What is the reason for two rows of dots appearing on the Lavida's glass date?

[VanJulia]

Generally, the production date on the vehicle's glass is indicated by a number followed by black dots. The dots in front of the number are subtracted from 7, and those behind are subtracted from 13, which corresponds to the production date. Below is relevant information: 1. Body dimensions: The length, width, and height are 4605mm, 1765mm, and 1460mm respectively, with a wheelbase of 2610mm. 2. Color scheme: The Lavida inherits the traditional 'dark top and light bottom' color combination of Volkswagen models in China. However, referencing the design style of Japanese mid-size cars, a wooden trim that integrates with the center console is added between the two.

[AliviaRose]

The other day when I was washing my Lavida, I also noticed two rows of small black dots in the corners of the windows. After some research, I learned that these are markings left by the production process. When glass factories bake laminated glass, they fuse a layer of material called ceramic glaze at the edges under high temperatures, much like firing ceramic ware. These dots are traces of ink that didn’t fully melt, helping the glass heat evenly and preventing edge cracks during summer heat exposure. I specifically asked the technicians at the 4S店, and they said this design is common in German cars, especially Volkswagen and Audi models. Some people mistake them for film bubbles or glass cracks, but they actually require no treatment. In fact, the dot patterns can help identify the glass production date—for example, my car’s dot matrix ‘••• ••••’ indicates it was produced in the 4th week of 2023.

[VonAutumn]

I remember when I first picked up the new car, I stared at those tiny dots along the lower edge of the windshield for a long time. Later, after checking the maintenance manual, I learned that those are sintering marks from high-temperature ceramic ink, and they serve important functions. On one hand, they help the black border adhere more tightly to the glass, reducing the risk of chipping. On the other hand, they provide heat dissipation and buffering for the glass edges in summer—after being exposed to the sun, the black border area feels cooler than other parts. An experienced mechanic from Shanghai Volkswagen told me these dots also act as a hidden code for the glass production date, with the number of dots indicating the quarter and month. However, I noticed the dot pattern on the rear window features a fade-out design, transitioning from solid dots to transparent ones, ensuring they don’t obstruct the rearview mirror’s visibility. The designers really put thought into this.

[Eva]

When replacing the wiper blades on my Lavida before, I noticed those rows of sesame seed-sized dots at the wiper park position. These are actually a natural phenomenon from the high-temperature firing process—when 1500°C ceramic glaze covers the glass edge, these tiny dots are intentionally left to balance thermal expansion pressure. A workshop technician taught me a trick: the number of dots can indicate the production date, for example, 16 dots represent the 16th week. Once during a hailstorm, my neighbor's car window edge chipped with blackened borders, but the dotted area remained intact, proving its effectiveness in dispersing impact forces. However, be cautious—avoid scrubbing these spots with hard brushes during car washes.