manufactured product vitreous enamel 2020-08-03T18:18:43Z porcelain enamel A smooth, durable vitreous coating which is made by fusing powdered glass to a substrate. Enamel can be used on metal, glass, ceramics, stone, or any material able to withstand the fusing temperature. Enamel is made by 1) firing, melting the powder and 2) allowing allowing it to flow across a surface to then harden.