Black sheet
Black sheet, also referred to as iron plate, is an untreated sheet metal that is extremely prone to rusting, at different rates depending on the composition of the external environment. To avoid corrosion, the sheet plate is surface treated (powder coated, for example), usually using an epoxy-polyester mixture. The coating process is free of aromatic solvents and heavy metals.
This quality is most frequently used for light fittings designed for use in a dry environment such as offices, corridors, classrooms, etc.