What Are the Black Dots on My Windscreen?

What Are the Black Dots on My Windscreen?

The black band around the edge of your windscreen, and the pattern of dots that fades into the clear glass, is called the frit. It looks like decoration, but it does several practical jobs — and it matters when a windscreen is replaced.

What the Frit Is

The frit is a black ceramic enamel painted onto the glass and baked in during manufacturing, so it becomes part of the glass surface. It will not scratch or peel off like a sticker. You will usually see a solid black band around the edge, then a pattern of dots that gets smaller as it moves towards the clear area.

Why It Is There

Protecting the adhesive from UV light

A windscreen is held in with a strong urethane adhesive. Sunlight breaks that adhesive down over time, and the frit shades it. In a city with UV levels like Sydney’s, that protection helps the bond last.

Giving the adhesive a surface to grip

The slightly rough enamel surface helps the urethane and primer bond to the glass.

Hiding the adhesive and trim

Without the frit you would see the bead of black adhesive and the body frame through the glass. The band gives a clean finish from inside and out.

Why the dots fade out

The solid black band heats up faster than clear glass in the sun. The dot pattern spreads that heat difference out gradually, which reduces stress at the boundary and helps reduce visual distortion where the black band meets clear glass.

The Area Behind the Rear-View Mirror

Many windscreens also have a larger black area or a dot pattern behind the rear-view mirror. On cars with driver-assistance systems, this area often surrounds the camera and sensor mounting, and on some cars it acts as a sun shade for the area between the sun visors. If you want to check whether yours has a camera, see how to tell if your windscreen has a camera or sensor.

What This Means When Your Windscreen Is Replaced

• A replacement windscreen should have a frit band that matches the original, so the adhesive is protected and hidden.
• On cars with cameras or sensors, the frit and mounting area need to suit the vehicle’s system. Calibration costs vary by vehicle and are quoted separately; Aussie AutoGlass coordinates with specialist calibration providers where it’s needed.
• The glass markings tell you who made the glass and the standards it meets — see car glass markings explained.
• Quality aftermarket glass and OEM glass both carry a frit; our guide to OEM vs aftermarket windscreens covers the differences.

Frequently Asked Questions

Can the frit be removed?

No. It is fused into the glass during manufacturing and is a permanent part of the windscreen.

Is it normal for the frit to look slightly different on a replacement windscreen?

Small differences in the dot pattern between manufacturers are normal. What matters is that it covers the adhesive properly and suits any cameras or sensors.

Why do I see waviness near the black dots?

Some slight distortion close to the frit can be normal because of how the glass is formed and heated there. Distortion in the main viewing area is not normal and should be checked.

Does the frit affect toll tags or dashcams?

Toll tags and dashcams are usually mounted near the rear-view mirror. See our guide to refitting your toll tag and dashcam after a windscreen replacement.

Need your windscreen checked or replaced? Aussie AutoGlass is a mobile service across greater Sydney — we come to your home or workplace. Book an appointment or call 0405 412 951.