determine if you have a "quality"
> coating in production?  Internal workmanship standards?  IPC-A-610?
> MIL-STDS?  I'm not talking about MIL-I-46058 or IPC-CC-830, since those
are
> primarily procurement documents.
>
> 2)   Can you give me references for papers on the engineering aspects of
> conformal coatings?  Our engineers claim benefits like added vibration
> resistance, thermal emissivity, etc., in addition to the usual moisture
and
> crud barriers.
>
> Thanks in advance.
>
> Doug Pauls
> Rockwell Collins.
>
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