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™ Type WCN Cellulose Nitrate Membranes
Recommended for majority of routine applications, this membrane is manufactured under strictly controlled conditions. Whatman™ Type WCN Cellulose Nitrate Membranes narrow pore size distribution for improved surface capture and analysis.
Cytiva Whatman™ Nuclepore Hydrophilic Membrane
Nuclepore track-etched hydrophilic membranes with highly defined pore size cutoff in sub-micron range
Sartorius Polyethersulfone Membrane Filters
Polyethersulfone (PES) filters have a high internal porosity.
MilliporeSigma™ MF-Millipore™ Membrane Filter, 0.8 μm
Mixed cellulose esters (MCE) membrane, hydrophilic
GVS PreSep™ Glass Fiber Filter
Glass fiber is biologically inert, autoclavable and highly resistant to oxidizing agents and weak acids. Glass fiber can be used to extend the life of a final filter as a prefilter or they can be used alone for low cost sample clarification.
MilliporeSigma™ MF-Millipore™ Membrane Filter, 1.2 μm
Mixed cellulose esters (MCE) membrane, hydrophilic
GVS Polycarbonate Track Etched (PCTE) Membrane, Hydrophilic, Disc, 20 μm
GVS Polycarbonate Track Etched (PCTE) Membranes are hydrophilic or hydrophobic and available in pore sizes from 0.01 to 20 μm.
GVS Speed Pack
Gridded white or black sterilized MCE membranes in continuous folded ribbon for easy dispensing and convenience, compatible with various dispensers (Microsart E-motion EZ-Pak EZ-Pak Curve Whatman Membrane Butler)
GVS Polyester Track Etched (PETE) Membrane
GVS Polyester Track Etched (PETE) Membranes available in pore sizes from 0.2 to 10 μm.
Cytiva Whatman™ Nylon Membrane Circle
For filtering aqueous solutions and most organic solvents
MilliporeSigma™ Nylon Net Filters, 60 μm
Hydrophilic nylon membrane
Cytiva Whatman™ 0.45 μm Pore Size (ME 25) Mixed Cellulose Ester Membranes, White/Black Grid
Whatman™ (ME 25) Mixed Cellulose Ester Membranes, White/Black Grid are particularly effective in applications requiring higher flow rates and larger volume filtration. Supplied with clearly defined grid lines at regularly spaced intervals to assist in microbiological colony counting.
GVS Polytetrafluoroethylene (PTFE) Membrane
GVS Polytetrafluoroethylene (PTFE) Membrane are hydrophobic and available in pore sizes from 0.2 to 10 μm.
MilliporeSigma™ Isopore™ Membrane Filters, 0.2 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.
MilliporeSigma™ Isopore™ Membrane Filters, 5 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.