The type has two parts: Mask body of NDSM2002-M equipped with one canister used in the chemical industry.Length of gas-guide tube is about 5m,10m,15m,20m,0.5m,1m. 1. APPLICATION AND FEATURE when the ambient air is contaminated with chemical biological and radiated agents, the mask can provide effective protection to the wearer’s respiratory organs, eyes and facial skin. The mask is designed for use by military, police and civil defense and can also be used in industry, agriculture, warehouse, scientific research etc. The flexibility of the mask body is suitable. The elastic straps have elasticity and can be adjusted at random to ensure a comfortable, leak-free fit. Large triangular lenses are manufactured from optical plastic with its surface treated specially. The lenses provide a wide visual field and excellent optical properties and have good abrasion and shook resistance. The canister is filled with impregnated carbon of good quality and high efficiency filter paper and high efficiency filter paper and can filter out toxic gases and particulate aerosol from the influent air except carbon monoxide. The canister has a low resistance, lightweight and long life. 2.SPECIFICATION: Cyanogens chloride: not less than 50 minutes at 30 L/min. 1. 5mg/L, 80-80% RH conditions. Hydrocyanic acid: not less than 50 minutes at 30L/min,3mg/L conditions. 2. Oil mist penetration coefficient: not more than 0.005% at 30L/min 3. Inhalation resistance: not more than 186 pa at 30L/min. 4. Exhalation resistance: not more than 100 pa at 30L/min. 5. Visual field: total ≮ 75°, binocular visual field ≮60°, Below visual field≮40° 6. Storage life: more than 5 years.