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
Tisch Scientific MCE Membrane Filter, 0.22 µm, 293 mm, Nonsterile, 25 Pack, SF14676
Tisch MCE membrane filters are developed from a mixture of cellulose acetate and cellulose nitrate and are one of the most widely used filters in both air monitoring and analytical applications.
Azzota Corp Microporous Filter, Cn-Ca, Diameter: 25mm, Pore Size: 0.22um, 200/Pk
Microporous Filter, CN-CA, Diameter: 25mm, Pore Size: 0.22um, 200/pk
Sterlitech Corporation Polycarbonate (PCTE) Membrane Filters, Black, 0.2 Micron, 25mm, 100/pk
These hydrophilic, polycarbonate track-etch (PCTE) membrane filters have been pigmented using black dye to minimize membrane autofluorescence. The dyed PCTE membrane filters are ideal for use with fluorescence microscopy analyses that involve direct observation and enumeration of animal cells or microorganisms that have been labeled with fluorescent markers. They are also suitable for optical microscopy studies of light colored particles and microorganisms by providing a dark background for enhanced contrast.
Sterlitech Corporation Polycarbonate (PCTE) Membrane Filters, 30.0 Micron, 47mm, 100/Pk
Polycarbonate (PCTE) membrane filters, 30.0 micron, 47mm 100/pack
Cole-Parmer Sterile CA/Glass Prefilter Syringe Filters, 0.22um/26mm; 50/Box
Filters are Triton-free and have a bidirectional membrane support and luer lock inlet/outlet for a secure fit to the syringe. Membrane type and pore size are printed on each filter for easy identification. All Cole-Parmer syringe filters are 100% integrity tested and manufactured in accordance with ISO 9002 standards. Sterile filters are sterilized by gamma radiation. They are certified nonpyrogenic, noncytotoxic, and are blister packed.