Patent ID: 8951420
Filing Date: 2015-02-10
Classification: B01D,Y10T

Abstract:
1. A filter media comprising: a first layer comprising glass fibers, the fibers in the first layer having a first average diameter; a second layer adjacent the first layer comprising glass fibers, the fibers in the second layer having a second average diameter; and a third layer adjacent the second layer comprising glass fibers, the fibers in the third layer having a third average diameter, wherein at least one of the first and second layers includes at least 70 wt % glass fibers, wherein each of the first and second layers has a thickness between about 3 mils and 100 mils, wherein the first and second layers have a combined basis weight of less than 200 g/m wherein the filter media has a thickness of between about 5 mils and about 300 mils, wherein the filter media has an absolute specific capacity at 10 microns of greater than about 2.5, wherein the absolute specific capacity at 10 microns is calculated by multiplying the dirt holding capacity of the media by the square root of the log of the Beta(x) value for 10 micron and larger particles, and dividing by an overall basis weight of the media, and wherein the Beta(x) value is measured using a Multipass Filter Test following the ISO 16889 procedure, which involves use of a hydraulic test fluid, a dust level of 10 mg/liter and a face velocity of 0.14 meters/min until a terminal pressure of 172 kPa above a baseline filter pressure drop is obtained.