Does Car Window Glass Block UV Rays?

[DeJanelle]

It depends on the material of the car glass. If it is organic glass, resin glass, or plastic glass, it can effectively block ultraviolet rays. Ordinary glass can block over 90% of UV rays with wavelengths less than 300nm, but it cannot block 90% of UV rays with wavelengths greater than 350nm. Quartz glass and silicon dioxide glass, however, cannot block UV rays. Here is some additional information: 1. About UV rays: UV rays are a dangerous sunlight hazard. With their relatively long wavelengths and strong penetrating ability, they can penetrate the skin's surface, reach tissues below the dermis, and damage the skin's fine structures, such as collagen and elastic fiber tissues, causing wrinkles and fine lines, and leading to skin relaxation and aging. This is medically referred to as photoaging. 2. Harm to the human body: In the energy distribution of UV rays in sunlight, UVA is 15 times that of UVB and is the main cause of skin tanning. It can reduce the content of hyaluronic acid, which binds water in the skin, leading to dry skin, accelerating melanin formation, darkening the skin tone, and is also an important cause of skin cancer.