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Classification | Area Density | Thickness | Peak Pressure | Spalling Protection |
---|---|---|---|---|
ER1 | 20 kg/m² | 11 mm | max. overpressure 50 ≤ Pr < 100 kPa | Yes |
ER2 | 32 kg/m² | 21 mm | max. overpressure 100 ≤ Pr < 150 kPa | Yes |
ER3 | 41 kg/m² | 27 mm | max. overpressure 150 ≤ Pr < 200 kPa | Yes |
ER4 | 52 kg/m² | 34 mm | max. overpressure 200 ≤ Pr < 250 kPa | Yes |
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