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Auto Glass Technology Explained

Frit & 3rd Visor Frit

Road noise is a constant companion for drivers — wind, traffic, tire hum, and highway noise all find their way into the cabin. The acoustic interlayer is a hidden feature inside your windshield designed to absorb that noise before it reaches you.

 

What Is a Frit & a 3rd Visor Frit?

A frit is a solid black ceramic-painted border applied around the perimeter of automotive glass. It serves two primary purposes:

  1. Adhesion: The frit provides a bonding surface for the urethane adhesive that holds the windshield to the vehicle frame. Without it, the seal weakens.
  2. UV Protection: It protects the adhesive from UV radiation, which would degrade the bond over time and compromise the windshield’s structural integrity.

The 3rd Visor Frit is the speckled pattern of black dots you see near the rearview mirror area. It’s a gradient — transitioning from solid black at the edge to smaller, scattered dots toward the center of the glass. Its job is to:

  • Reduce glare and UV exposure in the zone just above the sun visor’s reach
  • Block direct sun from the driver’s eyes when the visor can’t
  • Provide a smooth visual gradient that doesn’t obstruct critical sightlines

 

Where Are They Located?

The frit runs around the entire perimeter of the windshield. The 3rd Visor Frit appears near the top-center of the windshield, in the area behind and around the rearview mirror.

 

What This Means for Your Auto Glass Service

The frit is part of the glass itself — it cannot be added after the fact. If a replacement windshield has incorrect or missing frit patterns, it can compromise adhesion, UV protection, and the vehicle’s structural integrity in a collision.

IQ Auto Glass uses OEM-matched glass that includes correct frit patterns for your specific vehicle.