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Thumbnail Filmstrip of Plain Cellulose Nitrate Membrane, 0.1um Pore Size, 47mm Circle (100 pcs) Images
Cellulose Nitrate (CN) Membrane Filters - 7181-004
Designed to deliver reproducibility and confidence across critical sample types, the Whatman 7181-004 provides the filtration consistency that method validation demands. Precision membrane geometry balances retention sharpness with sustainable flow rates, minimizing the pressure buildup that leads to premature filter replacement. From raw polymer through final inspection, the manufacturing process is designed to ensure that every membrane disc meets the performance specifications of its grade designation.
Material Specifications
- Dissolves completely in specific organic solvents, enabling full recovery of captured particles from the membrane surface for downstream gravimetric, chemical, or spectroscopic analysis.
- Surface retention characteristics allow captured particles and microorganisms to remain on the membrane face, supporting direct microscopic examination and physical recovery of collected material.
- Cellulose nitrate membranes feature a narrow pore size distribution and low extractable levels, providing the controlled retention characteristics required for gravimetric and particulate analysis.
- Naturally hydrophilic and compatible with aqueous solutions, cellulose nitrate delivers high flow rates and rapid wet-out without requiring pre-conditioning or surfactant treatment.
- Autoclavable at 121°C without loss of integrity, cellulose nitrate membranes maintain their rated pore structure and dimensional stability through repeated sterilization cycles.
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. For applications like these, low extractable levels in cellulose nitrate membranes mean your blank measurements stay minimal, giving you the confidence that weight changes in gravimetric analysis reflect actual sample content rather than membrane artifacts. 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)
- > 80psi
- Color
- white
- Diameter
- 47mm
- Extractables
- low
- Filtration Area
- 17.35cm²
- Flow Rate
- 5ml (Water)
- Grid (Yes/No)
- No
- Material
- Cellulose Nitrate (CN)
- Maximum Operating Pressure
- Holder-dependent
- Maximum Operating Temperature (°C)
- 80°C
- Membrane Thickness (µm)
- 105–140um
- Pack Count
- 100
- pH Range
- 4-9
- Pore Size (µm)
- 0.1
- Sterility
- Nonsterile
- Sterilization
- Autoclavable at 121°C for 30 mins
- Support Material
- None
- Wettability
- Hydrophilic
- Aerosol Analysis - Low tare weight and acid digestibility enable chemical characterization of airborne particulates from air sampling.
- Gravimetric Particulate Analysis - Dissolves in organic solvents for complete particle recovery and accurate weight-based quantification.
- Colony Enumeration - Gridded surface variants facilitate accurate plate counting of captured microorganisms under standard magnification.
- Environmental Compliance - Documented retention characteristics at standard pore ratings support reproducibility in regulated testing programs.
- Bioburden Monitoring - Surface retention keeps captured organisms accessible for direct incubation and enumeration without transfer steps.
- Biochemical Assays - High protein-binding capacity effectively immobilizes macromolecules, supporting lateral flow and diagnostic testing.