What is the surface of the engineering plate made of?

So the textured and hot plate are PEI, do we know what the engineering plate surface is made of? Or the cool plate for that matter… Was just curious. It looks almost like paint. And are there any particular advantages of using the engineering plate over the others. I’ve found TPU seems to like it.

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Did you ever get an answer to the engineering plate question? I’m curious too. its thicker and heavier.

Unfortunately I did not