The 0.2 is 2 X 2116, and 0.4 is same + 1x 7628.
Anil
On 30 Dec 2014 20:46, "Lawrence Dzaugis" <[log in to unmask]> wrote:

> 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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