Whatman Sterile Mixed Cellulose Ester Membranes – 0.45 µm

Description

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.

Parameter	Mixed Cellulose Ester Circle, 0.45 µm pore size
Diameter:	47 mm, 50 mm
Interleaving Paper:	Yes
For Membrane Butler:	No
Product Name :	Mixed Cellulose Ester Circle ME Range (ME 25), plain, sterile, 0.45 µm pore size, 47 mm ME25/21 (Mixed Cellulose Ester) ST Membrane Circle, white, 47 mm 0.45 µm, 3.1 mm black grid, sterile Mixed Cellulose Ester Circle ME Range (ME 25), white/black grid 3.1 mm, sterile, 0.45 µm pore size, 47 mm Mixed Cellulose Ester Circle ME Range (ME 25), white/black grid 3.1 mm, sterile, 0.45 µm pore size, 47 mm ME25/41 (Mixed Cellulose Ester) ST Membrane Circle, green, 47 mm 0.45 µm, 3.1 mm black grid, sterile Mixed Cellulose Ester Circle ME Range (ME 25), black/white grid 3.1 mm, sterile, 0.45 µm pore size, 47 mm Mixed Cellulose Ester Circle ME Range (ME 25), black/white grid 3.1 mm, sterile, 0.45 µm pore size, 47 mm Mixed Cellulose Ester Circle WME Range, 0.45 µm pore size, sterile, individually packed, white, gridded, with pad, 47 mm, 100 pieces Mixed Cellulose Ester Circle WME Range, 0.45 µm pore size, sterile, individually packed, white, gridded, without pad, 47 mm, 100 pieces Mixed Cellulose Ester Circle WME Range, 0.45 µm pore size, sterile, individually packed, white, gridded, without pad, 47 mm, 200 pieces Mixed Cellulose Ester Circle WME Range, 0.45 µm pore size, sterile, individually packed, white, gridded, without pad, 47 mm, 1000 pieces Mixed Cellulose Ester Circle WME Range, 0.45 µm pore size, sterile, individually packed, black, gridded, with pad, 47 mm, 100 pieces Mixed Cellulose Ester Circle WME Range, 0.20 µm pore size, sterile, individually packed, white, gridded, without pad, 47 mm, 100 pieces Mixed Cellulose Ester Circle ME Range (ME 25), plain, sterile, 0.45 µm pore size, 50 mm Mixed Cellulose Ester Circle ME Range (ME 25), white/black grid 5 mm, sterile, 0.45 µm pore size, 50 mm ME25/21 (Mixed Cellulose Ester) ST Membrane Circle, white, 50 mm 0.45 µm, 3.1 mm black grid, sterile ME25/41 (Mixed Cellulose Ester) ST Membrane Circle, green, 50 mm 0.45 µm, 3.1 mm black grid, sterile Mixed Cellulose Ester Circle ME Range (ME 25), black/white grid 3.1 mm, sterile, 0.45 µm pore size, 50 mm

Parameter	Mixed Cellulose Ester Circle, 0.45 µm pore size
Diameter:	50 mm
Interleaving Paper:	No
For Membrane Butler:	Yes
Pack size:	400 pieces
Product Name:	ME25 SELECT/21 47MM ST 100/PK ME25 SELECT/21 50MM ST 100/PK ME25 SELECT/21 STL 50MM 400/PK ME25 Select 21 STL Circles, White, Mixed Esters, 47mm Dia, 0.45µm, 3.1mm Black Grid, Sterile, For Membrance Dispensers, 400/pk ME25/21 (Mixed Cellulose Ester) STL Membrane Circle, white, 47 mm 0.45 µm, 3.1 mm black grid, sterile, for Membrane-Butler ME25/21 (Mixed Cellulose Ester) STL Membrane Circle, white, 50 mm 0.45 µm, 3.1 mm black grid, sterile, for Membrane-Butler ME25 (Mixed Cellulose Ester) Membrane Circle, white, 50 mm 0.45 µm, 5 mm black grid, sterile, for Membrane-Butler ME25/31 (Mixed Cellulose Ester) STL Membrane Circle, black, 47 mm 0.45 µm, 3.1 mm white grid, sterile, for Membrane-Butler ME25/31 (Mixed Cellulose Ester) STL Membrane Circle, black, 50 mm 0.45 µm, 3.1 mm white grid, sterile, for Membrane-ButlerME25/31 (Mixed Cellulose Ester) STL Membrane Circle, black, 50 mm 0.45 µm, 3.1 mm white grid, sterile, for Membrane-Butler ME25/41 (Mixed Cellulose Ester) STL Membrane Circle, green, 47mm 0.45 µm, 3.1 mm black grid, sterile, for Membrane-Butler ME25/41 (Mixed Cellulose Ester) STL Membrane Circle, green, 50 mm 0.45 µm, 3.1 mm black grid, sterile, for Membrane-Butler