Film Impact Endurance Test Methods:
The temperature is 23±2℃, and the relative humidity is 50％±5％.

Film Impact Endurance Test Steps:
Put the coating test color coated steel coil film above the iron sticks, and the impact edge is more than 15 mm.
Use the heavy punch to fix the control equipment on the other side of the barrel. Press the button, then the heavy punch will hit the punch freely.
List the heavy punch and get out the test panel.
Record the height. Do the experiment for 3 times.

Results
Use the 4 times magnifier to check the test panel, and find weather there is cracks, wrinkle and flake or not.