Thermally tempered glass is a monolithic glass that is gradually heated to a softening temperature between 575ºC and 635ºC and then cools very quickly. In this way it is achieved that the glass has greater structural and impact resistance than untreated glass, having the additional advantage that in case of breakage it fragments into small harmless pieces (which is why it is considered a security glass).
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.