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™ Fluoropore™ Membrane Filter for Filtration of Solvents
The Fluoropore™ membrane filter is a hydrophobic, polytetrafluoroethylene (PTFE) polymer membrane bonded to a high density polyethylene support to improve filter handling characteristics for normal applications.
Sartorius Microsart™ @Filter 250 in Trays
Membrane filters suitable for use in the Microsart @Filter units
DWK Life Sciences DURAN™ Sintered Glass Filter discs
Non-fused edge
Cytiva Whatman™ 90 mm Nuclepore™ Polycarbonate Track-Etched Membranes
Manufactured from high-quality polycarbonate film and track-etched for high pore size precision. Whatman™ Polycarbonate Hydrophilic Membranes combine high flow rates and chemical and thermal resistance with sharply defined pores, making them suitable for microscopy, cytology, parasitology, and certain air and oceanography analyses.
Cytiva Whatman™ Regenerated Cellulose Membranes: Grade RC 60
Consists of pure cellulose without any wetting agents
Cytiva Whatman™ Regenerated Cellulose Membranes: Grade RC 58
Consists of pure cellulose without any wetting agents
Cytiva Whatman™ Polyamide Membranes
Universal filter made from pure polyamide for clarification and sterile filtration
Cytiva Whatman™ Cellulose Acetate Membranes
Prepares liquid scintillation cocktail for scintillation counter measurements. Whatman™ Cellulose Acetate Membranes are highly heat resistant and can filter hot liquids and hot gases.
Cytiva Whatman™ 0.8 μm Pore Size (ME 27) Mixed Cellulose Ester Membranes, White/Black Grid
Whatman™ (ME 27) 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.
Cytiva Whatman™ Regenerated Cellulose Membranes: Grade RC 55
Consists of pure cellulose without any wetting agents.
Cytiva GN Metricel™ Membrane Disc Filters
Certified for the microbiological analysis of potable, waste, process, and natural waters in accordance with the Membrane Filter Technique referenced in Standard Methods for the Examination of Water and Wastewater.
GVS Laminated PTFE Membranes
Naturally hydrophobic, plain white membranes
GVS PCTE Filter Membranes: Plain Black for Epifluorescence
Treated to appear dark gray—ideal for epifluorescence microscopy
GVS Polycarbonate Track Etched (PCTE) Membrane, Hydrophilic, Disc, 0.1 μm
GVS Polycarbonate Track Etched (PCTE) Membranes are hydrophilic or hydrophobic and available in pore sizes from 0.01 to 20 μm.