Where to Check the Production Date of Automotive Glass?
4 Answers
Automotive glass production dates are typically marked in the lower right corner of the window or below the trademark. Numbers represent the year, while small dots indicate the quarter. Most automotive glass is made of soda-lime glass, with silicon dioxide content exceeding 70%, and the remainder composed of sodium oxide, calcium oxide, magnesium, etc., manufactured through the float process. The glass is then further processed into tempered glass (TSG) or laminated glass (LSG). Laminated glass refers to a transparent adhesive plastic film sandwiched between two or three layers of glass, combining the toughness of plastic with the hardness of glass to enhance the glass's resistance to breakage. Tempered glass is made by quenching ordinary glass to create internal stresses, thereby strengthening the glass. When impacted and broken, tempered glass shatters into small, blunt-edged fragments, reducing the risk of injury to occupants. Zoned tempered glass is a new variety of tempered glass that undergoes special treatment to maintain some clarity in the cracks when impacted, ensuring the driver's field of vision remains unaffected. Currently, most automotive windshields are made of laminated tempered glass or laminated zoned tempered glass, capable of withstanding strong impacts. Methods for repairing damaged automotive glass: Pour glass cleaner onto a towel and clean the area to be repaired; use a blade to remove fragments and apply resin repair fluid; use a syringe to extract air from the damaged area and press down to inject the repair fluid into the crack; apply the remaining repair fluid to the crack and wait patiently; use a blade to remove excess resin and then lightly sand with 1200-grit sandpaper.
Hey, I just helped my neighbor check this the other day. The production date of car glass is usually located in the corners. Specifically, look at the bottom right or left corner of the windshield or side windows, where there will be small dots or symbols engraved. For example, a dot followed by several small dots is a common format—the dot represents the last digit of the year, and the number of dots indicates the month. For instance, 2010 might be represented by the first dot, and two dots could mean January. This makes it easy to calculate the glass's age. I once found inconsistent dates on my own car, indicating the glass had been replaced, possibly after an accident. When checking, wipe the area clean with a cloth and use a phone flashlight for better visibility. This trick is especially useful when buying a used car—if the dates are too old or don’t match, it’s worth noting whether the glass is aging or if the car has issues.
Checking the production date of car glass is actually quite simple, as it is usually located in the corner of the glass. As someone who frequently deals with cars, I look for numbers and dots printed on the edge of the glass. For example, you might find markings like '·1 ··' in a corner of the windshield. The dots represent the last digit of the year, and the dots after represent the month. This system has been commonly used for models produced after 2010. The number of dots for the month ranges from 1 to 12, with two dots representing January, three dots for February, and so on. Knowing this can help determine whether the glass is original, preventing the purchase of a car involved in an accident or with aged components. I always advise friends to check regularly to avoid safety risks caused by deteriorating glass, especially in hot weather when old glass is more prone to cracking. Simple tools are all you need—don’t overlook this small detail.
As a used car buyer, I find the glass production date crucial. It's imprinted with small dots at the corners of the glass - the dot represents the last digit of the year, and the number of dots after it indicates the month. For example, my first car's glass had '·2 ··', which meant it was produced in January 2012. The location is usually at the corner of the windshield or door windows, visible after cleaning. I check this when buying used cars because inconsistent dates can reveal accident history; if the date is later than the car's age, it indicates the glass was replaced. This has saved me a lot of trouble by avoiding concealed safety issues. It's also very easy to check yourself in daily use.
