As an electronics manufacturer who sells equipment all over the world, I've been up against RoHS/WEEE compliance for quite a while. There are piles of regulations and exemptions. The basic materials involved are lead, mercury, hexavalent chromium, cadmium, polybrominated biphenyls and polybrominated diphenyl ethers.
They allow up to 0.1% of those within a product except cadmium, where they allow up to 0.01%.
If Cermark doesn't leave any of those behind, you are golden. Even if it does, my guess is that the thickness would be so thin (microns) that it probably would pass anyway. But that's just a guess.
I suspect the Cermark people are well aware of RoHS, so could probably easilly answer if you call them.
BTW, they will need to supply you with an RoHS compliance certificate for the material, and you will need to provide one of your own to your customer specifying that the item complies with RoHS.
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