Product Description
Product Description
PM 2.5 Air Monitoring Membrane Filters Description
Whatman PTFE membranes are chemically stable and inert. They are suitable for applications involving aggressive organic solvents, strong acids, and alkalis. PTFE membranes are particularly suitable for preparing samples for HPLC analysis. The hydrophobic nature of the membrane also has applications for air and gas sterilization. The membrane is laminated onto a nonwoven polypropylene support web for improved strength and handling and can be used at temperatures up to 120ºC.
PM 2.5 Air Monitoring Membrane Filters Chemically stable and inert
PTFE is the membrane of choice for use with aggressive solvents, liquids, and gases that can attack other membranes. It is resistant to most acids, alkalis, and solvents.
PM 2.5 Air Monitoring Membrane Filters Application
One of the major applications for the PTFE membrane is the clarification of corrosives, solvents, and aggressive fluids. This includes the important requirement in HPLC analysis for sample filtration where any solid particles can cause permanent damage to the column. The 0.5 μm pore size is normally used. Air and gas filtration use the hydrophobic characteristics of PTFE membranes and their ability to stop aqueous aerosols. Usual pore sizes are 0.2 μm and 0.5 μm. Venting of vacuum manifolds, fermentation vessels, and sterile filtrate tanks and containers utilize PTFE 0.2 μm membranes.
PM 2.5 Air Monitoring Membrane Filters
Whatman PM 2.5 Ambient Air Monitoring Filters are composed of 2.0um PTFE membranes with a 46.2mm diameter, combined with a Polypropylene support ring ideal for robotic air sampling. Their thermally-stable design and natural chemical resistance make them suitable to withstand environmental pollutants that may contain an array of contaminants, yet still deliver clear and precise results. The Polypropylene support ring assures a flat membrane that does not curl, and makes the Filter very user-friendly. These Filters feature a low tare mass for accurate gravimetric determinations. They meet the requirements for EPA FRM PM 2.5 under 40 CFR Part 50, Appendix L and come sequentially-numbered.
40 CFR Part 50, Appendix L
40 CFR Part 50, Appendix L calls for a Filter paper that meets listed parameters in section 6.0. The below table reflects the criteria that each lot of Tisch Scientific SF18040 PM2.5 Ambient Air Monitoring Filters are tested against for quality assurance, next to this criteria is the referenced section number from 40 CFR Part 50, Appendix L that calls for these parameters.
Criteria
| 7592-104 Characteristic
| Range/Test Method
| 40 CFR Part 50, Appendix L Section
|
Filter Media
| PTFE Teflon
| N/A
| 6.2
|
Filter Thickness
| 40 µm
| ±10
| 6.5
|
Filter Diameter
| 46.2 mm
| ±0.25
| 6.1
|
Filter Pore Size
| 2 µm
| ASTM F 316-94
| 6.4
|
Total Support Ring Thickness
| 0.38 mm
| ±0.04
| 6.3
|
Support Ring – Width
| 3.68 mm
| ±0.00, -0.51
| 6.3
|
Particle Retention (0.3 µm)
| 99.7%
| ASTM D 2986-95a
| 6.8
|
Pressure Drop (0.3 µm) @ 16.67 liters/min.
| 30 cm H2O
| ASTM D 2986-95a
| 6.6
|
Alkalinity
| 25 u eq/g of Filter
| EPA/600-R-94/038b,Section 2.12
| 6.10
|
Weight Loss
| <20 ug
| Above
| 6.9
|
Loose Particles
| <20 ug
| Above
| 6.9.1
|
Moisture Pickup
| <10 ug
| Above
| 6.7
|
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