Hi Dale:
I'd have to see pictures, and your welcome to send them to me
[log in to unmask] but I think Don has hit this on the nose. Metal trapped
in Mask comes from the undercut breaking away (in process) or poor
pre-cleaning prior to process. (My experience.) (It is possible that there
tack oven is old, rusty, and needs their blower or air intake filtered, but
thats usually dust, not metal. It is unsightly, and I wouldn't ship it
myself, but there are specifications that can justify acceptibility if the
Fab house wants to fight you.
Your best response is obvious (aside from asking the forum for assistance)
and that is to find another fab house if you can't come to terms with them
over your expectations for finished product.
SIf you haven't shoot their QA folks a friendly "Hey look what I found." It
may be an inspectors off their game, or out to get even, and letting it
slide, they may have a serious problem, a new production manager whose mean,
or a new QA manager whose not. No matter what, you shouldn't have to pay
the price.
I would like to see what they look like though so I look forward to the
photos.
Good Luck,
Steve MacDonald
----- Original Message -----
From: "Dale Ritzen" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Tuesday, December 10, 2002 14:52
Subject: [TN] Metal Debris in Solder Resist
> Since IPC-A-600 doesn't have much to say about this...
>
> We recently started seeing quite a lot of metallic debris encapsulated in
> solder resist from several of our board suppliers. These bare boards are
to
> be used as a class 3 SMT/PTH platform. There are few references to this in
> any standard I have read (including IPC-A-610, sect. 7.2), so I'd like
some
> feedback on what everyone else is seeing these days and on what they
> believe the problem to be (or if they don't believe it to BE a problem).
>
> My take on it is that some board houses may be taking short cuts or saving
> money by not using fresh solder resist as often as needed, thus building
up
> the amount of debris left over from each previous board that has been
> coated and leaving it on the following boards. Filtering the resist to
> remove this debris before using it again would be helpful, if workable. As
> the end user of this I find it bothersome (even though it IS encapsulated
> by the resist) as it indicates to me that the supplier may be trying to
cut
> corners in the current economic climate.
>
> Okay, so is this a real problem or is it a "who cares" issue? On a board
> that is to be used as a class 3 platform, it seems to me that this IS an
> issue, especially in the rising incidents of debris seen in the resist.
>
> I have pictures of what I'm talking about. If you'd like to see them send
> email and will forward them to you for review. Thanks!
>
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