Skip to Content
MilliporeSigma
All Photos(1)

Documents

WHA10407334

Whatman® mixed cellulose ester ME 25/31 filter discs 0.45 μm pore size

black, hydrophilic, white grid (3.1 mm), sterile, for membrane butler, 400 EA, 400 ea, 50 mm diam

Synonym(s):

Z697710, osmotic membrane, track etched membranes, water membranes

Sign Into View Organizational & Contract Pricing
All Photos(1)

About This Item

UNSPSC Code:
40161507
NACRES:
NB.24

product name

Whatman® ME membranes for microbiological control, ME25/31 STL membrane circle black, diam. 50 mm, pore size 0.45 μm, white grid, sterile

material

white grid

sterility

sterile

packaging

pkg of 400 ea

manufacturer/tradename

Whatman 10407334
Whatman Article No. 28415199 (US reference)

diam.

50 mm

membrane diam.

47 mm

pore size

0.45 μm

Looking for similar products? Visit Product Comparison Guide

Related Categories

General description

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.

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.

Other Notes

Field of Use : For internal research use only. Products are not intended for diagnostic use or resale.

Legal Information

Whatman is a registered trademark of Cytiva

Certificates of Analysis (COA)

Search for Certificates of Analysis (COA) by entering the products Lot/Batch Number. Lot and Batch Numbers can be found on a product’s label following the words ‘Lot’ or ‘Batch’.

Already Own This Product?

Find documentation for the products that you have recently purchased in the Document Library.

Visit the Document Library

Our team of scientists has experience in all areas of research including Life Science, Material Science, Chemical Synthesis, Chromatography, Analytical and many others.

Contact Technical Service