Whatman™ Mixed Cellulose Ester Membranes, Non-Sterile, 0.45 µm

Supplier: Whatman products (Cytiva)
Whatman™
10401614 10401606 10406512 10401612 10406512 10406812 10401626 7141-204 10401621 10409714 10401614 10406814 10401618 10401621 10406814 10401618 10401606 10409414 7141-004 10406812 10409714 10401664 7141-204 10401626 10401631 10401664 10401612 10409414 7141-004 10401631
89187-132PK 156.75 USD
CA11013-578 CA28297-738 CA11013-972 CA74300-040 CA11013-970 CA74300-042 CA11013-472 89187-132 CA28297-730 10034-962 76423-744 11008-578 10034-958 10034-914 10035-798 10035-796 74330-192 CA74330-192 74300-040 28297-730 74300-042 10034-912 10034-910 CA11013-580 CA89187-132 CA11013-040 CA76423-744 28297-738 CA11012-736 CA11008-578
Whatman™ Mixed Cellulose Ester Membranes, Non-Sterile, 0.45 µm
Filters Membrane Filters
Mixed cellulose ester, WME range, circles, gridded. 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.

  • 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

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.

In microbiological colony counting procedures, the color contrast between the surface and the colonies facilitates the counting process.

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 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.

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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