5 слой защитная маска рм2,5 pad фильтра рм2,5 fareplacement pad mask внутренняя панель прокладок замена колодки маска

5 layer protective pm2.5 mask pad fareplacement pad mask inner pad gasket replacement pads mask.1.the first layer: high efficient filter cloth filter the dust of micron.2.the second layer: meltblown cloth to filter industrial pollutants, automobile exhaust, second-hand smoke pollen allergies.3.the third layer: high efficient filter cloth filter benzene and a smaller function of filtering dust microns.4.the fourth layer: activated carbon cloth filter density, sma.