Why are there black dots on car glass? Know the real work of Frit Band

You must have often noticed small black dots on the edges of the front windshield of the car. Especially on the sides and upper part, these dots appear in a dense pattern, which looks like a black stripe from a distance. These dots are not a defect or a design flaw, but an important part of modern automobile engineering.

These are called dot matrix or frit band. These black dots play an important role in connecting the windshield firmly with the car body, protecting it from UV rays and making it beautiful in terms of beautification. Let us know why it is necessary to have these black dots in the car mirror?

What are dot matrix or frit bands?

These black dots are actually made of a special paint called ceramic frit. In the process of making windshield, they are fused with glass at high temperature. These dots start out denser at the edge of the windshield and taper off toward the center, creating a smooth gradient. Let’s take a look at their work.

1. Hiding the sealant: Strong urethane adhesive is used to attach the windshield to the car frame. These black dots hide the black glue from outside, due to which the look of the car remains clean and professional.

2. UV Protection: The sun’s ultraviolet rays can weaken urethane sealants over time. The black ceramic dots block UV rays, keeping the bond between the glass and body strong for a long time. This can also prevent water leakage or loosening of the glass.

3. Reducing Thermal Pressure: Thermal expansion of glass and metal is different. The gradient pattern of dots reduces stress caused by temperature, thereby reducing the risk of cracks on the windshield.

4. Aesthetics and Privacy: These dots give a modern look to the car and also provide some degree of privacy to the driver. Also, the wipers help in better fitting of the dashboard and other components.

Are these bindis harmful?

no way. These are completely safe and increase the strength of the windshield. If these dots ever fade or start disappearing, it could be a sign of reduced life of the glass or an accident. All current SUVs, sedans and hatchbacks can be seen with these points.