window film parameters

We feel hot because ultraviolet, visible, and infrared rays from sunlight radiate heat to our skin. The heat absorbed by the skin raises our body temperature, making us feel hot. A good window film, however, allows more visible light to pass through while blocking ultraviolet rays and heat as much as possible, maintaining both heat insulation and clear visibility. This creates a comfortable driving and riding environment.

In the window film industry, there are different standard parameters to measure product performance. The most mainstream international standards are NFRC (National Fenestration Rating Council) and GA/T744 (Public Security Industry Standard of the People’s Republic of China: Automotive Window Sunshade Film). Due to the different testing standards, some parameters also differ to some extent.

Total Solar Energy Rejection (TSER) simply means how much solar heat energy the window film blocks. A higher TSER value indicates better heat insulation, and vice versa.

Infrared blocking rate (IR-Block): Most heat energy comes from infrared rays in sunlight. The higher the infrared blocking rate, the better the heat blocking effect, and vice versa.

UV-Block rating indicates how much ultraviolet radiation it can block. The higher the value, the better the blocking effect on ultraviolet (UV) radiation, and vice versa.

Visible Light Transmission (VLT) refers to the percentage of visible light that passes through the coated glass. Simply put, it’s the percentage of light wavelengths visible to the human eye that are transmitted. The higher the VLT value, the brighter and more transparent the object; the lower the VLT value, the darker and less transparent the object.

Visible Light Reflectance (VLR) refers to the ratio of light rays reflected when they strike an object. A higher VLR value indicates a stronger specular reflection effect, and vice versa. Internal reflection should be as low as possible to avoid obstructing the driver’s view.