Material Parameter	AF6	AF15	AF26	AF35	AF50	AF60	AF90	ME.25	ME1	ME3	ME6
Nominal Pore Size (µ)	6	15	25	35	50	60	90	.25	1	3	6
Nominal Pore Volume (%)	45	45	45	45	45	45	45	45	45	45	45
Air Filtration (ε > 99% @ 50 ft/min))	.8 µ	2 µ	3 µ	4 µ	6 µ	8 µ	11 µ	.03 µ	.1 µ	.4 µ	.8 µ
Water Filtration (ε > 98%)	6 µ	15 µ	25 µ	35 µ	50 µ	60 µ	90 µ	.25 µ	1 µ	3 µ	6 µ
Air Permeability (psi/acfm/ft2)	.18	.06	.025	.02	.015	.012	.009	1.1	.12	.028	.015
Water Permeability (psi/gpm/ft2)	3.5	.5	.2	.15	.1	.09	.05	30	20	10	2
Relative Raw Material Price	$	$	$	$	$	$	$	$$$	$$$	$$$	$$$
MSDS	View	View	View	View	View	View	View	View	View	View	View

Description of Material Parameters

Pore Size

Pore Size is determined through Mercury Intrusion Porsimetry. Due to mercury's high surface energy, the mercury does not naturally enter to pores of the porous ceramic. A mercury intrusion porsimeter, however, applies a know amount of force onto the liquid mercury in order to infuse the mercury into the pores of the ceramic. Generally speaking, it takes more force to push the mercury into pores of smaller diameter. The mercury intrusion porsimeter measures and records the applied force and the amount of mercury infused into the ceramic's structure. Analytical analysis of the data creates a pore size distribution that is "bell" shaped in nature. The pore size value listed above represents the average pore size - but there are often times pore +/- 20% of this size within the porous plastic in lesser and lesser quantity as you travel away from the average.

Pore Volume

Pore Volume is determined through Mercury Intrusion Porsimetry testing. During this test, the sample's exterior (or envelop) volume is measured. Next, the volumetric amount of mercury introduced into the sample is record. The pore volume of the porous plastic is expressed as the ratio of air volume to plastic volume as a percentage. Therefore, a pore volume of 45% would describe a porous plastic article that was 55% plastic, and 45% void of plastic.

Filtration Efficiency

Air Filtration Efficiency describes a material's ability to capture particles of various sizes. This test involves the preparation of an upstream sample (also referred to as the influent sample) with a known concentration of particulate of know diameter. Typically, the upstream sample will be characterized by particle count data and particle size data. Next, the supply air is moved through the porous plastic. Many of the particles do not make their way through the porous plastic. As a result, there are fewer particles present in the down stream sample (also referred to as the effluent sample). The ratio of the number of particles of a specific particle size (diameter) in the influent versus the number of particles of a specific particle size (diameter) in the effluent can be expressed as a percentage. This percentage represents the penetration percentage. However, filtration efficiencies are typically expressed in terms of percent capture which is equal to one minus the penetration percentage.

Filtration efficiencies change with different flow rates. Flow rates are typically expressed in terms of "face velocity" which is calculated by dividing the volumetric flow rate by the size of the test sample. This yields a face velocity unit that is simply distance / unit time (for example, inches/sec., feet/minute, cm/sec., or m/sec.). Because of the fact that a material's filtration efficiency varies with changes in the face velocity of the influent stream, air filtration efficiency specs need to reference the test condition's face velocity, particle size, and capture efficiency. A typical format for filtration efficiency takes the following format: 99.9% efficient for particles with a diameter between .01 and .2 microns at a face velocity of 3 ft./min.

Air Permeability

Air Permeability describes the resistance that air incurs as it attempts to travels through a porous material. Materials with tight pore structure usually create more resistance to air flow than materials with more open or larger pore sizes. Air Permeability is typically expressed with three parameters: air flow rate, differential pressure, and time. Because air permeability is not linear with different face velocities, the proper specification of air permeability should include both differential pressure and face velocity values. In one scenario, the differential pressure can be held constant and the face velocity can be recorded (3 ft/min @ ΔP of 1.2" H2O). In a second scenario, the face velocity can be held constant and the differential pressure can be recorded (ΔP of 2.6" H2O @ face velocity of 3 ft/min). In yet a third scenario a Gurley number can be referenced. The Gurley number is equal to the amount of time (seconds) required for a known volume of air (~100 cc) to pass through a known area (~ one-square-inch) of porous material when a constant pressure is applied to the influent air stream (Gurley number of 23 sec.).

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ToolShare Tool Number	Sht-51-38-4 Sht-100-66-6 Sht-204-204-13 Sht-151-302-19 Sht-305-305-25 Sht-305-457-38 OD-13-13 OD-25-13 OD-48-6 OD-63-6 OD-101-13 OD-188-14 OD-233-19 OD-356-32 OD-508-51 TUB-13-8 TUB-25-16 TUB-38-25 TUB-64-28 TUB-64-44 TUB-108-76
X-Pore Material Number	AF6 AF15 AF25 AF35 AF50 AF60 AF90 ME.25 ME1 ME3 ME6
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