Hi, everyone

I'm searching for a manufacturer that could supply us with copper clad Al2O3
ceramics. We would like to have the substrate material at around 250um with
a 100 - 110um copper layer on top of it. Since the copper has to be etched
in shape it would be great if it comes already with a photo positive
coating, quite similar to the standard PCB boards.
Does anybody have experience with this?

Thanks,

Reiner Witte