Coalescer filter media
Filter media are generally described. In some embodiments, a filter media has one or more properties that enhance its suitability for use in coalescer filters. For instance, the filter media may have a particularly low pressure drop and/or may have a particularly high efficiency. In some instances, such properties may be obtained without the inclusion of fluorinated materials, government-regulated substances, and/or toxic substances (e.g., PFAS) in the filter media or with the inclusion of no more than de minimis amounts of such substances.
1 . A filter media, comprising:
a fiber web, comprising glass fibers and a resin, wherein:
the fiber web has a coalescer gamma value of less than or equal to 30,
the fiber web has a basis weight of greater than or equal to 130 gsm, and
the fiber web is oleophilic.
2 . A filter media, comprising:
a fiber web, comprising glass fibers, wherein:
the fiber web has a basis weight of greater than or equal to 130 gsm,
the fiber web comprises pores,
pores having a diameter of less than 1.25 microns make up less than or equal to 30% of the pores,
pores having a diameter of greater than or equal to 1.25 microns and less than 2.5 microns make up greater than or equal to 40% of the pores, and
a ratio of a number of pores having a diameter of less than 1.25 microns to a number of pores having a diameter of greater than or equal to 1.25 microns and less than 2.5 microns is less than or equal to 1.
3 . A filter media as in claim 1 , wherein the fiber web is a non-woven fiber web.
4 . A filter media as in claim 1 , wherein the fiber web is wet laid.
5 . A filter media as in claim 1 , wherein the resin is oleophilic.
6 . A filter media as in claim 1 , wherein the resin is hydrophilic.
7 . A filter media as in claim 1 , wherein the resin is hydrophobic.
8 . A filter media as in claim 1 , wherein the fiber web comprises microglass fibers.
9 . A filter media as in claim 1 , wherein the glass fibers have an average diameter of greater than or equal to 0.2 microns and less than or equal to 6 microns.
10 . A filter media as in claim 1 , wherein the fiber web comprises synthetic fibers.
11 . A filter media as in claim 1 , wherein the fiber web comprises fibrillated fibers.
12 . A filter media as in claim 1 , wherein the filter media comprises binder fibers.
13 . A filter media as in claim 1 , wherein the basis weight of the fiber web is greater than or equal to 150 gsm and less than or equal to 400 gsm.
14 . A filter media as in claim 1 , wherein the fiber web has an air permeability of greater than or equal to 5 L/(m 2 ·s) and less than or equal to 400 L/(m 2 ·s).
15 . A filter media as in claim 1 , wherein the fiber web has a thickness of greater than or equal to 0.1 mm and less than or equal to 5 mm.
16 . A filter media as in claim 1 , wherein the fiber web has a mean flow pore size of greater than or equal to 0.5 microns and less than or equal to 15 microns.
17 . A filter media as in claim 1 , wherein the filter media further comprises an additional layer.
18 . A coalescer filter element comprising the filter media of claim 1 .
19 . A method comprising passing a fluid through the filter media of claim 1 .
20 . A method as in claim 19 , wherein the fluid comprises a gas and comprises oil.