маска pad рм2,5 нетканые ткани маски заменяемые слоев для faprotective рм2,5 сменный фильтр-продукты

mask pad pm2.5 non-woven fabric mask-replaceable layers for faprotective products.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.