Although the purpose of these black spots, which can be seen in different types of glass, usually on the edge of car windows, is not known by most people, they actually have several very important purposes.
In the technology of the 50s and 60s, it is often used to frame the windshield. metal was used. As technology evolves, glue started to be used.
Actually revolutionary It is a change that takes place, nowadays it is possible to come across these points in a modest car or a luxury car.
This black dot matrix strip is called a frit.
Frit, high heat applied It is a kind of ceramic paint. It is fired at the edges of the glass during production. It is not possible to scrape from glass.
It strengthens the contact between the glass and the car frame.
of the adhesive better grip on glass It makes this possible by creating “carvings” on the surface, making them rougher. Since the adhesive is not visible, the ugly appearance is also prevented.
The urethane sealant that adheres the glass to the frame is protected from ultraviolet rays emitted by the Sun, as it remains under this black band. In this way the adhesive is prevented from melting and a danger that will prevent the windows from holding tightly is prevented. In addition, thanks to the strong adhesion of the glass, rainwater is prevented from entering.
So why is the transition between glass and frit in the form of shrinking dots?
Because the dots are black, they heat up more than other parts of the glass. This design by evenly distributing the heat to the glass reduces optical distortion or lensing that will occur in the glass. The reason for having more on the windshield is to minimize distortion.
Also, if this smooth transition was not there, the sharp color difference would occur. aesthetic was invisible And it was noticeable even from afar. In this way, since the transition is thinner, an aesthetic appearance is also provided.
Sources: Science ABC, techWORM, Bright Side
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