... soft continous, high strength, wet strong resistance, good air permeability, without impurities,free-lint, strong adsorption, high degree ... to quantitative analysis and weight for analysis. 9. Air purification paperGood air permeability, can effectively prevent dust in the airBluish ... blue:82gsm 10. Goffered paper40gsm,42gsm,43gsm,45gsmGood air permeability,good absorbency of water, more than foreign ...