Where is the production date of car glass located?
2 Answers
The production date of car glass is located in the lower left corner of the glass, where there is a series of symbols. Below these symbols, there will be a number corresponding to the production year. This number can be used to check the production date of the window glass. The digits represent the year of production, and the small black dots represent the month of production. Car glass is manufactured by heating the glass in a furnace to a temperature close to its softening point, then quickly transferring it to air grids with different cooling intensities for uneven cooling. This process creates varying stress levels between the main viewing area and the peripheral areas of the glass. Typically, glass produced this way is zone-tempered glass. The peripheral areas, located in the strong air flow of the grids, undergo full tempering, resulting in good fragmentation and high tempering strength. The main viewing area, located in the weak cooling zone of the grids, has larger fragments and lower tempering strength.
I remember feeling quite excited the first time I looked for a car glass production date by myself. It's usually printed in a small area at the corner of the windshield or window, such as the lower right or lower left corner, appearing like a series of small dots and numbers. The dots represent the last digit of the year—for example, one dot might mean 2020, and two dots could indicate 2021. Numbers accompanied by dots denote the month, like "1·" for January. Finding this requires bending down for a closer look, but avoid using hard objects to wipe it to prevent scratches. Knowing the production date is crucial, especially when buying a used car: it helps you determine whether the glass is original or has been replaced later, as original factory glass is generally more reliable and safer. It's recommended to use a phone flashlight for better visibility in dim lighting. If you wash your car frequently, be careful not to let cleaning agents obscure the markings.
