Membrany z mieszaniny estrów celulozy, niesterylne - 0.45 µm
Filtry z mieszaniny estrów celulozy, krążki, kratkowane lub gładkie.
Mixed cellulose ester, WME range, circles, gridded

• Sterile options available for critical applications.
• Excellent contrast for easier particle detection.
• Grids are nontoxic 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.

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 quantitation. Whatman™ gridded filters have clearly defined grid lines spaced at 3.1 mm or 5 mm intervals. The special ink used is nontoxic 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.
Membrany z mieszaniny estrów celulozy, niesterylne - 0.45 µm
Membrany z mieszaniny estrów celulozy, niesterylne - 0.45 µm
Membrany z mieszaniny estrów celulozy, niesterylne - 0.45 µm
Application 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. 
Autoclavable Yes 
Material Mixed Cellulose Ester (MCE) 
Membrane Type ME 25 
Operating temp. max. 130°C
Pore Size 0.45 µm
Porosity Max. 77%
Porosity Min. 74%
Protein Binding Medium 
Solvent Resistance Medium 
Sterility Nonsterile 
Water Flow Rate (Delta p equals 0.9 bar) 12.5 s/100 ml/12.5 cm2
Weight Max. 5.0 mg/cm2
Weight Min. 4.3 mg/cm2
Product Product Name Grid color Diameter Grid dimension Interleaving paper
10401606 Mixed Cellulose Ester Circle ME Range (ME 25); plain; 0.45 µm pore size; 25 mm Plain 25 mm 3.1 mm Yes
10401612 Mixed Cellulose Ester Circle ME Range (ME 25); plain; 0.45 µm pore size; 47 mm Plain 47 mm 3.1 mm Yes
10401614 Mixed Cellulose Ester Circle ME Range (ME 25); plain; 0.45 µm pore size; 50 mm Plain 50 mm 3.1 mm Yes
10401618 Mixed Cellulose Ester Circle ME Range (ME 25); plain; 0.45 µm pore size; 90 mm Plain 90 mm 3.1 mm Yes
10401621 Mixed Cellulose Ester Circle ME Range (ME 25); plain; 0.45 µm pore size; 100 mm Plain 100 mm 3.1 mm Yes
10401626 Mixed Cellulose Ester Circle ME Range (ME 25); plain; 0.45 µm pore size; 110 mm Plain 110 mm 3.1 mm Yes
10401631 Mixed Cellulose Ester Circle ME Range (ME 25); plain; 0.45 µm pore size; 142 mm Plain 142 mm 3.1 mm Yes
10401662 Mixed Cellulose Ester Circle ME Range (ME 25); plain; without interleaving paper; 0.45 µm pore size; 50 mm Plain 50 mm 3.1 mm No
10401664 Mixed Cellulose Ester Circle ME Range (ME 25); plain; 0.45 µm pore size; 50 mm; low C Plain 50 mm 3.1 mm Yes
10406512 Mixed Cellulose Ester Circle ME Range (ME 25); white/black grid 5 mm; 0.45 µm pore size; 47 mm White/black 47 mm 5 mm Yes
10406812 Mixed Cellulose Ester Circle ME Range (ME 25); white/black grid 3.1 mm; 0.45 µm pore size; 47 mm White/black 47 mm 3.1 mm Yes
10406814 Mixed Cellulose Ester Circle ME Range (ME 25); white/black grid 3.1 mm; 0.45 µm pore size; 50 mm White/black 50 mm 3.1 mm Yes
10409414 Mixed Cellulose Ester Circle ME Range (ME 25); green/black grid 3.1 mm; 0.45 µm pore size; 47 mm Green/black 47 mm 3.1 mm Yes
10409714 Mixed Cellulose Ester Circle ME Range (ME 25); black/white grid 3.1 mm; 0.45 µm pore size; 50 mm Black/white 50 mm 3.1 mm Yes
7141-004 Mixed Cellulose Ester Circle WME Range; gridded; white/black grid 3.1 mm; 0.45 µm pore size; 47 mm White/black 47 mm 3.1 mm No
7141-204 Mixed Cellulose Ester Circle WME Range; gridded; white/black grid 3.1 mm; autoclave pack; 0.45 µm pore size; 47 mm Black 47 mm 3.1 mm Yes