I have not contacted the manufacturer specifically, and in the owners manual that came with it it did not say anything about it.
Did you see where it appeared to be? Because the walls of the furnace are coated with a hard, ceramic-looking substance, but the top of the lid has the material on it in question.
Thank you for the tip about the location. The site was not the most useful, I mainly put it there so people could better know what I am talking about (I have since learned that off site links are a no-no.) Sorry about the terminology confusion, I am still working out the differences between other terminologies. Yes it is a melter, I intend to be working with UBC scrap to start, and maybe moving on to pure copper scrap later. I hope that clears up any confusion.