CA 47mm WH 0.45um 100/Pk SKU: 7000-0004

Cellulose Acetate (CA) Membrane Filters - 7000-0004

The Whatman 7000-0004 combines a controlled pore size distribution with low extractable levels, ensuring the data accuracy that sensitive analytical methods require. Constructed for reliable operation, quality-controlled manufacturing ensures the filtration medium delivers the retention efficiency and throughput that demanding laboratory protocols require. Each membrane disc reflects a manufacturing standard where retention characteristics, physical integrity, and dimensional accuracy are verified before release.

Material Specifications

• Offer improved chemical resistance to low molecular weight alcohols compared to MCE.
• Cellulose Acetate membranes combine high flow rates with exceptional thermal stability.
• Naturally hydrophilic and compatible with aqueous biological solutions without pre-wetting or surfactant treatment.
• Particularly well suited for electrophoresis and immunoassay support applications where predictable binding behavior is essential.
• Manufactured with a uniform pore structure that maintains consistent retention characteristics across the full membrane surface.

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. Here, 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. Take control of your sample preparation variables and ensure that your data reflects the true nature of your work, rather than the quality of your consumables.

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

Bubble Point (psi)

52.0psi

Color

white

Diameter

47mm

Extractables

low

Filtration Area

17.35cm²

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

100

pH Range

4-9

Pore Size (µm)

0.45

Sterility

Nonsterile

Sterilization

Autoclavable at 121°C for 30 mins

Support Material

None

Wettability

Hydrophilic

• Biological Fluid Prep - Clarifies urine or cerebrospinal fluid for clinical chemistry without removing the low-abundance proteins of interest.
• Groundwater Filtration - Filters dissolved metals samples without adsorption, ensuring the filtrate represents the true environmental state.
• Isotope Studies - Used in binding studies where the membrane itself must not interact with the radioactive ligand or the receptor protein.
• Tissue Culture Media - Sterilizes heat-labile media components with minimal hold-up volume, ensuring expensive additives are not wasted.
• Low Binding Filtration - Ideal for filtering dilute protein solutions where maximum recovery is needed to maintain experimental accuracy.
• Enzyme Sterilization - Preserves enzymatic activity during cold sterilization, preventing the denaturation often caused by surface binding.