How to Determine if the Windshield is Double-Layered?

[DanteLynn]

Hollow glass usually contains desiccant or is filled with inert gas, with desiccant being more common, while double-layered glass does not have these; The edges of hollow glass are sealed with sealant, typically black in color; double-layered glass lacks this sealing, making it prone to moisture and dust ingress.

[VanAlexandra]

Having driven for over a decade, I've found it quite simple to determine whether the windshield is double-layered. First, inspect the edges of the glass—run your finger along the corners. Double-layered glass usually has noticeable stratification marks with a transparent adhesive interlayer in between. Alternatively, lightly tap the glass to listen to the sound; single-layered glass produces a crisp 'ding-ding' sound, while double-layered glass sounds duller. Also, check the markings in the corners for labels like AS1 or LAMINATED—if present, it's definitely double-layered. During rainy drives, double-layered windshields fog up much slower and offer better noise insulation, significantly reducing tire noise on highways. Once, when a small stone hit my car, the single-layered side window shattered completely, but the windshield only developed a spiderweb-like crack—that's the protection of double-layered glass at work.