Lou,

Many companies use a Polyimide label that is printed by a thermal printer.
To be specific, one supplier is Brady and the THT series.  These "bottom
side circuit board" labels are designed "for direct exposure through wave
solder and mixed SMT processes"

There isn't an environment much harsher than the wave solder.

Regards,

Phil Nutting
Manufacturing Engineer
Kaiser Systems, Inc.
High Voltage Power Supplies That Work(tm)
126 Sohier Road
Beverly, MA 01915
ph: 978-922-9300
fx: 978-922-8374
[log in to unmask]


-----Original Message-----
From: Lou Hart [mailto:[log in to unmask]]
Sent: Wednesday, November 22, 2000 9:10 AM
To: [log in to unmask]
Subject: [TN] Labeling of PC boards


TechNetters,

Here is a low-tech question.  I have a customer who has been calling for
printing of board numbers, revs, serial numbers using epoxy ink.  This
operation is time consuming, messy, prone to human error.  We've been
talking about using computer-printed paper labels instead of epoxy ink.  The
environment these boards go into is not particularly benign.  Some are used
in train cars.  They get an acrylic conformal coating.

Has anyone had experience in the matter of label durability?  Any test
methods to suggest?  Thanks for any comments.

Lou Hart
412-858-6184
Compunetix

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