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
MilliporeSigma™ Gravimetric Analysis Membrane Filter, 0.22 μm
A 0.22 μm pore size non-sterile filter validated for air monitoring.
Sartorius Cellulose Nitrate Membrane Filter
Cellulose nitrate membrane filters with 293 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 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 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.
Cytiva Whatman Cyclopore Polycarbonate Membrane
Featuring sharp cut-off and reproducible microfiltration characteristics of track-etched membrane filters
Cytiva Whatman™ Nuclepore Hydrophilic Membrane
Nuclepore track-etched hydrophilic membranes with highly defined pore size cutoff in sub-micron range
MilliporeSigma™ MF-™ Mixed Cellulose Ester Membranes: Triton-free
Composed of mixed cellulose esters (nitrate and acetate) with minimal amounts of wetting agent. MilliporeSigma™ MF-Millipore™ Mixed Cellulose Ester Membranes: Triton-free are designed for critical applications involving sensitive biological solutions, cell contact or very small volumes.
MilliporeSigma™ Isopore™ Membrane Filters, 10 μm
Use for analyses of airborne contaminants and other particles using optical or electron microscopy. Isopore™ Polycarbonate Membrane Filters have a smooth, glass-like surface for clearer sample observation. Available in a variety of pore sizes/flow rates, diameters and colors.
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™ 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™ 0.8 μm Pore Size (ME 27) Mixed Cellulose Ester Membranes, Plain
Whatman™ (ME 27) Mixed Cellulose Ester Membranes, Plain are particularly effective in applications requiring higher flow rates and larger volume filtration including clarification or sterilization of aqueous solutions, particulate analysis and removal, air monitoring, and microbial analysis.
MilliporeSigma™ Fluoropore™ Membrane Filters, 3 μm
Hydrophobic membrane with laminated backing for easier handling
Cytiva Whatman™ Nitrocellulose Membrane Filters
Recommended for the majority of routine applications, manufactured under strictly controlled conditions