Flash-spun sheet material

摘要

This invention relates to improved sheets of flash-spun plexifilamentary film-fibrils useful in fluid microfiltration and sterile packaging. The above and other properties of the present invention are achieved by a sheet material suitable for use in microfiltration of liquids having a permeability that causes a pressure drop of less than 4 psid at a flow rate of 10 gal/hr, and that has a filtration efficiency of 99% of dust particulates in the size range of 1 to 2 microns at a pressure differential of 30 psid. The invention also relates to a sheet material suitable for use in sterile packaging that has a Gurley Hill Porosity of less than 15 seconds and a spore log reduction value of at least 2.5.