Here are some I have tried;

Metallic inks,
solder resist - add a little thinner to make it runny enough to write with
and apply with fine brush,
engraving pen,
paper label with polyimide tape (gold tape) over the top

We used to life test at 220C for 1000hrs and marking was indeed a pain.
The first two methods need a brush for application so are a bit fiddly. The
last two methods were overall winners with method four firm favourite for
speed and convenience.  Ordinary soft graphite pencil is best for marking
the paper part of the label. I suppose reflow temperatures are higher but
exposure is much shorter so you might be OK.

Rob



                                                                                       
                                           
                      "Stephen Casey"                                                  
                                           
                      <[EMAIL PROTECTED]        To:       "Protel forum" <[EMAIL 
PROTECTED]>                          
                      ee.co.uk>                cc:                                     
                                           
                                               Subject:  [PEDA] A little OT - PCB 
labelling                                       
                      05-Jun-2003 01:17                                                
                                           
                      PM                                                               
                                           
                      Please respond to                                                
                                           
                      "Protel EDA                                                      
                                           
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Hello all,

What methods of labelling would you recommend for unique identification of
PCBs. We have been using thermal printed labels for serial numbers etc, but
these are destroyed if a board is reworked. The boards have an area for
hand
writing serial numbers, but this is removed when solvent cleaning!

I need a simple method of labelling individual boards, that'll withstand
high temperatures and solvents! Any ideas?

Thanks a lot.

Steve.









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