The monolithic glass does not have any treatment. It is the common glass. It is called "annealed" or "float", terms that refer to its manufacturing process.
Float glass or monolithic glass consists of a sheet of glass manufactured by floating the molten glass on a layer of molten tin. This method gives the glass a uniform thickness and a very flat surface. It is also called flat glass.
Completely transparent glass, 2 mm thick, with unpolished edges, ideal for use in photo frames.