Whatman
CA Membrane Circle (OE 66), 0.2um Pore Size, 142mm Circle (25 pcs) SKU: 10404131

Cellulose Acetate (CA) Membrane Filters - 10404131

Engineered for high retention efficiency and superior chemical stability, the Whatman 10404131 achieves reliable separation results across a broad range of analytical and preparative applications. Precision membrane geometry balances retention sharpness with sustainable flow rates, minimizing the pressure buildup that leads to premature filter replacement. Accordingly, lot-level verification of pore size, flow rate, and physical dimensions ensures that membrane performance remains predictable when scaling from method development to routine analysis.

Material Specifications

• Economical bulk packaging supports laboratories with high consumable throughput where individual sterile wrapping is unnecessary.
• Manufactured with a uniform pore structure that maintains consistent retention characteristics across the full membrane surface.
• Particularly well suited for electrophoresis and immunoassay support applications where predictable binding behavior is essential.
• Cellulose Acetate membranes combine high flow rates with exceptional thermal stability.
• Offer improved chemical resistance to low molecular weight alcohols compared to MCE.

Microbial enumeration methods require complete retention at the rated pore size and a surface that supports colony growth without inhibition, and the membrane specifications above confirm both requirements for your culture-based workflows. The consistent pore structure of CA membranes across production lots means your filtration step performs identically from batch to batch, eliminating the membrane as a variable when you troubleshoot unexpected analytical results. 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)

52.0psi

Color

white

Diameter

142mm

Extractables

low

Filtration Area

158.37cm²

Flow Rate

20ml (Water)

Grid (Yes/No)

No

Material

Cellulose Acetate (CA)

Maximum Operating Pressure

Holder-dependent

Maximum Operating Temperature (°C)

180°C

Membrane Thickness (µm)

135um

Pack Count

25

pH Range

4-8

Pore Size (µm)

0.2

Sterility

Nonsterile

Sterilization

Autoclavable at 121°C for 30 mins

Support Material

None

Wettability

Hydrophilic

• Tissue Culture Media - Sterilizes heat-labile media components with minimal hold-up volume, ensuring expensive additives are not wasted.
• Isotope Studies - Used in binding studies where the membrane itself must not interact with the radioactive ligand or the receptor protein.
• Low Binding Filtration - Ideal for filtering dilute protein solutions where maximum recovery is needed to maintain experimental accuracy.
• Wine Stability Testing - Filters wine samples to check for colloidal stability, ensuring the product will not precipitate during shelf storage.
• Groundwater Filtration - Filters dissolved metals samples without adsorption, ensuring the filtrate represents the true environmental state.
• Nutrient Analysis - Clarifies water for nitrate/phosphate testing without leaching nitrogenous material that could bias the results.