1. Pass the bending test: the film does not crack.
2. Pass the cupping test: the surface color film does not crack or peel off.
3. Acid and alkali resistance: within 24 hours, soak in 5% caustic soda or sulfuric acid with the same concentration, and the surface will not bubble.
4. Impact test: It meets the 50KG impact test, and the color film on the surface does not crack under the impact of a 180kgf/m² vertical ball.
