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 Nucleus Membrane
Made from polycarbonate film, for precision analysis of track-etched manufacturing
Cytiva Whatman Cyclopore Polycarbonate Membrane
Featuring sharp cut-off and reproducible microfiltration characteristics of track-etched membrane filters
Cytiva Whatman™ WTP Range PTFE Membranes
Suited for applications involving aggressive organic solvents, strong acids, and alkalis due to being chemically stable and inert. Whatman™ WTP Range PTFE Membranes are particularly suitable for preparing samples for HPLC analysis, air and gas sterilization.
MilliporeSigma™ Fluoropore™ Membrane Filter, Pore Size: 5 μm
Unlike fibrous filter media that trap particles in their matrix, Fluoropore™ membranes collect particles on their surface. For use in airborne particle monitoring applications.
MilliporeSigma Millipore Polypropylene Membrane Filter, 0.45 μm
Hydrophilic polypropylene filters in 25, 47, and 90 mm sizes offer reliable aqueous filtration, low extractables, and consistent flow for lab use
MilliporeSigma™ MF-Millipore™ Membrane Filters
MF-Millipore™ Membrane Filters designed to provide strength, flexibility and broad chemical compatibility for critical biological separations.
MilliporeSigma™ Immobilon-NC Membranes, Triton-Free, 0.45 μm
Mixed Cellulose Esters, Surfactant-free
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.
MilliporeSigma™ MF-Millipore™ Membrane Filter, 0.05 μm
13 mm diameter, mixed cellulose esters (MCE) membrane, hydrophilic
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.
MilliporeSigma Millipore Polypropylene Membrane Filter, 0.2 μm
Hydrophilic polypropylene filters in 25, 47, and 90 mm sizes offer reliable aqueous filtration, low extractables, and consistent flow for lab use
MilliporeSigma Millipore Polypropylene Membrane Filter, 0.45 μm
Hydrophobic polypropylene filters in 25, 47, and 90 mm sizes offer reliable aqueous filtration, low extractables, and consistent flow for lab use
Thermo Scientific Zeta Plus™ LP Series Media Sheet
Filter media is composed of inorganic filter aid cationic resin and is designed to be very low in extractables. This LP media is completely free of asbestos and glass microfibre.
Sartorius Gridded Sterile Cellulose Nitrate Membrane Filters: 0.65μm
Membrane Filters for Colony Counting, Particle Testing and Microscopy - Cellulose nitrate (cellulose ester), gridded, individually, sterile packaged
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.