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Main -> Separating systems -> Filtration -> Membrane filters |
Membrane Filters, Hahnemühle |
1 Cellulose acetate membrane filters
Recommended for aqueous samples, biological applications and protein filtration. - Made entirely from pure cellulose acetate, hydrophilic, high flow rate
- High thermal stability, maximum temperature 180ºC
- Suited for use in pressure filtration devices
- Resistant to aqueous solutions with pH 4 – 8, most alcohols, hydrocarbons and oils
- Sterilization: by autoclaving at 121ºC or 134ºC, with γ-radiation, dry heat or ethylene oxide
2 Cellulose nitrate membrane filters
Recommended for clarification and sterilization of aqueous solution, microbiological analysis and particle counts. - Hydrophilic, very high flow rate
- High non-specific adsorption: 160 µg/cm2 for γ-globulin (decreases with increasing pore size)
- Resistant to aqueous solutions (pH 4 – 8), hydrocarbons and some dilute solvents
- Extractables with water less than 1%
- Sterilization: by autoclaving at 121ºC, γ-radiation (25 kGy) or with ethylene oxide
| Pore size µm | Ø mm | Version | Order No. | PU pc/Pack | |
| 0.2 | 50 | non sterile, white | 10 15 93039 | 100 | |
| 0.45 | 25 | non sterile, white, gridded | 10 15 93041 | 100 | |
| 0.45 | 47 | non sterile, white, gridded | 10 15 93042 | 100 | |
| 0.45 | 47 | non sterile, white | 10 15 93043 | 100 | |
| 0.45 | 50 | non sterile, white | 10 15 93050 | 100 | |
| 0.8 | 47 | non sterile, white | 10 15 93051 | 100 | |
| 3.0 | 47 | non sterile, white | 10 15 93044 | 100 | |
| 5.0 | 47 | non sterile, white | 10 15 93045 | 100 | |
| 0.2 | 47 | sterile, white, gridded | 10 15 93046 | 100 | |
| 0.45 | 47 | sterile, white, gridded | 10 15 93047 | 100 | |
| 0.45 | 47 | sterile, white | 10 15 93048 | 100 | |
| 0.45 | 47 | sterile, black, gridded | 10 15 93049 | 100 | |
Mixed cellulose ester membrane filter
Recommended for clarification and sterilisation of aqueous solutions, microbiological analysis and particle counts. - Made of a blend of cellulose nitrate and cellulose acetate, hydrophilic
- High flow rate
- High non-specific adsorption
- Qualified for aqueous solutions (pH 4-8), hydrocarbons and some dilute solvents
- High mechanical stability, robust to handle
- Ideal for gravimetrical measurements
Nylon membrane filters
Recommended for filtration, sterilisation and clarifications of mobile phase in HPLC processes and with aqueous, alkaline and organic samples. - Made entirely of polyamide, hydrophilic, white
- Resistant to many solvents and alkali-solutions, pH range 3 – 14
- High non-specific adsorption
- Adsorption: BSA 100 µg/cm2 (for 0.2 µm pore size)
- Extractables with water less than 1%
- Sterilization by autoclaving at 121ºC, γ-radiation (25 kGy) or with ethylene oxide
3 Polycarbonate membrane filters
Recommended for electron microscopy analysis due to its homogeneous translucence and plain surface. - Made of high grade polycarbonate film, hydrophilic
- Track-etched manufacturing method
- High chemical and heat stability
- High translucency, no auto-fluorescence as background
- Low non-specific adsorption: <5 µg/cm² with BSA
- Extractable with water less than 1%
- Sterilization: by autoclaving at 121ºC or 134ºC, γ-radiation or ethylene oxide
4 Accessories for filtration with membranes
Ready-to-use monitors for colony counting. For microbiological testing of pharmaceuticals, cosmetics, food, beverages, water and other liquids. - With a gridded cellulose nitrate membrane filter (47 mm) and cellulose pad
- Ready to use – can be adapted to multi-branch by adapter
- After filtration and removal of the scaled 100 ml funnel, the monitor can be used as a petri dish with magnifying glass in the lid
- Now, simply soak the membrane and filter cardboard in it with the culture medium of your choice to prepare them for incubation
- Perfect for routine analyses with high sample volumes: saves time and money!
- Available with black or white gridded membrane
- Monitors with cellulose nitrate membranes assure effective retention with high flow rates and optimum
- Available as sterile filter and individually packaged
| Pore size µm | Ø mm | Version | Order No. | PU pc/Pack | |
| 0.45 | 47 | white, sterile, gridded | 10 15 97021 | 50 | |
| 0.45 | 47 | black, sterile, gridded | 10 15 97022 | 50 | |
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