My Rabbi thought you might have some information about the enamel coatings on ovens if they are cheress or glass or mostly metal?

They are glass-coated steel. Ground/powdered glass (or sometimes, liquefied glass) is sprayed onto the steel, and then it is put into a kiln at about 1500 F. The heat fuses the steel and glass together (in two layers), and gives the two of them properties that they didn't have beforehand. In particular, the glass cannot crack or be scratched, and it can withstand high temperatures and many caustics/soaps.

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