Membrane , CN, White Gridded, 0.8µm 25mm 100/pk, ยี่ห้อ Whatman

รหัสสินค้า : 7148-002

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.

Air Flow Rate (Delta p equals 3 mbar) : 11.6 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 

Grid Dimension : 3.1 mm

Interleaving Paper : Yes 

Material : Mixed Cellulose Ester (MCE) 

Membrane Type : ME 27 

Operating temp. max. : 130°C °C

Pore Size : 0.8 µm

Porosity Max. : 77% 

Porosity Min. : 74% 

Protein Binding : Medium 

Solvent Resistance : Medium 

Sterility : Nonsterile 

Water Flow Rate (Delta p equals 0.9 bar) : 2.8 s/100 ml/12.5 cm² 

Weight Max. : 5.0 mg/cm² 

Weight Min. : 4.3 mg/cm² 

Diameter : 25 mm 

Grid Color : Plain