маска pad маски сердечник номер расплав спрей ткань нетканые ткани трехслойной 3d маска вставить фильтр рм2,5 пылезащитно

mask pad mask core non melt spray cloth non-woven cloth three-layer 3d mask paste dust-proof.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.