Membrane Filter, round, ME25/41. MCE, 50 mm, 0.45 µm, green, 100 pc/PAK

• Sterile options available for critical applications.
• Excellent contrast for easier particle detection.
• Grids are non-toxic and do not inhibit bacterial growth, ensuring sample integrity.
• Black smooth and black grid membranes have a blend of cellulose nitrate and cellulose acetate.
• Membrane provides a high degree of internal surface area for greater product adsorption.
• Higher dirt holding capacity.
• Biologically inert with good thermal stability.
• No surfactants to contaminate samples.
• The uniform microporous membrane structure enables high flow rates.

Whatman mixed cellulose ester membranes are composed of cellulose acetate and cellulose nitrate. These membranes feature a smoother and more uniform surface than pure nitrocellulose filters. The color contrast provided by the filter surface facilitates particle detection and minimizes eye fatigue. The ME series has a lower cellulose acetate content than the WME membrane. In microbiological colony counting procedures, the color contrast between the surface and the colonies facilitates the counting process. Facilitated counting process Many microbiological techniques involve colony counting after incubation as a standard method of quantification. Whatman grid filters have clearly defined grid lines spaced 3.1 mm or 5 mm apart. The special ink used is non-toxic and completely free of bacterial growth inhibitors. Whatman black mixed cellulose esters are available for automated colony counting applications as well as gridded to assist manual counting procedures. Black membranes provide contrast between the residue or cell colors and the filter without the need to counterstain the membrane. Plain or gridded For those laboratories that prefer to use membranes sterilized by autoclaving for microbiological work, Whatman provides black gridded membranes in packs of pads ready for autoclaving in the laboratory.

The certificate can be found here if required: https://www.cytivalifesciences.com/en/de/support/quality/certificates