... technology, develop the appliance of filter bag to high grade.Stitching :We sew the filter bag strictly. Our filter bag is durable .Pure sewing ... as follow: Polypropylene :Acid and alkali resistance, temperature is 90°C,non-woven fabric, filter range is 0.5-600μm.Polyester ... : Alkali resistance, solvent resistance, temperature is 160°C,non-woven fabric, filter range is 0.5-600μm.Screen ...