1.Check out if the thickness meets the requirements, and if necessary, measure it with a vernier depth gauge. A magnet should also be prepared to check whether the selected plate is iron or aluminum.
2.Check out whether the surface of the aluminum plastic plate is smooth, whether there are ripples, bubbles, defects, scratches.
3.Break off the corner of the aluminum plastic plate at will, if easy to break, it is not PE material, or it is adulterated with counterfeit materials; Then you can use a lighter that you carry with to burn it. If the real PE should be completely burned, there will be impurities after burning with fake and shoddy materials.