If the aluminum-plastic panels at the door head are all made of fireproof plywood, then 3 mm thickness can be selected.

If the aluminum-plastic plate is fixed directly after the skeleton is welded, it is recommended to use an aluminum-plastic plate with a thickness of 4 mm

In addition, in order to ensure that the edge of aluminum-plastic plate does not burst, we suggest that the thickness of aluminum skin should be above 0.10 mm. 3mm thick aluminum-plastic board is made of 12 or 15, and 4mm thick aluminum-plastic board is made of 15 or 18 or even 2 1.