After forming and cutting, this type of glass, also known as toughened glass, is placed in a thermal cycle, so that first, the glass is heated to a temperature of 600-700 degrees, and then is rapidly cooled, which increases strength glass 5 to 10 times. In addition, due to surface tension created by the rapid cooling, if breaking, this type of glass breaks into small and fine particles and no sharp edges will be produced, that greatly reduces the possibility of damage to passengers. Any cutting and bending operation after tempering operation will cause this type of glass to break, and all operations must be done before tempering. In most cars, (except those vehicles with all laminated windows) tempered glass is used as side and rear glass. Tempered glass is easily recognizable from a distance, just on a sunny day, you should wear polarized sunglasses on your eyes and look at edges of a tempered glass. In this case, symmetrical forms that emerged during the operation of tempering the glass would be seen.
Other advantage of laminated glass is their reparability. When cracking (in the case of minor cracks), only the glass at outer side of PVB would be cracked, and the glass inward would not be damaged. The cracks on outer side will also be repaired to an acceptable level a few days after the accident. As you probably guessed, due to listed properties, laminated glass is commonly used as the windshield in automotive. However, over the past 10 years, in some limited cases they have been used as side and rear windows, and now, the use of this type of glass as side and rear windows is trending.