2. Main technical specifications
A. Service life: Type40≥ 40min. Type 60≥ 60min poison gas and smoke protecting, fireproof, hot-radiation protecting, good sealing property, suitable for all kinds of adult faces.
B. Object of protection: Carbon monoxide. Hydrocyanic anid, poison smoke and fog.
C. Mist permeability coefficient< 5%
D. Inhalation resistance< 800Pa, Exhalation resistance< 300Pa