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Whatman™ Cellulose Ester Membranes Cytiva

Productdata

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.

Features and benefits

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
Thermally stable
Type STL in dispenser boxes with 100 numbered membrane filters for easy removal and safe handling with the Membrane-Butler (supplied in 4 boxes each with 100 membrane filters)

ST: single sterile packed
STL: sterile, for use with Whatman Membrane-Butler

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

Bursting pressure: > 0,7 bar
Weight: 4,3 - 5,0 mg/cm2
Operating Temp. Max.: 130°C
Porosity: 74 - 77 %
Protein Binding: Medium
Solvent Resistance: Medium

Type WME
Thickness: 140 µm

Type ME 24
Thickness: 135 µm
Water flow rate 0,9 bar: 25 ml/min/cm2
Bubble Point: 3,7 bar

Type ME 25
Thickeness: 135 µm
Water flow rate 0,9 bar: 45 ml/min/cm2
Water flow rate 3 mbar: 25 ml/min/cm2
Bubble Point: 2,5 bar

Type ME 26
Thickness: 135 µm
Water flow rate 0,9 bar: 110 ml/min/cm2
Water flow rate 3 mbar: 45 ml/min/cm2
Bubble Point: 1,5 bar

Type ME 27
Thickness: 140 µm
Water flow rate 0,9 bar: 170 ml/min/cm2
Water flow rate 3 mbar: 80 ml/min/cm2
Bubble Point: 1,3 bar

Type ME 28
Thickness: 140 µm
Water flow rate 0,9 bar: 240 ml/min/cm2
Water flow rate 3 mbar: 100 ml/min/cm2
Bubble Point: 0,8 bar

Type ME 29
Thickness: 150 µm
Water flow rate 0,9 bar: 400 ml/min/cm2
Water flow rate 3 mbar: 140 ml/min/cm2
Bubble Point: 0,7 bar

Added to your shopping cart

Item No.	type no.	diameter	pore size		Price	Stock	Amount
Item No.	12.4007.01	type no.	ME 29 white	diameter	25 mm	pore size	3 µm	Price	CHF 171.00	Stock	Amount	pack à 100 piece
Item No.	12.4007.02	type no.	ME 29 white	diameter	47 mm	pore size	3 µm	Price	CHF 225.90	Stock	Amount	pack à 100 piece
Item No.	12.4007.03	type no.	ME 29 white	diameter	50 mm	pore size	3 µm	Price	CHF 233.40	Stock	Amount	pack à 100 piece
Item No.	12.4007.04	type no.	ME 29 white	diameter	50 mm	pore size	3 µm	Price	CHF 260.35	Stock	Amount	pack à 100 piece
Item No.	12.4008.01	type no.	ME 28 white	diameter	25 mm	pore size	1.2 µm	Price	CHF 171.00	Stock	Amount	pack à 100 piece
Item No.	12.4008.02	type no.	ME 28 white	diameter	47 mm	pore size	1.2 µm	Price	CHF 225.90	Stock	Amount	pack à 100 piece
Item No.	12.4008.03	type no.	ME 28 white	diameter	50 mm	pore size	1.2 µm	Price	CHF 233.40	Stock	Amount	pack à 100 piece
Item No.	12.4008.04	type no.	ME 28 white	diameter	100 mm	pore size	1.2 µm	Price	CHF 627.90	Stock	Amount	pack à 50 piece
Item No.	12.4009.01	type no.	ME 27 white	diameter	25 mm	pore size	0.8 µm	Price	CHF 140.85	Stock	Amount	pack à 100 piece
Item No.	12.4009.02	type no.	ME 27 white	diameter	37 mm	pore size	0.8 µm	Price	CHF 190.55	Stock	Amount	pack à 100 piece
Item No.	12.4009.03	type no.	ME 27 white	diameter	47 mm	pore size	0.8 µm	Price	CHF 183.90	Stock	Amount	pack à 100 piece
Item No.	12.4009.04	type no.	ME 27 white	diameter	50 mm	pore size	0.8 µm	Price	CHF 189.10	Stock	Amount	pack à 100 piece
Item No.	12.4009.05	type no.	ME 27 white	diameter	100 mm	pore size	0.8 µm	Price	CHF 466.60	Stock	Amount	pack à 50 piece
Item No.	12.4015.01	type no.	ME 26 white	diameter	25 mm	pore size	0.6 µm	Price	CHF 140.85	Stock	Amount	pack à 100 piece
Item No.	12.4015.02	type no.	ME 26 white	diameter	47 mm	pore size	0.6 µm	Price	CHF 183.95	Stock	Amount	pack à 100 piece
Item No.	12.4015.03	type no.	ME 26 white	diameter	50 mm	pore size	0.6 µm	Price	CHF 189.10	Stock	Amount	pack à 100 piece
Item No.	12.4016.01	type no.	ME 25 white	diameter	25 mm	pore size	0.45 µm	Price	CHF 126.55	Stock	Amount	pack à 100 piece
Item No.	12.4016.02	type no.	ME 25 white	diameter	47 mm	pore size	0.45 µm	Price	CHF 191.80	Stock	Amount	pack à 100 piece
Item No.	12.4016.03	type no.	ME 25 white	diameter	50 mm	pore size	0.45 µm	Price	CHF 179.05	Stock	Amount	pack à 100 piece
Item No.	12.4016.04	type no.	ME 25 white	diameter	90 mm	pore size	0.45 µm	Price	CHF 370.95	Stock	Amount	pack à 50 piece
Item No.	12.4016.05	type no.	ME 25 white	diameter	100 mm	pore size	0.45 µm	Price	CHF 433.60	Stock	Amount	pack à 50 piece
Item No.	12.4016.06	type no.	ME 25 white	diameter	110 mm	pore size	0.45 µm	Price	CHF 449.45	Stock	Amount	pack à 50 piece
Item No.	12.4016.07	type no.	ME 25 white	diameter	142 mm	pore size	0.45 µm	Price	CHF 201.45	Stock	Amount	pack à 25 piece
Item No.	12.4016.09	type no.	ME 25 white	diameter	47 mm	pore size	0.45 µm	Price	CHF 190.40	Stock	Amount	pack à 100 piece
Item No.	12.4016.10	type no.	ME 25 white	diameter	50 mm	pore size	0.45 µm	Price	CHF 194.05	Stock	Amount	pack à 100 piece
Item No.	12.4016.11	type no.	ME 25 white low C	diameter	50 mm	pore size	0.45 µm	Price	CHF 201.55	Stock	Amount	pack à 100 piece
Item No.	12.4017.01	type no.	ME 24 white	diameter	25 mm	pore size	0.2 µm	Price	CHF 126.55	Stock	Amount	pack à 100 piece
Item No.	12.4017.02	type no.	ME 24 white	diameter	47 mm	pore size	0.2 µm	Price	CHF 191.80	Stock	Amount	pack à 100 piece
Item No.	12.4017.03	type no.	ME 24 white	diameter	50 mm	pore size	0.2 µm	Price	CHF 179.05	Stock	Amount	pack à 100 piece
Item No.	12.4017.04	type no.	ME 24 white	diameter	100 mm	pore size	0.2 µm	Price	CHF 404.60	Stock	Amount	pack à 50 piece
Item No.	12.4017.05	type no.	ME 24 white	diameter	110 mm	pore size	0.2 µm	Price	CHF 449.45	Stock	Amount	pack à 50 piece
Item No.	12.4017.06	type no.	ME 24 white	diameter	142 mm	pore size	0.2 µm	Price	CHF 201.45	Stock	Amount	pack à 25 piece
Item No.	12.4017.07	type no.	ME 24 white	diameter	47 mm	pore size	0.2 µm	Price	CHF 190.40	Stock	Amount	pack à 100 piece
Item No.	12.4017.08	type no.	ME 24 white	diameter	50 mm	pore size	0.2 µm	Price	CHF 194.05	Stock	Amount	pack à 100 piece
Item No.	12.4056.01	type no.	ME 27 green, black grid	diameter	50 mm	pore size	0.8 µm	Price	CHF 342.60	Stock	Amount	pack à 100 piece
Item No.	12.4065.01	type no.	ME 25 white, black grid	diameter	47 mm	pore size	0.45 µm	Price	CHF 156.30	Stock	Amount	pack à 100 piece
Item No.	12.4065.04	type no.	ME 25 white, black grid	diameter	50 mm	pore size	0.45 µm	Price	CHF 175.70	Stock	Amount	pack à 100 piece
Item No.	12.4068.06	type no.	ME 25 white, black grid	diameter	50 mm	pore size	0.45 µm	Price	CHF 179.05	Stock	Amount	pack à 100 piece
Item No.	12.4068.08	type no.	ME 25/21 ST white, black grid	diameter	47 mm	pore size	0.45 µm	Price	CHF 211.30	Stock	Amount	pack à 100 piece
Item No.	12.4068.09	type no.	ME 25/21 ST white, black grid	diameter	47 mm	pore size	0.45 µm	Price	CHF 1'261.30	Stock	Amount	pack à 1'000 piece
Item No.	12.4069.02	type no.	ME 24/21ST white, black grid	diameter	47 mm	pore size	0.2 µm	Price	CHF 190.40	Stock	Amount	pack à 100 piece
Item No.	12.4069.03	type no.	ME 24 white, black grid	diameter	50 mm	pore size	0.2 µm	Price	CHF 194.05	Stock	Amount	pack à 100 piece
Item No.	12.4079.01	type no.	ME 25 white, black grid	diameter	47 mm	pore size	0.45 µm	Price	CHF 239.45	Stock	Amount	pack à 100 piece
Item No.	12.4084.01	type no.	ME 28 green, black grid	diameter	50 mm	pore size	1.2 µm	Price	CHF 296.85	Stock	Amount	pack à 100 piece
Item No.	12.4087.01	type no.	ME 24 white, black grid	diameter	47 mm	pore size	0.2 µm	Price	CHF 634.90	Stock	Amount	pack à 400 piece
Item No.	12.4087.02	type no.	ME 24 white, black grid	diameter	50 mm	pore size	0.2 µm	Price	CHF 636.10	Stock	Amount	pack à 400 piece
Item No.	12.4089.01	type no.	ME 27 white, black grid	diameter	50 mm	pore size	0,8 µm	Price	CHF 792.80	Stock	Amount	pack à 100 piece
Item No.	12.4089.02	type no.	ME 27 white, black grid	diameter	47 mm	pore size	0,8 µm	Price	CHF 226.00	Stock	Amount	pack à 100 piece
Item No.	12.4094.01	type no.	ME 25 green, black grid	diameter	47 mm	pore size	0.45 µm	Price	CHF 159.70	Stock	Amount	pack à 1'000 piece
Item No.	12.4097.02	type no.	ME 25 black, white grid	diameter	50 mm	pore size	0.45 µm	Price	CHF 197.90	Stock	Amount	pack à 100 piece
Item No.	12.4097.03	type no.	ME 25 black, white grid	diameter	47 mm	pore size	0.45 µm	Price	CHF 211.30	Stock	Amount	pack à 100 piece
Item No.	12.4097.04	type no.	ME 25 black, white grid	diameter	47 mm	pore size	0.45 µm	Price	CHF 1'017.90	Stock	Amount	pack à 1'000 piece
Item No.	12.4097.05	type no.	ME 25 black, white grid	diameter	50 mm	pore size	0.45 µm	Price	CHF 213.80	Stock	Amount	pack à 100 piece
Item No.	12.4098.01	type no.	ME 26 black, white grid	diameter	50 mm	pore size	0.6 µm	Price	CHF 189.10	Stock	Amount	pack à 100 piece
Item No.	12.4098.02	type no.	ME 26/31STL black, white grid, sterile	diameter	50	pore size	0.6 µm	Price	CHF 682.75	Stock	Amount	pack à 400 piece
Item No.	12.4098.03	type no.	ME26/31ST black, white grid	diameter	47 mm	pore size	0.6 µm	Price	CHF 235.45	Stock	Amount	pack à 100 piece
Item No.	12.4098.04	type no.	ME 26/31STL black, white grid	diameter	50 mm	pore size	0.6 µm	Price	CHF 241.35	Stock	Amount	pack à 100 piece
Item No.	12.4099.01	type no.	ME 27 white, black grid	diameter	47 mm	pore size	0.8 µm	Price	CHF 239.70	Stock	Amount	pack à 100 piece
Item No.	12.7150.01	type no.	WME white	diameter	47 mm	pore size	0.45 µm	Price	CHF 243.10	Stock	Amount	pack à 100 piece
Item No.	12.7150.03	type no.	WME, black grid	diameter	47 mm	pore size	0.45 µm	Price	CHF 229.40	Stock	Amount	pack à 100 piece
Item No.	12.7150.04	type no.	WME, black grid	diameter	47 mm	pore size	0.45 µm	Price	CHF 137.10	Stock	Amount	pack à 100 piece
Item No.	12.7150.05	type no.	WME, black grid	diameter	47 mm	pore size	0.45 µm	Price	CHF 137.10	Stock	Amount	pack à 100 piece
Item No.	12.7150.07	type no.	WME, black grid	diameter	47 mm	pore size	0.45 µm	Price	CHF 1'095.45	Stock	Amount	pack à 1'000 piece
Item No.	12.7150.08	type no.	WME, black grid	diameter	47 mm	pore size	0.45 µm	Price	CHF 82.40	Stock	Amount	pack à 100 piece
Item No.	12.7150.09	type no.	WME white, black grid	diameter	25 mm	pore size	0.8 µm	Price	CHF 288.70	Stock	Amount	pack à 100 piece
Item No.	12.7150.11	type no.	WME black, white grid	diameter	47 mm	pore size	0.45 µm	Price	CHF 321.65	Stock	Amount	pack à 100 piece
Item No.	12.7180.18	type no.	WME, black grid	diameter	47 mm	pore size	0.2 µm	Price	CHF 137.90	Stock	Amount	pack à 100 piece

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