Phil,

I use Barco Bond M-100X as the base, I also will grind up some circuit 
board to add to the adhesive to give the fill some board body if the 
area is large.   There is usually some unused portion of the board that 
using a rasp one can obtain enough filler material to do the job to add 
it to adhesive.   You can also mill out the area, and using a piece of 
scrap board mill a patch and epoxy it in place.  I have done it both 
ways and it depends on the size of the divot.

Pat Goodyear


On Fri, Jun 21, 2013 at 6:20 AM, Nutting, Phil wrote:

> Good morning all,
>
> This is a question regarding the repair of FR-4 after there has been a 
> high voltage arc/burn.  In a recent failure we ground out all the 
> burned material and "repaired" the board with 5 minute epoxy.  This is 
> on a pancake connector for a 160kV x-ray tube.  I am of the opinion 
> that 5 minute epoxy will soon fail as it does not have the same 
> insulating characteristics as the base FR-4.
>
> I see that Circuit Technology carries all sorts of repair 
> materials/kits.  So, if you were to salvage a burnt circuit board that 
> had to ship right away, what materials would you use?
>
> Off line replies are accepted if you want to protect your sources or 
> don't want to "advertise" on Technet.
>
> Thanks in advance for your wealth of information,
>
> Phil Nutting  |  HVP Development Engineer   |  Excelitas Technologies 
> Corp
>
> Office: +1 978.224.4152
> 35 Congress St, Salem, MA  01970 USA
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