Gas Mask 1. Resist CLCN Time: more than 30min (30L/Min, 1.5mg/L, relative humidity 80%) 2 Aspiratory resistance: ≤196Pa (30L/min) 3. Eepiratory resistance: ≤100Pa (30L/min) 4. Visual Field: Total visual field: ≥75% Binocular visual field: ≥30% 5. Transmission rate of oil mist: ≤0.005%