How to Check the Production Date of Car Window Glass?
2 Answers
Method to check the production date of car window glass: You can find a code at the bottom left or right corner of the window glass, consisting of numbers and several small black dots. The small black dots indicate the production month of the glass. Some glass panes have the dots before the numbers, while others have them after. If the dots are before the numbers, subtract the number of dots from 7. If the dots are after the numbers, subtract the number of dots from 13. The result will be the production month of the glass. Car glass is manufactured by heating the glass in a furnace to near its softening temperature, then quickly transferring it to air grids with varying cooling intensities for uneven cooling, creating different stress levels between the main viewing area and the peripheral areas. Typically, glass produced this way is zone-tempered glass.
The production date of car window glass is usually printed in the corner of the glass edge, where you can see some small dots and numbers combined. I drive used cars more often and have noticed that the dots typically represent the month, while the numbers are the last two digits of the year. For example, if there are four dots around the number, dots before the number indicate the month, and the number is the year; dots after the number mean the opposite order. For instance, '20 dot dot' would mean February 2020. After checking a few times, you'll get the hang of it, and it can help assess the car's condition—older glass may become brittle with age, affecting safety in accidents. This trick is quite useful when buying a used car; don't just focus on the paint, checking the glass date can also help avoid pitfalls. Make it a habit, and be extra careful when the location is hidden.
