Structure | Filter rating (u) | Thickness (mm) | Weight (kg/ m2) | Porosity (%) |
Filter layer + 60 | 2-100 | 0.5 | 1.6 | 60 |
60 + Filter layer + 60 | 2-100 | 0.7 | 2.4 | 56 |
50 + Filter layer + 20 | 20-200 | 1.0 | 3.3 | 58 |
Filter layer + 20 + 8.5 | 20-250 | 2.0 | 6.5 | 58 |
60 + Filter layer + 40 + 20 | 20-200 | 1.0 | 4.4 | 44 |
40 + Filter layer + 20 + 16 | 20-200 | 1.7 | 6.2 | 54 |
30 + Filter layer + 60 + 20 + 16 | 20-200 | 1.9 | 5.3 | 52 |
80 + Filter layer + 30 + 10 + 8.5 | 20-200 | 2.5 | 8.8 | 55 |
50 + Filter layer + 40 + 20 + 40 + Filter layer + 50 | 20-100 | 2.0 | 7.4 | 58 |