фильтр рм2,5 круглая площадь одноразовая трехслойная non-woven air pad дышащий пылезащитные водонепроницаемая маски сек plxu

round square disposable three-layer non-woven air pad breathable dustproof waterproof mask s plxu features: 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.