Membrany z mieszaniny estrów celulozy, sterylne -1.2 µm

Filtry z mieszaniny estrów celulozy, krążki, kratkowane.
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, sterylne -1.2 µm
Air Flow Rate (Delta p equals 3 mbar) 6.7 s/100 ml 
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 
Diameter 50 mm
Grid Color Green/black 
Grid Dimension 3.1 mm
Interleaving Paper Yes 
Material Mixed Cellulose Ester (MCE) 
Membrane Type ME 28 
Operating temp. max. 130°C
Pore Size 1.2 µm
Porosity Max. 77%
Porosity Min. 74%
Protein Binding Medium 
Solvent Resistance Medium 
Sterility Sterile 
Water Flow Rate (Delta p equals 0.9 bar) 1.2 s/100 ml/12.5 cm2
Weight Max. 5.0 mg/cm2
Weight Min. 4.3 mg/cm2
With Pad No 
Product Product Name Pack size
10408472 Mixed Cellulose Ester Circle ME Range (ME 28); green/black grid 3.1 mm; sterile; 1.2 µm pore size; 50 mm 100 pieces
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