Does Car Glass Block UV Rays?
2 Answers
It depends on the material of the car glass. If it is made of organic glass, resin glass, or plastic glass, it can effectively block ultraviolet (UV) rays. Ordinary glass can block over 90% of UV rays with wavelengths shorter than 300nm, but it fails to block 90% of UV rays with wavelengths longer than 350nm. Quartz glass and silicon dioxide glass, however, cannot block UV rays at all. More details about UV-blocking glass are as follows: 1. Introduction: UV-blocking and heat-insulating glass is a special type of glass. Under strict smelting conditions, metal oxides are added to ordinary silicate glass, giving it the unique property of absorbing UV rays, thus transforming it into UV-blocking and heat-insulating glass. Alternatively, post-coating or film technology can be applied to ordinary glass to achieve heat insulation and UV-blocking functions. 2. Functions: It filters sunlight, reduces skin damage caused by UV rays, and has the ability to block UV transmission. It also helps maintain interior temperature, ensuring air conditioning efficiency and minimizing the impact of external temperature or sunlight on the cabin.
Actually, I think many car windows nowadays do have UV protection, but the effectiveness varies depending on the type of glass. Windshields are mostly laminated glass with a special film sandwiched in between, which can block almost 100% of UVB rays—the most harmful for skin burning—and over 80% of UVA rays, making them quite reliable overall. However, side and rear windows are typically made of regular tempered glass, offering weaker protection. During long drives or under intense summer sun, UV rays can easily penetrate, not only accelerating skin aging but also causing fading and cracking of interior seats and dashboards. So if you drive an older or lower-end model, you might need to apply professional UV-blocking film for added protection. Choosing a film with the right light transmittance can also help avoid glare. In short, when buying a new car, ask the dealer about the glass specifications, and maintain regular cleaning to preserve UV protection.
