Filtration Membrane Discs
Thin, precut membrane rounds for high-throughput, fast filtration of liquid and gas samples. Gridded and non-gridded discs. Various materials including mixed cellulose ester, polycarbonate, PTFE, nylon, and PVDF. For air monitoring/analytical research.
Sizes
Filter membranes are made in a range of diameters, typically designed to fit a specific holder or manifold.
Materials
Filter membrane can be made from cellulose, mixed cellulose esters (MCE), polyvinylidene fluoride (PVDF), polyethersulfone (PES), polyvinyl chloride (PVC), polytetrafluoroethylene (PTFE), nylon, polycarbonate (PC), polyester, polyethylene terephthalate (PET), and polypropylene (PP). Other membrane materials include aluminum oxide, gelatin, porcelain, and glass.
Pore Size
The size of membrane pores determines which particles will be retained by the filter. A pore size of 0.2 µm is small enough to remove microbes from solutions; a 0.45 µm ore size can remove larger particulates.
Color and Grids
White membrane filters may be plain or marked with square grids (outlined in black) that can help with enumerating particles. Gridded or plain black membrane filters may be helpful when filtering light-colored particulates.
Sterility
Filter membranes may be pre-sterilized or may be sterilized using ethylene oxide, gamma irradiation, or autoclaves. The need for sterility is determined by the application, which are many and varied:
- Light microscopy samples
- Cytology sample preparation
- Electron microscopy samples
- Air quality and other environmental monitoring
- Water analysis and water quality testing
- Microbiology colony counting and quality control
- Chemotaxis
- Sterile preparation of buffers, tissue culture media, microbiological media, and other biological fluids
Cytiva Whatman™ Nitrocellulose Membrane Filters
Recommended for the majority of routine applications, manufactured under strictly controlled conditions
Cytiva Whatman™ Anodisc™ Filter Membranes
Constructed with precision pore structure and narrow pore size distribution. Whatman™ Anodisc™ Filter Membranes ensure a high level of particle removal efficiency. Captures microorganisms and particulates on the surface of the membrane for subsequent analysis.
Sartorius Cellulose Acetate Membrane Filter
Cellulose acetate membrane filters with 293 mm diameter combine thermal stability with exceptionally low adsorption characteristics.
Sartorius Cellulose Nitrate Membrane Filter
Cellulose nitrate membrane filters with 142 mm diameters are hydrophilic, have high flow rates thanks to their symmetrical structure and are compatible with aqueous solutions, hydrocarbons and several other organic solvents.
Sartorius Microsart™ e.motion Membrane Filters
For colony counting, particle testing and microscopy. Specifically designed for use in the Microsart™ e.motion dispenser, the filters are individually sterile-sealed in a format packaged on a pleated band, without protective paper. Can also be used with Sartorius nutrient pad sets.
Sartorius Regenerated cellulose (RC) Membrane Filters
These solvent-resistant, hydrophilic membrane filters are excellently suited for particle removal from solvents.
Sartorius Microsart™ e.motion Membrane Filters
For colony counting, particle testing and microscopy. Specifically designed for use in the Microsart™ e.motion dispenser, the filters are individually sterile-sealed in a format packaged on a pleated band, without protective paper. Can also be used with Sartorius nutrient pad sets.
MilliporeSigma™ Immobilon-NC Membranes, Triton-Free, 0.45 μm
Mixed Cellulose Esters, Surfactant-free
Sartorius Nongridded Sterile Cellulose Membrane Filters
Ensure quality control in routine microbiological filtering. Sartorius Nongridded Sterile Cellulose Membrane Filters are single-packed membranes used for colony counting, particle testing, microscopy and sterility testing. Choose between cellulose acetate or cellulose nitrate membranes in a variety of pore sizes.
Cytiva Nucleus Membrane
Made from polycarbonate film, for precision analysis of track-etched manufacturing
Cytiva™ Whatman™ Microplus MP31 Nitrocellulose Filtration Membranes, with Grid
Whatman™ MicroPlus MP31 Filtration Membranes are recommended for most routine applications and are manufactured under strictly controlled conditions. Supplied as 135 mm x 240 mm sheets with imprinted grid pattern (white lines on black) to aid particle counting.
Cytiva™ Whatman™ RC55 Regenerated Cellulose (Cellulose Acetate) Filtration Membranes
Whatman™ RC55 Regenerated Cellulose Filtration Membranes provide broad chemical compatibility and can be used with aqueous solutions or organic solvents. With low extractable and low binding properties they are ideal for sample preparation/mobile filtration in HPLC and with protein-containing solutions.
Cytiva™ Whatman™ NC45 Nitrocellulose Filtration Membranes
Whatman™ NC45 Nitrocellulose Membrane Filters are known for higher strength and flexibility, low extractables, and narrow pore size distribution. They are recommended for routine applications and are manufactured under strictly controlled conditions.
Cytiva Life Sciences™ Sentino Membrane Dispenser Refill ME25
Gridded, ME25 mixed cellulose ester membranes.
Sartorius Gridded Nonsterile Cellulose Nitrate Membrane Filters: 0.8μm Pore Size
The non-sterile Membrane Filters are made of cellulose nitrate (cellulose mixed ester), cellulose acetate or regenerated cellulose. They can be used for colony counting, particle testing and microscopy. Choose between gridded or non-gridded, membranes, either with or without hydrophobic edge.