Patent ID: 8262780
Filing Date: 2012-09-11
Classification: B01D,B32B,F02C

Abstract:
1. A composite filter media structure including: a base substrate including a nonwoven fabric substrate formed from a plurality of bicomponent synthetic fibers using a spunbond process; a surface layer deposited on one side of the base substrate wherein the surface layer is formed from a microporous expanded polytetrafluoroethylene membrane; the base substrate and the surface layer are configured to provide greater than 95% and equal to or less than 99.5% filtration efficiency measured in accordance with an EN 1822 test method, and the composite filter media structure provides the greater than 95% and equal to or less than 99.5% fractional efficiency at pressure drops between approximately 0.60 inches of water and 3.05 inches of water.