Why do car windows have little black dots?

[Naresh Kumar Kukkar]

The little black dots on your car’s windshield and windows and the black rims that surround them aren’t just there for decoration. The dots date all the way back to the 50s when car manufacturers used adhesive to hold car windows in place rather than metal trim. The black trim around the windows (called “frits”) and the black dots are painted onto the glass to hide the not very appealing look of the adhesive. The rims are actually baked into the window, so they hold the glue and window in place. The dots serve as an aesthetically pleasing transition from the thick black line to the transparent window. They aren’t just there to look nice though, they help to provide temperature control. When the glass is bent to fit into the frame of the windshield it’s heated up, the black-painted glass heats up faster than the rest of it, the dots help to distribute the heat more evenly and keep the glass from warping.  

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Naresh  Kumar 

Govt. Approved Valuer (Plant & Machinery)

IBBI Regd. No. IBBI/RV/02/2019/10907

Insurance Surveyor

Chartered Engineer

Ph. No. -9814706491, 01638-254054

Address for Correspondence - 1471/83, ganesh nagri , Jalalabad-152024 ( Punjab )