Whatman Sterile Mixed Cellulose Ester Membranes – 0.45 µm

ID	Product Name
28415197	ME25 (Mixed Cellulose Ester) Membrane Circle, white, 50 mm 0.45 µm, 5 mm black grid, sterile, for Membrane-Butler
29016666	ME25 Select 21 STL Circles, White, Mixed Esters, 47mm Dia, 0.45µm, 3.1mm Black Grid, Sterile, For Membrance Dispensers, 400/pk
29014373	ME25 SELECT/21 47MM ST 100/PK
29014375	ME25 SELECT/21 50MM ST 100/PK
29016662	ME25 SELECT/21 STL 50MM 400/PK
28415175	ME25/21 (Mixed Cellulose Ester) ST Membrane Circle, white, 47 mm 0.45 µm, 3.1 mm black grid, sterile
28415177	ME25/21 (Mixed Cellulose Ester) ST Membrane Circle, white, 50 mm 0.45 µm, 3.1 mm black grid, sterile
28415194	ME25/21 (Mixed Cellulose Ester) STL Membrane Circle, white, 47 mm 0.45 µm, 3.1 mm black grid, sterile, for Membrane-Butler
28415195	ME25/21 (Mixed Cellulose Ester) STL Membrane Circle, white, 50 mm 0.45 µm, 3.1 mm black grid, sterile, for Membrane-Butler
28415198	ME25/31 (Mixed Cellulose Ester) STL Membrane Circle, black, 47 mm 0.45 µm, 3.1 mm white grid, sterile, for Membrane-Butler
28415199	ME25/31 (Mixed Cellulose Ester) STL Membrane Circle, black, 50 mm 0.45 µm, 3.1 mm white grid, sterile, for Membrane-Butler
28415253	ME25/41 (Mixed Cellulose Ester) ST Membrane Circle, green, 47 mm 0.45 µm, 3.1 mm black grid, sterile
28415255	ME25/41 (Mixed Cellulose Ester) ST Membrane Circle, green, 50 mm 0.45 µm, 3.1 mm black grid, sterile
28415205	ME25/41 (Mixed Cellulose Ester) STL Membrane Circle, green, 47mm 0.45 µm, 3.1 mm black grid, sterile, for Membrane-Butler
28415206	ME25/41 (Mixed Cellulose Ester) STL Membrane Circle, green, 50 mm 0.45 µm, 3.1 mm black grid, sterile, for Membrane-Butler
28415259	Mixed Cellulose Ester Circle ME Range (ME 25), black/white grid 3.1 mm, sterile, 0.45 µm pore size, 47 mm
28415260	Mixed Cellulose Ester Circle ME Range (ME 25), black/white grid 3.1 mm, sterile, 0.45 µm pore size, 47 mm
28415261	Mixed Cellulose Ester Circle ME Range (ME 25), black/white grid 3.1 mm, sterile, 0.45 µm pore size, 50 mm
28415040	Mixed Cellulose Ester Circle ME Range (ME 25), plain, sterile, 0.45 µm pore size, 47 mm
28415041	Mixed Cellulose Ester Circle ME Range (ME 25), plain, sterile, 0.45 µm pore size, 50 mm
28415236	Mixed Cellulose Ester Circle ME Range (ME 25), white/black grid 3.1 mm, sterile, 0.45 µm pore size, 47 mm
28415176	Mixed Cellulose Ester Circle ME Range (ME 25), white/black grid 3.1 mm, sterile, 0.45 µm pore size, 47 mm
28415170	Mixed Cellulose Ester Circle ME Range (ME 25), white/black grid 5 mm, sterile, 0.45 µm pore size, 50 mm
28420749	Mixed Cellulose Ester Circle WME Range, 0.20 µm pore size, sterile, individually packed, white, gridded, without pad, 47 mm, 100 pieces
28420729	Mixed Cellulose Ester Circle WME Range, 0.45 µm pore size, sterile, individually packed, black, gridded, with pad, 47 mm, 100 pieces
28420719	Mixed Cellulose Ester Circle WME Range, 0.45 µm pore size, sterile, individually packed, white, gridded, with pad, 47 mm, 100 pieces
28420720	Mixed Cellulose Ester Circle WME Range, 0.45 µm pore size, sterile, individually packed, white, gridded, without pad, 47 mm, 100 pieces
28420722	Mixed Cellulose Ester Circle WME Range, 0.45 µm pore size, sterile, individually packed, white, gridded, without pad, 47 mm, 1000 pieces
28420721	Mixed Cellulose Ester Circle WME Range, 0.45 µm pore size, sterile, individually packed, white, gridded, without pad, 47 mm, 200 pieces
28420716	Mixed Cellulose Ester Circle WME Range, 0.45 µm pore size, sterile, individually packed, white, plain, with pad, 47 mm, 100 pieces

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.

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Product	Product Name	Interleaving Paper All No Yes	Pack size All 100 pieces 400 pieces 1000 pieces 200 pieces	Diameter All 50 mm 47 mm	For Membrane Butler All No Yes	Price
10401670	Mixed Cellulose Ester Circle ME Range (ME 25), plain, sterile, 0.45 µm pore size, 47 mm Item must be purchased in units of 1	Yes	100 pieces	47 mm	No	171.69 USD	Add to cart {{stock.stockMessage}}
10409770	Mixed Cellulose Ester Circle ME Range (ME 25), black/white grid 3.1 mm, sterile, 0.45 µm pore size, 47 mm Item must be purchased in units of 1	Yes	100 pieces	47 mm	No	168.75 USD	Add to cart {{stock.stockMessage}}
10409472	ME25/41 (Mixed Cellulose Ester) ST Membrane Circle, green, 50 mm 0.45 µm, 3.1 mm black grid, sterile Item must be purchased in units of 1	Yes	100 pieces	50 mm	No	171.69 USD	Add to cart {{stock.stockMessage}}
10409470	ME25/41 (Mixed Cellulose Ester) ST Membrane Circle, green, 47 mm 0.45 µm, 3.1 mm black grid, sterile Item must be purchased in units of 1	Yes	100 pieces	47 mm	No	168.75 USD	Add to cart {{stock.stockMessage}}
10407970	Mixed Cellulose Ester Circle ME Range (ME 25), white/black grid 3.1 mm, sterile, 0.45 µm pore size, 47 mm Item must be purchased in units of 1	Yes	100 pieces	47 mm	No	208.00 USD	Add to cart {{stock.stockMessage}}
10407372	ME25/41 (Mixed Cellulose Ester) STL Membrane Circle, green, 50 mm 0.45 µm, 3.1 mm black grid, sterile, for Membrane-Butler Item must be purchased in units of 1	No	400 pieces	50 mm	Yes	565.00 USD	Add to cart {{stock.stockMessage}}
10407370	ME25/41 (Mixed Cellulose Ester) STL Membrane Circle, green, 47mm 0.45 µm, 3.1 mm black grid, sterile, for Membrane-Butler Item must be purchased in units of 1	No	400 pieces	47 mm	Yes	547.00 USD	Add to cart {{stock.stockMessage}}
10407334	ME25/31 (Mixed Cellulose Ester) STL Membrane Circle, black, 50 mm 0.45 µm, 3.1 mm white grid, sterile, for Membrane-Butler Item must be purchased in units of 1	No	400 pieces	50 mm	Yes	565.00 USD	Add to cart {{stock.stockMessage}}
10407332	ME25/31 (Mixed Cellulose Ester) STL Membrane Circle, black, 47 mm 0.45 µm, 3.1 mm white grid, sterile, for Membrane-Butler Item must be purchased in units of 1	No	400 pieces	47 mm	Yes	560.00 USD	Add to cart {{stock.stockMessage}}
10407324	ME25 (Mixed Cellulose Ester) Membrane Circle, white, 50 mm 0.45 µm, 5 mm black grid, sterile, for Membrane-Butler Item must be purchased in units of 1	No	400 pieces	50 mm	Yes	579.00 USD	Add to cart {{stock.stockMessage}}
10407314	ME25/21 (Mixed Cellulose Ester) STL Membrane Circle, white, 50 mm 0.45 µm, 3.1 mm black grid, sterile, for Membrane-Butler Item must be purchased in units of 1	No	400 pieces	50 mm	Yes	565.00 USD	Add to cart {{stock.stockMessage}}
10407312	ME25/21 (Mixed Cellulose Ester) STL Membrane Circle, white, 47 mm 0.45 µm, 3.1 mm black grid, sterile, for Membrane-Butler Item must be purchased in units of 1	No	400 pieces	47 mm	Yes	551.00 USD	Add to cart {{stock.stockMessage}}
10406872	ME25/21 (Mixed Cellulose Ester) ST Membrane Circle, white, 50 mm 0.45 µm, 3.1 mm black grid, sterile Item must be purchased in units of 1	Yes	100 pieces	50 mm	No	171.69 USD	Add to cart {{stock.stockMessage}}
10406871	Mixed Cellulose Ester Circle ME Range (ME 25), white/black grid 3.1 mm, sterile, 0.45 µm pore size, 47 mm Item must be purchased in units of 1	Yes	1000 pieces	47 mm	No	970.00 USD	Add to cart {{stock.stockMessage}}
10406870	ME25/21 (Mixed Cellulose Ester) ST Membrane Circle, white, 47 mm 0.45 µm, 3.1 mm black grid, sterile Item must be purchased in units of 1	Yes	100 pieces	47 mm	No	55.69 USD	Add to cart {{stock.stockMessage}}
10406572	Mixed Cellulose Ester Circle ME Range (ME 25), white/black grid 5 mm, sterile, 0.45 µm pore size, 50 mm Item must be purchased in units of 1	Yes	100 pieces	50 mm	No	171.69 USD	Add to cart {{stock.stockMessage}}
10401672	Mixed Cellulose Ester Circle ME Range (ME 25), plain, sterile, 0.45 µm pore size, 50 mm Item must be purchased in units of 1	Yes	100 pieces	50 mm	No	171.69 USD	Add to cart {{stock.stockMessage}}
10409772	Mixed Cellulose Ester Circle ME Range (ME 25), black/white grid 3.1 mm, sterile, 0.45 µm pore size, 50 mm Item must be purchased in units of 1	Yes	100 pieces	50 mm	No	171.69 USD	Add to cart {{stock.stockMessage}}
10409771	Mixed Cellulose Ester Circle ME Range (ME 25), black/white grid 3.1 mm, sterile, 0.45 µm pore size, 47 mm Item must be purchased in units of 1	Yes	1000 pieces	47 mm	No	1,003.00 USD	Add to cart {{stock.stockMessage}}
7187-114	Mixed Cellulose Ester Circle WME Range, 0.20 µm pore size, sterile, individually packed, white, gridded, without pad, 47 mm, 100 pieces Item must be purchased in units of 1	Yes	100 pieces	47 mm	No	133.72 USD	Add to cart {{stock.stockMessage}}
7153-104	Mixed Cellulose Ester Circle WME Range, 0.45 µm pore size, sterile, individually packed, black, gridded, with pad, 47 mm, 100 pieces Item must be purchased in units of 1	Yes	100 pieces	47 mm	No	253.00 USD	Add to cart {{stock.stockMessage}}
10406802	ME25 SELECT/21 STL 50MM 400/PK Item must be purchased in units of 1	No	400 pieces	50 mm	Yes	Temporarily unavailable
7141-154	Mixed Cellulose Ester Circle WME Range, 0.45 µm pore size, sterile, individually packed, white, gridded, without pad, 47 mm, 1000 pieces Item must be purchased in units of 1	Yes	1000 pieces	47 mm	No	634.00 USD	Add to cart {{stock.stockMessage}}
10406803	ME25 Select 21 STL Circles, White, Mixed Esters, 47mm Dia, 0.45µm, 3.1mm Black Grid, Sterile, For Membrance Dispensers, 400/pk Item must be purchased in units of 1	No	400 pieces	47 mm	Yes	Temporarily unavailable
7141-124	Mixed Cellulose Ester Circle WME Range, 0.45 µm pore size, sterile, individually packed, white, gridded, without pad, 47 mm, 200 pieces Item must be purchased in units of 1	Yes	200 pieces	47 mm	No	221.00 USD	Add to cart {{stock.stockMessage}}
7141-114	Mixed Cellulose Ester Circle WME Range, 0.45 µm pore size, sterile, individually packed, white, gridded, without pad, 47 mm, 100 pieces Item must be purchased in units of 1	Yes	100 pieces	47 mm	No	114.41 USD	Add to cart {{stock.stockMessage}}
7141-104	Mixed Cellulose Ester Circle WME Range, 0.45 µm pore size, sterile, individually packed, white, gridded, with pad, 47 mm, 100 pieces Item must be purchased in units of 1	Yes	100 pieces	47 mm	No	114.41 USD	Add to cart {{stock.stockMessage}}
7140-104	Mixed Cellulose Ester Circle WME Range, 0.45 µm pore size, sterile, individually packed, white, plain, with pad, 47 mm, 100 pieces Item must be purchased in units of 1	No	100 pieces			177.45 USD	Add to cart {{stock.stockMessage}}
10406801	ME25 SELECT/21 50MM ST 100/PK Item must be purchased in units of 1	No	100 pieces	50 mm	Yes	Temporarily unavailable
10406800	ME25 SELECT/21 47MM ST 100/PK Item must be purchased in units of 1	No	100 pieces	47 mm	Yes	Temporarily unavailable

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Whatman Sterile Mixed Cellulose Ester Membranes – 0.45 µm

Whatman Sterile Mixed Cellulose Ester Membranes – 0.45 µm

Eased counting process

Plain or gridded

Sterile filters

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