Thats definetely non stick teflon coating, similar to Freud .

Now i i don't have something clear. Why use burs instead of some ultra sharp sharp micro grain carbide router bit, say 3 flute straight long reach?

I don't see how you will route faster with these compared to normal router bit. Also if you insist on burrr just buy roughing bits.

What size bit, depth of cut, speed and step over? lets do the calc here. cause i dont see it right using these bits on foam.