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Grade | Mass per UnitArea (g/m2) | Thickness (mm) | Air Permeability L/m²·s | Dry Bursting Strength (kPa≥) | Wet Bursting Strength (kPa≥) | color |
HV250K | 240-260 | 0.8-0.95 | 100-120 | 160 | 40 | white |
HV250 | 235-250 | 0.8-0.95 | 80-100 | 160 | 40 | white |
HV300 | 290-310 | 1.0-1.2 | 30-50 | 130 | ~ | white |
HV109 | 345-355 | 1.0-1.2 | 25-35 | 200 | ~ | white |











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