... 4) Protect against dust. mining dust maskFeatures of mining dust maskNon-woven fabric: Pp non-woven, carbon, filter and needle punched ... high filtration efficiency.Filtering and adsorbing harmful industrial dust, it can prevent silicosis.Adjustable contoured aluminum nosepiece ... It's very convenient and practical.Applications of minning dust maskRubber, synthetic fur, metal casting, battery, building ...