The uniformity of the surface of 8021 flexible packaging aluminum foil is particularly important. Uniform gloss, no lines and no vibration marks are the basic requirements.
8021 aluminum foil laminated with thick cardboard is required to have the same plasticity as the first type of aluminum foil.
| Component Elements Properties | Metric | English | Comments |
| Aluminum, Al | 97.9 – 98.8 % | 97.9 – 98.8 % | As remainder |
| Iron, Fe | 1.2 – 1.7 % | 1.2 – 1.7 % | |
| Silicon, Si | ≤ 0.15 % | ≤ 0.15 % | |
| Copper, Cu | ≤0.05 % | ≤ 0.05 % | |
| Other, each | ≤ 0.05 % | ≤ 0.05 % | |
| Other, total | ≤ 0.15 % | ≤ 0.15 % |
● Common requirements for 8021 flexible packaging aluminum foils have a flat sheet shape (less than 20Ⅰ);
●Uniform surface;
● Consistent thickness (3% tolerance);
● Good spreadability (less than three meters);
● clean surfaces;
● Fewer pinholes;
● Fewer and stronger joints (less than 20%);
● suitable mechanical properties.
