... caused, smooth fabric, good ventilation, suitable for powder filter. Polypropylene filament of the Company have over 80 varieties, ... depth, pore gradient and seamless construction. These seamless filter bags have exceptionally low tensile strength, and provide ... Needle Punched Felt, Mesh/Screen, Woven fabric, meltblow non-woven, thermal-calendering non-woven, filter papered. Filtration Precision: 0 ...