Performance testing standards for automotive color changing films: assessment of weather resistance, scratch resistance, and self-healing ability

The performance of color changing film is directly related to user satisfaction, and the industry has formed a complete testing system.

1. Weather resistance test

Xenon lamp aging test: Simulate 5 years of outdoor exposure, and the color difference Δ E ≤ 3 is qualified.

Salt spray test: spray in 5% NaCl solution for 96 hours continuously, and the film surface is free of corrosion.

2. Scratch resistance performance

Steel wool test: Use # 0000 steel wool to rub back and forth 100 times under 500g pressure, with a scratch depth of ≤ 5 μ m.

Sand drop test: Free fall of 1kg quartz sand from a height of 1m, with no penetrating damage to the membrane surface.

3. Self healing ability

Hot repair test: Heat the scratched area with a hot air gun to 80 ℃, and after 24 hours, the scratch disappearance rate is ≥ 90%.

Chemical repair test: After spraying gasoline on the membrane surface and wiping it, there is no swelling phenomenon.

Third party certification: The German T ü V certification requires that the color changing film has no delamination during temperature cycling from -40 ℃ to 90 ℃; According to laboratory data from 3M Company in the United States, its TPU color changing film maintains a tensile strength retention rate of 85% after 1000 hours of ultraviolet irradiation.