Tips&TricksThe essential role of the windshield's black dots decoded

The essential role of the windshield's black dots decoded

Black dots on the car window are not a decoration
Black dots on the car window are not a decoration
Images source: © Brilliant

9:21 PM EDT, May 4, 2024

Many people have never given it a second thought, and others have hardly noticed this seemingly insignificant detail on their car. The black dots on the windshield are not mere specks of dirt but play a much more significant role. And no, they're not for decoration. So, what is the purpose of those black dots on car windshields?

This feature on nearly every vehicle—older models being the exception—might pique your interest. Could it be a fashionable trend within the automotive industry? Far from being a trivial or accidental design element, these tiny dots have a practical function that merits further exploration.

Unveiling the mystery of the black dots on the windshield

Although the term 'feature' might seem vague, it refers to a crucial component of every vehicle. The absence of these black dots on windshields and even on mirrors would significantly impact the driving experience. This is particularly true for the dots on rearview mirrors, which help prevent glare from other vehicles' lights, thus enhancing safety. The dots effectively divide the mirror's reflection into aspherical and spherical zones.

The aspherical zone broadens the driver's field of vision, reducing dangerous blind spots - a critical yet often underestimated safety measure. On the other hand, the spherical zone, commonly found on older vehicles, does the opposite. Additionally, the number of dots can reveal the month of production, and a specific number denotes the year the glass was manufactured, making it easier to verify if all windows are original.

The significance of the windshield's black dots explained

Creating these black dots starts during glass manufacturing, utilizing screen printing to ensure durability and resistance. Their presence, more or less noticeable depending on the glass type, results from fusing particles with the glass surface. The key to their functionality is using frit, or the black dots, in the glass-gluing process. This approach facilitates a smooth assembly and ensures a strong bond that withstands varying atmospheric conditions. This detail is crucial for maintaining the stability of the glass and preventing excessive heat buildup inside the vehicle.

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