There are multiples ways of treating glass for strength, energy efficiency, or appearance. Diversified Glass & Mirror suggests some:

Float glass:  gets its name from the modern process to create large, thin, flat panels from molten glass. This process produces a very smooth piece of glass with highly consistent thickness.

Fully Tempered Glass:  is ideally used as a safety glass where the glazing may need to be broken out of the frame in an emergency. For instance, the side windows of a car are tempered so that they can be broken away in the event of an accident.

Heat Soaked  tempered glass : is  a method of testing tempered  glass for unstable nickel sulfide inclusions, which are imperfections in the glass that may cause spontaneous breakage of the pane. The panes of glass are put in an oven and heated to a temperature of around 550 degrees Fahrenheit for a few hours. This cause any nickel sulfide inclusions to expand disproportionately to the glass, which makes the glass break. The idea is to force any unstable glass panes to break before they have a chance to fail in the field. Of course, the process increases the cost of the glass panes. It is important to note that heat soaking it is not a perfect process and it will not eliminate incidents of spontaneous break, but will catch most of them.

LA mined glass:  is made by fusing two or more layers of glass with inter- layers of polyvinyl butyral (PVP) though the use of heat and pressure. The process creates a safety glass.

Laminate glass: is best used as safety glass where the glazing must remain intact if it broken, either for safety or security. For instance, the windshield of a car is laminated heat- strengthened glass so that if an object hits it, the objet won’t pass through and injure an occupant nor will the glass shatter into the face of the occupants.