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Mixed Cellulose Ester Membranes
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Home | Membranes | Cellulose Membranes | Mixed Cellulose Ester Membranes
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 Whatman mixed cellulose ester membranes are composed of cellulose acetate and cellulose nitrate. These membranes are characterized by a smoother and more uniform surface than pure nitrocellulose filters. Also, the color contrast provided by the filter surface facilitates particle detection and minimizes eye fatigue. The ME range has a lower cellulose acetate content compared to the WME range of membranes.
Eased Counting Process
In microbiological colony counting procedures, the color contrast between the surface and the colonies facilitates the counting process.
Plain or Gridded
Many microbiological techniques include colony counting after incubation as the standard method of quantification. Whatman gridded filters have clearly defined grid lines spaced at 3.1 mm or 5 mm intervals. The special ink used is non-toxic and completely free from bacterial growth inhibitors.
Whatman black mixed cellulose esters are available plain for automatic colony counting applications, as well as gridded to assist in manual counting procedures. Black membranes provide contrast between residue or cell colors and the filter without having to counter-stain the membrane.
Sterile Filters
For those laboratories preferring to use membranes sterilized by autoclaving for microbiological work, Whatman provides black gridded membranes in packs with pads ready for laboratory autoclaving.
Features and Benefits
- Sterile options available for critical applications
- Excellent contrast for easier particle detection
- Grids are non-toxic and do not inhibit bacterial growth, ensuring sample integrity
- Black plain and black gridded membranes have a mix of cellulose nitrate and cellulose acetate
- The membrane offers a high degree of internal surface area for greater adsorption of product
- Higher dirt loading capacity
- Biologically inert with good thermal stability
- No surfactants to contaminate samples
- Uniform microporous structure of membrane gives high flow rates
- Thermally stable
Applications
The membrane is particularly effective in applications requiring higher flow rates and larger volume filtration including clarification or sterilization of aqueous solutions, particulate analysis and removal, air monitoring and microbial analysis. Other applications include:
- Clarification or sterilization of aqueous solutions
- Cytology
- Air monitoring
- HPLC samples (aqueous)
- Virus concentration
- Particulate analysis
- Biological assays
- Food microbiology including enumeration of E. coli in foods
- Bacteriological studies
- Particle counting from liquids and aerosols
- Yeasts and molds
| Typical Data - Mixed Cellulose Ester Membranes |
| Burst Strength |
>10 psi |
| Weight |
4.3-5.0 mg/cm2 |
| Maximum Service Temperature |
130° C |
| Porosity |
74-77% |
| Steam Autoclavable |
Yes |
| Solvent Resistancy |
Medium |
| Protein Binding |
Medium |
| Product Selection - Mixed Cellulose Ester Membranes |
| Pore Size (μm)(Membrane Type) |
Thickness (µm) |
Water Flow Rate
Δp = 0.9 bar (mL/min/cm2) |
Air Flow Rate
Δp = 3 mbar (mL/min/cm2) |
Bubble Point (bar) |
| WME Product Range |
140 |
- |
- |
- |
| ME Product Range |
| 0.2 (ME 24) |
135 |
24 |
- |
3.7 |
| 0.45 (ME 25) |
135 |
38 |
25 |
2.5 |
| 0.6 (ME 26) |
135 |
100 |
45 |
1.5 |
| 0.8 (ME 27) |
140 |
170 |
80 |
1.3 |
| 1.2 (ME 28) |
140 |
240 |
100 |
0.8 |
| 3 (ME 29) |
150 |
400 |
140 |
0.7 |
(Note: Autoclave pack contain 10 sealed envelopes. Each envelope contain 10 filters with 10 pads).
| Ordering Information - Mixed Cellulose Ester Membranes |
| Catalog Number |
Description |
Mixed Cellulose Ester (ME Range) - Plain
0.2 μm Pore Size (ME 24) |
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| 10401706 |
Mixed Cellulose Ester Circles (ME24), 0.2 µm, 25 mm 100/pk |
| 10401712 |
Mixed Cellulose Ester Circles (ME24), 0.2 µm, 47 mm 100/pk |
| 10401770 |
Mixed Cellulose Ester Circles (ME24), Sterile, 0.2 µm, 47 mm 100/pk |
| 10401714 |
Mixed Cellulose Ester Circles (ME24), 0.2 µm, 50 mm 100/pk |
| 10401772 |
Mixed Cellulose Ester Circles (ME24), Sterile, 0.2 µm, 50 mm 100/pk |
| 10401721 |
Mixed Cellulose Ester Circles (ME24), 0.2 µm, 100 mm 50/pk |
| 10401726 |
Mixed Cellulose Ester Circles (ME24), 0.2 µm, 110 mm 50/pk |
| 10401731 |
Mixed Cellulose Ester Circles (ME24), 0.2 µm, 142 mm 25/pk |
| 0.45 µm Pore Size (ME 25) |
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| 10401606 |
Mixed Cellulose Ester Circles (ME25), 0.45 µm, 25 mm 100/pk |
| 10401612 |
Mixed Cellulose Ester Circles (ME25), 0.45 µm, 47 mm 100/pk |
| 10401670 |
Mixed Cellulose Ester Circles (ME25), Sterile, 0.45 µm, 47 mm 100/pk |
| 10401614 |
Mixed Cellulose Ester Circles (ME25), 0.45 µm, 50 mm 100/pk |
| 10401662 |
Mixed Cellulose Ester Circles (ME25), without interleaving paper, 0.45 µm, 50mm 100/pk |
| 10401672 |
Mixed Cellulose Ester Circles (ME25), Sterile, 0.45 µm, 50 mm 100/pk |
| 10401618 |
Mixed Cellulose Ester Circles (ME25), 0.45 µm, 90 mm 50/pk |
| 10401621 |
Mixed Cellulose Ester Circles (ME25), 0.45 µm, 100 mm 50/pk |
| 10401626 |
Mixed Cellulose Ester Circles (ME25), 0.45 µm, 110 mm 50/pk |
| 10401631 |
Mixed Cellulose Ester Circles (ME25), 0.45 µm, 142 mm 25/pk |
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| 10401506 |
Mixed Cellulose Ester Circles (ME26), 0.6 µm, 25 mm 100/pk |
| 10401512 |
Mixed Cellulose Ester Circles (ME26), 0.6 µm, 47 mm 100/pk |
| 10401514 |
Mixed Cellulose Ester Circles (ME26), 0.6 µm, 50 mm 100/pk |
| 10401521 |
Mixed Cellulose Ester Circles (ME26), 0.6 µm, 100 mm 100/pk |
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| 10400906 |
Mixed Cellulose Ester Circles (ME 27), 0.8 µm, 25 mm 100/pk |
| 10400909 |
Mixed Cellulose Ester Circles (ME 27), 0.8 µm, 37 mm 100/pk |
| 10400912 |
Mixed Cellulose Ester Circles (ME 27), 0.8 µm, 47 mm 100/pk |
| 10400970 |
Mixed Cellulose Ester Circles (ME27), Sterile, 0.8 µm, 47 mm 100/pk |
| 10400914 |
Mixed Cellulose Ester Circles (ME 27), 0.8 µm, 50 mm 100/pk |
| 10400921 |
Mixed Cellulose Ester Circles (ME 27), 0.8 µm, 100 mm 50/pk |
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| 10400806 |
Mixed Cellulose Ester Circles (ME 28), 1.2 µm, 25 mm 100/pk |
| 10400812 |
Mixed Cellulose Ester Circles (ME 28), 1.2 µm, 47 mm 100/pk |
| 10400814 |
Mixed Cellulose Ester Circles (ME 28), 1.2 µm, 50 mm 100/pk |
| 10400821 |
Mixed Cellulose Ester Circles (ME 28), 1.2 µm, 100 mm 50/pk |
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| 10400706 |
Mixed Cellulose Ester Circles (ME 28), 3 µm, 25 mm 100/pk |
| 10400712 |
Mixed Cellulose Ester Circles (ME 28), 3 µm, 47 mm 100/pk |
| 10400714 |
Mixed Cellulose Ester Circles (ME 28), 3 µm, 50 mm 100/pk |
| 10400772 |
Mixed Cellulose Ester Circles (ME28), Sterile, 3 µm, 50 mm 100/pk |
Mixed Cellulose Ester Membranes (ME Range) - Gridded
0.2 μm Pore Size (ME24) |
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| 10406970 |
Mixed Cellulose Ester Circles (ME24), White/Black Grid 3.1 mm, Sterile 0.2 µm, 47 mm 100/pk |
| 10406914 |
Mixed Cellulose Ester Circles (ME24), White/Black Grid 3.1 mm, 0.2 µm, 50 mm 100/pk |
| 10406972 |
Mixed Cellulose Ester Circles (ME24), White/Black Grid 3.1 mm, Sterile, 0.2 µm, 50 mm 100/pk |
| 0.45 µm Pore Size (ME 25) |
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| 10406812 |
Mixed Cellulose Ester Circles (ME25), White/Black Grid 3.1 mm, 0.45 µm, 47 mm 100/pk |
| 10407970 |
Mixed Cellulose Ester Circles (ME25), White/Black Grid 3.1 mm, Sterile, 0.45 µm, 47 mm 100/pk |
| 10406871 |
Mixed Cellulose Ester Circles (ME25), White/Black Grid 3.1 mm, Sterile, 0.45 µm, 47 mm 1000/pk |
| 10406512 |
Mixed Cellulose Ester Circles (ME25), White/Black Grid 5 mm, 0.45 µm, 47 mm 100/pk |
| 10406570 |
Mixed Cellulose Ester Circles (ME25), White/Black Grid 5 mm, Sterile, 0.45 µm, 47 mm 100/pk |
| 10409712 |
Mixed Cellulose Ester Circles (ME25), Black/White Grid 3.1 mm, 0.45 µm, 47 mm 100/pk |
| 10409770 |
Mixed Cellulose Ester Circles (ME25), Black/White Grid 3.1 mm, Sterile, 0.45 µm, 47 mm 100/pk |
| 10409771 |
Mixed Cellulose Ester Circles (ME25), Black/White Grid 3.1 mm, Sterile, 0.45 µm, 47 mm 1000/pk |
| 10409414 |
Mixed Cellulose Ester Circles (ME25), Green/Black Grid 3.1 mm, 0.45 µm, 47 mm 1000/pk |
| 10409471 |
Mixed Cellulose Ester Circles (ME25), Green/Black Grid 3.1 mm, Sterile, 0.45 µm, 47 mm 1000/pk |
| 10406814 |
Mixed Cellulose Ester Circles (ME25), White/Black Grid 3.1 mm, 0.45 µm, 50 mm 100/pk |
| 10406862 |
Mixed Cellulose Ester Circles (ME25), White/Black Grid 3.1 mm, without interleaving paper, 0.45 µm, 50 mm 100/pk |
| 10406873 |
Mixed Cellulose Ester Circles (ME25), White/Black Grid 3.1 mm, Sterile, 0.45 µm, 50 mm 1000/pk |
| 10406514 |
Mixed Cellulose Ester Circles (ME25), White/Black Grid 5 mm, 0.45 µm, 50 mm 100/pk |
| 10406572 |
Mixed Cellulose Ester Circles (ME25), White/Black Grid 5 mm, Sterile, 0.45 µm, 50 mm 100/pk |
| 10406562 |
Mixed Cellulose Ester Circles (ME25), White/Black Grid 5 mm, without interleaving paper, 0.45 µm, 50 mm 100/pk |
| 10409714 |
Mixed Cellulose Ester Circles (ME25), Black/White Grid 3.1 mm, 0.45 µm, 50 mm 100/pk |
| 10409772 |
Mixed Cellulose Ester Circles (ME25), Black/White Grid 3.1 mm, Sterile, 0.45 µm, 50 mm 100/pk |
| 10409773 |
Mixed Cellulose Ester Circles(ME25), Black/White Grid 3.1 mm, Sterile, 0.45 µm, 50 mm 1000/pk |
| 10409462 |
Mixed Cellulose Ester Circles (ME25), Green/Black Grid 3.1 mm, without interleaving paper, Sterile, 0.45 µm, 50 mm 100/pk |
| 10409473 |
Mixed Cellulose Ester Circles (ME25), Green/Black Grid 3.1 mm, Sterile, 0.45 µm, 50 mm 1000/pk |
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| 10409814 |
Mixed Cellulose Ester Circles (ME26), Black/White Grid 3.1 mm, 0.6 µm, 50 mm 100/pk |
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| 10409970 |
Mixed Cellulose Ester Circles (ME25), White/Black Grid 3.1 mm, Sterile, 0.8 µm, 47 mm 100/pk |
Mixed Cellulose Ester Membranes (WME Range) - Gridded
0.2 μm Pore Size |
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| 7187-114 |
Mixed Cellulose Ester Circles (WME), White/Black Grid 3.1 mm, 0.2 µm, 47 mm 100/pk |
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| 7141-002 |
Mixed Cellulose Ester Circles (WME), White/Black Grid 3.1 mm, 0.45 µm, 25 mm 100/pk |
| 7141-004 |
Mixed Cellulose Ester Circles (WME), White/Black Grid 3.1 mm, 0.45 µm, 47 mm 100/pk |
| 7141-104 |
Mixed Cellulose Ester Circles (WME), White/Black Grid 3.1 mm, Sterile, 0.45 µm, 47 mm 100/pk |
| 7141-114 |
Mixed Cellulose Ester Circles (WME), White/Black Grid 3.1 mm, Sterile, without pad, 0.45 µm, 47 mm 100/pk |
| 7141-124 |
Mixed Cellulose Ester Circles (WME), White/Black Grid 3.1 mm, Sterile, 0.45 µm, 47 mm 200/pk |
| 7141-154 |
Mixed Cellulose Ester Circles (WME), White/Black Grid 3.1 mm, Sterile, without pad, 0.45 µm, 47 mm 1000/pk |
| 7141-204 |
Mixed Cellulose Ester Circles (WME), White/Black Grid 3.1 mm, Autoclave Pack, Sterile, 0.45 µm, 47 mm 100/pk |
| 7153-004 |
Mixed Cellulose Ester Circles (WME), Black/White Grid 3.1 mm, 0.45 µm, 47 mm 100/pk |
| 7153-104 |
Mixed Cellulose Ester Circles (WME), Black/White Grid 3.1 mm, Sterile, 0.45 µm, 47 mm 100/pk |
| 7155-004 |
Mixed Cellulose Ester Circles (WME), Green/Black Grid 3.1 mm, Sterile, 0.45 µm, 47 mm 100/pk |
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| 7148-002 |
Mixed Cellulose Ester Circles (WME), White/Black Grid 3.1 mm, 0.8 µm, 25 mm 100/pk |
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