PTFE pleated filter element
View Patent ↗A filter media including a scrim, a polytetrafluoroethylene (PTFE) media substrate upon the scrim, and a layer of expanded polytetrafluoroethylene (ePTFE) membrane adhered to the PTFE media substrate on the scrim. The filter media is pleatable and has air permeability of approximately 3-10 cubic feet/min at a 0.5 inch H2O pressure drop and an original filtration efficiency greater than 99.0% when tested in an unused, unpleated condition with a 0.3 micron challenge aerosol at a flow rate of 10.5 feet/min and when tested after a cleanable dust performance test according to ASTM D6830.
1. A filter media including:
a scrim;
a polytetrafluoroethylene (PTFE) media substrate upon the scrim; and
a layer of expanded polytetrafluoroethylene (ePTFE) membrane adhered to the PTFE media substrate on the scrim;
the filter media is pleated to have a plurality of pleats and has air permeability of approximately 3-10 cubic feet/min at a 0.5 inch H 2 O pressure drop and an original filtration efficiency greater than 99.0% when tested in an unused, unpleated condition with a 0.3 micron challenge aerosol at a flow rate of 10.5 feet/min and when tested after a cleanable dust performance test according to ASTM D6830 in an unused, unpleated condition.
2. A filter media as set forth in claim 1 , further including a stiffening agent including of a polyimide adapted for treating the polytetrafluoroethylene (PTFE) media substrate.
3. A filter media as set forth in claim 2 , wherein the stiffening agent includes polyamideimides (PAI).
4. A filter media as set forth in claim 3 , further including a fluoropolymer (FP) resin adapted for treating the polytetrafluoroethylene (PTFE) media substrate.
5. A filter media as set forth in claim 4 , wherein the polytetrafluoroethylene (PTFE) media substrate is thermally laminated to the layer of expanded polytetrafluoroethylene (ePTFE) membrane.
6. A filter media as set forth in claim 1 , wherein the scrim is metal.
7. A filter media as set forth in claim 6 , further including a fluoropolymer (FP) resin adapted for treating the polytetrafluoroethylene (PTFE) media substrate.
8. A filter media as set forth in claim 7 , wherein the polytetrafluoroethylene (PTFE) media substrate is thermally laminated to the layer of expanded polytetrafluoroethylene (ePTFE) membrane.