... caused, smooth fabric, good ventilation, suitable for powder filter. Polypropylene filament of the Company have over 80 varieties, ... that are 99% efficient. This filter bag is a hybrid design, combining features of filter cartridges and regualr filter bags. The result ... fabric, meltblow non-woven, thermal-calendering non-woven, filter papered. Filtration Precision: 0.5 micron to 300 micron Seamless ...