I use these to paint a dot on a BGA if it is reworked. Two dots signify
two reworks, etc.
No matter what system is in place to track multiple reworks, there is
noting like a bright orange paint dot to heighten the rework operator's
awareness that the component has already been reworked once (or twice,
or 3X,.....)
The paint pens can be used to mark sernos on all kinds of components,
boards, etc. It takes about a 10 minute cure at 100 C, after that there
is nothing that can remove the ink.
You will need to ensure the customer is OK with this. It is not a
low-outgassing ink, but those are available from some companies as well,
for space use.
I believe the companies that make the white PWB silkscreen ink also make
pens for touching up that same ink. That is a low-outgassing ink, but
requires a longer cure time. However, it is the same ink as is used on
the PWB, so it is already qualified from a materials compatibility
standpoint.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Ioan Tempea
Sent: Thursday, July 17, 2008 9:35 AM
To: [log in to unmask]
Subject: [TN] Indelible marking
Dear Technos,
I need to serialize about 200 BGAs (simply write on them sequential
numbers 1-200). The BGAs will be assembled, SnPb process with water
soluble flux, then washed in plain water in our in-line washer.
In case the customer will not accept us scratching the numbers onto the
top of the components, what kind of permanent ink can I use?
And would you see any issue with scratching the top of the components?
Thanks,
Ioan
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