Summary:
You’ve likely noticed the black dots along the edge of your windshield but might have wondered what they’re for. These dots, which become smaller and more spaced out toward the center, are part of a ceramic enamel coating known as the “frit” on the edge of the glass. Contrary to popular belief, they’re not related to radio antennas or defrosting but serve several important functions.
First, the frit helps secure the windshield by providing a bonding point for the adhesive that attaches the glass to the car frame. The black dots on the outside protect this adhesive from UV radiation, which could weaken the bond over time. Additionally, they help regulate the temperature of the windshield during manufacturing by distributing heat more evenly, preventing warping.
Aesthetically, the frit conceals the adhesive. And it creates a more pleasing visual transition from the black border to the clear glass. The dots are placed in a “halftone pattern,” which gradually decreases in size and spacing to create a smoother transition.
Before frits, cars used gaskets and metal trim to secure windshields, but these could fail in accidents. Most modern cars feature frits, and while the dots can wear off over time, leaving the adhesive exposed to the elements, this can be repaired by an auto glass specialist to prevent any issues.
Family Handyman
Read the Full Article
