You have a single ply of fiberglass. The finished board can be rolled into a tube. It is not stable material. It is a cheap bend once material. The entire process has to be looked at. Any heat or strain on the material can deform it. Assembly has the same challenge.

I had to work with the board supplier to end up wit useable product. It was much cheaper than flex material in the application.



Anil Kher <[log in to unmask]> wrote:
>We have yield issues in production of 500 mm size panels in pattern to hole
>alignment within 50 microns.
>Never thought fr4 panel will distort.
>Can anyone guide me on distortion of panel - 0.2 and 0.4 mm thick h/h
>Thanks a lot
>Anil Kher
>
>
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