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
Alkali Scientific CellPro™ MCE (Mixed Cellulose Ester) Membrane Filter, 100/Pk, 25 mm, 0.45 μm
CellPro™ MCE (Mixed Cellulose Ester) Membrane Filters are high performance filtration membranes commonly used in laboratory and industrial applications for microbiological analysis, particle monitoring, and air/water testing. These filters are composed of a blend of cellulose acetate and cellulose nitrate, combining the strengths of both materials for reliable and consistent performance. Key Features: High Porosity (up to 80–85%): Ensures fast flow rates and high throughput. Uniform Pore Structure: Provides accurate and consistent retention of microorganisms and particles. Hydrophilic Nature: Eliminates the need for pre wetting with surfactants; ideal for aqueous solutions. Low Extractables: Minimizes contamination risks in sensitive analyses. Smooth, White Surface (or Gridded Options): Makes it easy to visually inspect and count colonies during microbiological testing.
Alkali Scientific CellPro™ Cellulose Acetate (CA) Membrane Filter, 100/Pk, 90 mm, 0.22 μm
CellPro™ Cellulose Acetate (CA) Membrane Filter is a filter medium made of cellulose acetate as the main material. Cellulose acetate is a polymer material with excellent physical and chemical stability, widely used in the field of filtration and separation. CA membrane filter is formed into a filter layer with a specific pore and structure through a precise manufacturing process, which can effectively intercept impurities such as suspended particles, microorganisms, colloids, etc. in the liquid. Application • Biomedicine: used for filtering cell culture fluids, removing microorganisms and impurities, and ensuring a pure growth environment for cells. • Food and Beverage: filtering juices, beverages and other liquids, removing suspended particles and microorganisms, and improving product clarity and safety. • Laboratory Research: used for filtering various liquids in scientific research experiments to meet the requirements of experiments for liquid purity. Fe
Alkali Scientific Media Storage Bottles, Polystyrene, VFS, Neck 45mm, 500mL, 1/pk, 24/cs
These vacuum bottle top filter systems provide a cost effective and efficient solution for sterilizing and clarifying aqueous biological media. Featuring a 0.22 μm PES (polyethersulfone) membrane, they offer high flow rates, low protein binding, and minimal chemical extractables—ideal for general purpose laboratory filtration where extreme chemical resistance is not required. • High flow rates and throughput • Low protein adsorption and low extractables • 0.22 μm PES membrane for reliable sterilization • Sterile, non pyrogenic, DNase/RNase free • E beam sterilized, SAL = 10⁻⁶ • Individually packaged in sterile bags • Endotoxin free and pyrogen free
Alkali Scientific CellPro™ NY Nylon Membrane Filter, 100/Pk, 25 mm, 0.22 μm
CellPro™ NY (Nylon) Membrane Filters are durable, hydrophilic membranes made from high quality nylon polymer, designed for general purpose filtration of aqueous solutions and many organic solvents. These membranes provide excellent mechanical strength, high flow rates, and broad chemical compatibility, making them suitable for sample preparation, sterilization, microbiology, and analytical applications. Nylon membranes exhibit low extractables and reliable binding characteristics for nucleic acids and proteins, supporting use in biochemical and environmental testing workflows. Because of their hydrophilic structure, they require no pre wetting and allow fast, efficient filtration of both acidic and alkaline solutions. Available in multiple pore s and diameters, these filters are supplied in convenient packs of 100, ready for routine laboratory and research use.
Sigma Aldrich Fine Chemicals Biosciences PVC Membrane filter 5.0
Polyvinylidene chloride (PVC) membranes are specified by ASTM NIOSH and OSHA in air monitoring applications to analyze silica carbon black metals quartz particulates and others..filters composed of pure medical-grade PVC .Use for air monitoring applications to analyze silica carbon black or quartz particulates .Available in 5.0 181m filters features Benefits.High-quality medical-grade PVC polymer .PVC is non-hygroscopic so humidity will not impact your gravimetric analysis ApplicationsAir Monitoring of Particulate Contaminants Including Silica Metals and Quartz
Foxx Life Sciences EZLabpure™ PVDF Hydrophilic Membrane Filters, 0.45µm Pore Size, 142mm Diameter Filtration Membrane Discs, Non Sterile, 25/PK
EZLabpure™ PVDF Hydrophilic Membrane Filters designed for high-performance sample clarification and sterile filtration of aqueous and protein-sensitive solutions. Manufactured with premium polyvinylidene fluoride (PVDF) membranes, these membrane filter discs provide low protein binding, excellent chemical resistance, and consistent flow rates for laboratory applications. Available in 0.22 um and 0.45 um pore sizes, and offered in 13 mm, 25 mm, 47 mm, 90 mm, and 142 mm diameters, all variants are non-sterile for research and analytical use. All filters are non-sterile and comply with USP Class VI Standards.
These Filtration Membrane Disc Filters have excellent water wettability, providing high flow rate. PVDF membranes are naturally hydrophobic but are modified to a hydrophilic nature, making them useful for a wide range of applications, both aqueous and non-aggressive solvents-based. These membranes are typically low protein binding and are used for sterilizing filtration.
EMD MILLIPORE 3P BIOPHARM MILLIPAK 200 0.22UM STR.FLT3PK
Millipak-200 , 0.22micrometer, 14 mm ( 9/16 in. ) hose barb inlet and outlet, nonsterile, 3/PK.
Electron Microscopy Sciences POLYSTYRENE LATEX SIZE 0.204 µm
Uniform polystyrene latex (size 0.204 microns) is suspended on a Formvar/Carbon grid and is usefule for checking magnification and calibration.
