Glass & Quartz Fiber Filters
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Overview
Specifications
Ordering Information
Documentation
References
| Reference overview | Application |
|---|---|
| Human hair: an unexpected source of cat allergen exposure. Liccardi G, Barber D, Russo M, D'Amato M, D'Amato G. Int Arch Allergy Immunol. 2005 Jun;137(2):141-4. Epub 2005 May 13. 2005 | Environmental Analysis |
FAQ
| Question | Answer |
|---|---|
| Which filter do you recommend for EPA Method 1311 (TCLP)? | The filters cited by the EPA in the TCLP ("Toxicity Characteristic Leaching Procedure") Method are our AP40 filters. These filters are made of glass fiber and contain no resin binders that could contaminate your analysis. If you are testing for volatiles your filter holder will usually take a 90mm diameter filter (Catalog # AP4009000). If you are testing for non-volatiles, semi-volatiles or metals your filter holder will usually take a 142mm diameter filter (Catalog # AP4014250). |
| What is the difference between pore size and pore size distribution? | Whereas pore size is a measure of the diameter of the largest pore, pore size distribution is a measure of the range of pore sizes. The range of pore sizes can be normally distributed, and the spread can be quite narrow (e.g. the ratio of largest to smallest may be less than 2). On the other hand, pore size distribution can be very heterogeneous. In the case of large spreads and heterogeneity, the pore size will be far less predictive of flow rate (either filtration or capillary) than it will be for a membrane with a narrow pore size distribution. It is important to note that the pore size corresponding to the bubble point is not at the middle of the distribution, but is the largest pore. |
Related Products & Applications
Related Products By: Application Facete
| Dialysis and Filtration |
Categories
| Reagents, Chemicals and Labware > Lab Filtration > Filter Discs and Membranes |
Millipore fibrous disc filters are available in a wide range of flow rates and throughput capacities. Glass fiber filters are available with or without binder resins and can be sterilized by EO, gamma, or autoclave (121 °C at 1 bar).
Glass Fiber Filters with Binder Resin
Millipore filters with binder resin have superior wet strength and are excellent for qualitative analysis and prefiltration, especially for heavily contaminated liquids. They are also widely used for clarification of aqueous solutions.
Type AP15
- Lowest dirt-holding capacity
- Recommended prefilter for 0.2 to 0.6 µm filters
Type AP20
- Lower retention, higher dirt-holding capacity than AP15 filters
- Recommended prefilter for 0.8 to 8.0 µm filters
- Use upstream to protect type AP15 filters
Type AP25
- Added thickness yields same retention and greater dirt-holding capacity as AP20
- Recommended prefilter for 0.9 to 8 µm filters, especially for proteinaceous and heavily contaminated liquids
- Use upstream to protect type AP15 filters
Glass Fiber Filters without Binder Resin
The filters without binder resin retain their structural integrity without weight loss when heated up to 500 °C and can therefore be used in gravimetric analysis as well as for the filtration of hot gases.
Type APFA
- Retains fine particles with good efficiency, even at high flow rates
- Recommended for monitoring wastewater and collecting suspended particles in gases (e.g., fumes from chimneys)
- Use in biochemical applications (e.g., collection of cells and filtration of protein or nucleic acid precipitates)
Type APFB
- Higher mechanical strength when wet and greater loading capacity than type APFA filters
- Use for liquid clarification, quantification of solids in suspensions of fine particles, and scintillation counting
Type APFC
- Greater retention, especially for fine particulate and microorganism removal than type APFA filters
- Use for determining total suspended solids in drinking water
- Use for filtering proteins or nucleic acid TCA precipitates and for collecting cells and microorganisms
Type APFD
- Thick filter with high flow and low retention
- Use for clarifying suspensions containing particulates > 1.0 µm
Type APFF
- Use for filtering extremely fine precipitates such as protein, nucleic acids, or serum precipitates
- Recommended for USEPA method 1311 for TCLP analysis
Type AP40
- Recommended for Standard Methods Total Suspended Solids 2540D
- Recommended for USEPA method 1311 for TCLP analysis
- Maintains structural integrity without weight loss when ignited to 550 °C (1022 °F) after sample filtration
- Recommended for determining volatile suspended matter in wastewater and industrial effluents
Quartz Fiber Filters (Type AQFA)
Made of very pure quartz fibers with no glass fibers or binders. The pure quartz composition prevents the filters from reacting with acidic gases, unlike glass fiber filters that can react and cause false readings. This makes quartz filters well suited for measuring heavy metal concentrations and small amounts of particles (such as the USEPA PM 10 ambient air monitoring method). The filters also exhibit good weight and form
stability.
Glass fiber disc filters are available in a wide range of flow rates and throughput capacities. Glass fiber filters are available with or without binder resins and can be sterilized by ethylene oxide, gamma irradiation or autoclaving.
Our pure quartz fiber filters have a composition that prevents the filters from reacting with acidic gases. This makes quartz filters well-suited for measuring heavy metal concentrations and small amounts of particles (such as the US EPA PM 10 ambient air monitoring method).
| Specifications | |||||||||
| Filter Code1 | Retention Rating (µm) |
Thickness (µm) |
Water Flow Rate (mL/min/cm2) |
Air Resistance2 (mm of H2O) |
Air Flow3 (L/min/cm2) | DOP Penetration4 | Protein Binding (µg/cm2) |
Weight (g/m2) |
Max. Temp. (°C) |
| Glass Fiber Filters with Binder Resin | |||||||||
| AP15 | 0.2 - 0.6 | 790 | 1.6 | 210 | 10.6 | 0.10 | 100 | 50 | – |
| AP20 | 0.8 - 8.0 | 380 | 1.3 | 48 | 46.4 | 0.08 | 60 | 59 | – |
| AP25 | 0.8 - 8.0 | 1200 | 5.8 | 35 | 63.6 | 0.03 | 110 | 140 | – |
| Glass Fiber Filters without Binder Resin | |||||||||
| APFA | 1.6 | 230 | 5.0 | 33 | 67.5 | 0.002 | – | 55 | 500 |
| APFB | 1.0 | 700 | 2.2 | 95 | 23.4 | 0.002 | – | 140 | 500 |
| APFC | 1.2 | 240 | 1.2 | 54 | 41.2 | 0.002 | – | 52 | 500 |
| APFD | 2.7 | 470 | 2.7 | 16 | 139 | 0.1 | – | 120 | 500 |
| APFF | 0.7 | 380 | 1.4 | 120 | 18.6 | 0.002 | – | 75 | 500 |
| AP40 | – | 475 | 6.0 | 50 | 44.5 | 0.002 | – | 65 | 550 |
| Quartz Fiber Filters | |||||||||
| AQFA | – | 430 | 1.6 | 50 | 44.5 | 0.002 | – | 85 | 950 |
| 1Corresponds to first 4 digits of catalogue number 2Measured at 10.5 fpm or 5.3 cm/s 3Meaured at 10 psi 4Dioctyl phthalate percentage at 10.5 fpm |
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