ME25 ST 0.45um 50mm 100/Pk SKU: 10401672

Mixed Cellulose Ester (MCE) Membrane Filters - 10401672

Engineered for high retention efficiency and superior chemical stability, the Whatman 10401672 achieves reliable separation results across a broad range of analytical and preparative applications. Underpinning this performance, precision membrane geometry balances retention sharpness with sustainable flow rates, minimizing the pressure buildup that leads to premature filter replacement. Together, consistent surface properties across the full membrane area support uniform particle capture and reliable results in gravimetric, microscopic, and culture-based analytical workflows.

Material Specifications

• Feature a uniform pore structure that provides consistent flow rates and high throughputs across the full range of standard pore size ratings.
• The biologically inert blend of cellulose acetate and cellulose nitrate provides a membrane surface optimized for organism capture and colony enumeration in microbiological assays.
• Low tare weight and complete solubility in organic solvents make MCE the standard membrane for gravimetric particulate analysis where method specifications demand minimal blank correction.
• Mixed Cellulose Ester membranes combine cellulose acetate and cellulose nitrate polymers to deliver a smoother, more flexible membrane surface than pure cellulose nitrate.
• Bulk format reduces per-unit packaging waste and cost, appropriate for routine particulate removal and clarification where aseptic handling is not specified.

Air monitoring and stack emissions sampling demand a filter medium that withstands the thermal and chemical conditions at your collection point — the material properties described above define the operating envelope for your application. The uniform surface structure of mixed cellulose ester membranes provides the optically flat background that your microscopy and particulate analysis methods require for accurate visualization and particle counting. Secure your research outcomes by partnering with a filtration solution that understands your need for speed, accuracy, and reproducibility.

For more information about chemical compatibility, please review our Chemical Compatibility Chart.

Bubble Point (psi)

35.0psi

Color

white

Diameter

50mm

Extractables

low

Filtration Area

19.63cm²

Flow Rate

60ml (Water)

Grid (Yes/No)

No

Material

Mixed Cellulose Esters (MCE)

Maximum Operating Pressure

Holder-dependent

Maximum Operating Temperature (°C)

130°C

Membrane Thickness (µm)

135um

Pack Count

100

pH Range

4-8

Pore Size (µm)

0.45

Sterility

Nonsterile

Sterilization

Autoclavable at 121°C for 30 mins

Support Material

None

Wettability

Hydrophilic

• Microscopy mounting - Can be made transparent with immersion oil, allowing for direct light microscopy of retained particles on the surface.
• Biochemical Assays - High electrostatic properties effectively bind proteins and macromolecules, supporting various diagnostic and research assays.
• Water Quality Testing - Features a gridded surface for easy colony counting, essential for regulatory compliance in municipal water quality labs.
• Black Grid Analysis - Black membrane variants enhance contrast for light-colored colonies, reducing eye strain during manual plate counting.
• Aqueous Filtration - Biologically inert composition provides high flow rates and consistent reliability for routine laboratory fluid processing.
• Chemotaxis Assays - Acts as a barrier in Boyden chambers, allowing cells to migrate through defined pores towards a chemoattractant source.