Uses of black dots on car windows

Although they are just small and insignificant details, black dots on car windows are essential for cars to operate efficiently and safely.

Black “frit” strip

Technically known as a “frit,” this black strip is formed by heating ceramics with the necessary chemical compounds at high temperatures, making them impossible to scrape off.

Frit strips typically run along the edges of car windows, serving the following two main purposes:

The first and most important purpose of the frit strip is to help prevent ultraviolet (UV) rays from damaging the urethane sealant. Because if this sealant is damaged, rainwater will flow into the car through the holes, possibly even causing the windshield to shift, collapse easily and cause unfortunate accidents.

Frits typically run along the edges of car windows. Photo: Jalopnik.

In addition, the frit strip also increases the mechanical and chemical durability of car glass, protects the interior space of the car from being penetrated by liquid and air, and makes the glass surface smooth and shiny.

Black dot "matrix"

As a variation of the frit strip, the black dots we often see gradually get smaller in size from the edge to the middle, to enhance the aesthetics of the windshield.

According to engineers at Pittsburgh Glass Works, because the frits are black, they tend to heat up faster than clear glass. If the temperature rises too high, they can cause the glass to warp. So the dots act as “temperators” that help distribute heat evenly across the windshield.

Although these are just small and insignificant details, for the car to operate effectively and safely, users should not ignore the above details when choosing replacement auto glass.

According to Zing