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
Merck Isopore™ Membrane Filters, 0.1 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.
Macherey-Nagel™ Porafil™ CM Membrane Filter, Grid
Ideal for gravimetric analysis with aqueous solutions and for contamination tests. Macherey-Nagel™ Porafil™ CM Membrane Filters, Grid are hydrophilic cellulose mixed ester membranes that are thermally stable to 125°C. Available sterile or non-sterile (autoclavable at 121°C).
Cytiva Whatman™ Polyester Drain Discs
Provides a flat surface to eliminate filter tearing or rupturing. Whatman™ Polyester Drain Discs are used to support membrane filters. They are available in a variety of diameters for use in a range of devices.
Fisherbrand™ Nylon Membrane Filter
Naturally hydrophilic membrane designed to wet out evenly and retain its superior strength during use in general filtration or medical assays.
Merck Fluoropore™ Membrane Filters, 1 μm
Hydrophobic membrane with laminated backing for easier handling
Merck Durapore™ Membrane Filters, 0.45 μm
Durapore™ Membrane Filters are recommended when maximum recovery is important.
Merck Durapore™ Membrane Filters, 0.1 μm
Durapore™ Membrane Filters are recommended when maximum recovery is important.
Sartorius Polycarbonate Membrane Filters
These hydrophilic Polycarbonate Membrane track-etched Filters are manufactured from high quality polycarbonate film using track-etch technology. Smooth, flat surface for good visibility.
Merck Nylon Net Filters, 10 μm
Hydrophilic nylon membrane
Sartorius Cellulose Acetate Membrane Filters
Combines high flow rates and thermal stability with very low adsorption characteristics. Sartorius Cellulose Acetate Membrane Filters are excellently suited for use in pressure filtration devices. Non-sterile filters in a variety of diameters and pore sizes are bulk-packed to save money and space.
Merck Express™ PLUS Membrane Filters
Plain white polyethersulfone Express™ PLUS Membrane Filters provide ultrafast filtration for a variety of applications.
Cytiva Whatman™ Nylon Membranes
Flexible and durable for easier handling. Cytiva Nylon Membranes are naturally hydrophilic, eliminating need for wetting agents and prewetting when filtering aqueous solutions.
Sartorius Stedim Biotech™ Cellulose Nitrate (Mixed Cellulose Ester) Membrane Filters, Type 11327, 0.2μm
Sartorius Stedim Biotech™ Cellulose Nitrate (Mixed Cellulose Ester) Membrane Filters, Type 11327, 0.2μm are recommended for a broad range of applications including liquid filtering for sample preparation.