одноразовая маска пыль маска рм2,5 активировать угольный фильтр для взрослых pad рм2,5 нетканых ткани маски заменяемого layers для лица защи

disposable mask pad pm2.5 non-woven fabric mask-replaceable layers for face protective products 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.