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What is the national standard for the light transmittance of automotive window films?

2 Answers

OLukas

09/08/25 3:05am

The national standard for the light transmittance of automotive window films stipulates that the visible light transmittance of the front windshield and the glass areas outside the windshield used for the driver's viewing zone should be greater than or equal to 70%. Mandatory requirements for film light transmittance: When purchasing automotive sun films, it is essential to pay attention to the light transmittance requirements. The UV blocking rate, infrared heat insulation effect, and visible light transmittance of explosion-proof films can be tested using professional sun film testing equipment. The light transmittance of automotive glass after film installation can be easily measured using a split-type light transmittance meter, providing a simple and convenient way to obtain the light transmittance value after film application. National legal regulations on film light transmittance: No mirror-reflective sunshade films are allowed to be applied to any window glass. For highway buses, tourist buses, and school buses, the visible light transmittance of all window glass must be greater than or equal to 50%, and no opaque or mirror-reflective colored or heat-insulating papers are permitted.

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AlexisLynn

09/19/25 8:44am

I've been repairing cars for over a decade. The national standard GB 9656 clearly specifies the light transmittance requirements for window films. The standard mandates that the light transmittance of the front windshield must not be less than 70%. This value isn't arbitrary—research shows that below 70%, it can impair nighttime driving visibility, making it harder to see road conditions and increasing accident risks. The total light transmittance after film installation must exceed 70% to pass inspection, and specialized equipment is used during annual inspections to measure it. If it doesn't meet the standard, the car won't pass inspection, and the film will need to be replaced. The requirements for side windows are slightly more lenient, usually requiring at least 50% light transmittance, but the front windshield is the critical area. Therefore, I recommend car owners choose branded films and have them installed at professional shops to ensure the light transmittance meets requirements. Don't opt for cheap, low-transmittance films just to save money—safety should always come first. Skimping on this could lead to serious trouble.

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