Patent ID: 6746517
Filing Date: 2004-06-08
Classification: B01D,D01F

Abstract:
A fine fiber filter media comprising a single layer of filter substrate, the substrate having a first surface and a second surface, the substrate having a permeability of about 0.03 to 15 m-secâˆ’1 and an efficiency greater than 10%, the first surface and the second surface each comprising a layer of fine fiber having a diameter of about 0.001 to 0.5 microns, the layer of fine fiber having a thickness of less than 5 microns, the layer of fine fiber formed in an amount effective to obtain a pore size of about 0.0001 to 5 microns, an overall efficiency under ASTM-1215-89 with monodisperse 0.78 micron polystyrene latex particles at 20 ft/min velocity of about 50% to 90% in any one layer and to obtain an efficiency of greater than 90% in the layers combined.