Identifying Types of Glass

Identifying the type of glass in your windows is essential for understanding its performance in terms of safety, energy efficiency, and durability. One of the easiest ways is to look for a manufacturer’s label or etching in the corner of the pane, which often indicates if the glass is tempered, laminated, or Low-E. Laminated glass can sometimes be spotted by checking the edges for the thin plastic interlayer, while Low-E glass is usually labeled and may show a slight bluish or greenish tint that reflects UV and infrared light. Another simple method is to inspect the window itself—double-pane glass will reveal two layers separated by a narrow space, often filled with gas for insulation, while tinted glass will have a noticeable gray, bronze, or green hue. A UV light can also confirm Low-E glass, since it blocks most ultraviolet rays, and tapping on the surface can help distinguish laminated glass, which produces a duller sound compared to clear or tempered glass. The location of the glass may also give clues, as tempered glass is typically required in bathrooms, entry doors, or near stoves due to its ability to withstand higher temperatures. When markings aren’t present, contacting the window manufacturer or hiring a glazing professional can provide definitive answers. By using these techniques, you can better identify the glass type in your home or building and fully understand its benefits, whether for safety, energy savings, or noise reduction.