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 Polypropylene Membrane Filters, 0.45 um, 47mm, Nonsterile, 200 per pack, SF14554
Polypropylene Membrane Filters, 0.45um, 47mm, Nonsterile, 200 per pack
Sterlitech Corporation Polyester (PETE) Membrane Filters, Transparent, 0.4 micron, 12 Micron Thickness, 2E6 pores/cm2, 25mm, 100/pack
Polyester (PETE) Membrane Filters, Transparent, 0.4 micron, 12 Micron Thickness, 2E6 pores/cm2, 25mm, 100/pack
Cole-Parmer Spectra/Mesh 148145 Screen Discs, 47 mm, Nylon, 100 µm, pack of 10
There are four material options to choose from. The nylon mesh filters out particles down to 8 µm. These are ideal for finer macrofiltration needs and are suitable with all aqueous solutions. Polypropylene (PP) mesh offers strength and stability, while also being resistant to most acids, alkalies, and alcohols. These screens are autoclavable. The PEEK mesh holds its shape and features superior chemical resistance. These are ideal for general filtration, are resistant to acidic and alkaline solutions, and feature temperature stability up to 250°C. The 304 Stainless Steel woven discs or sheets are ideal for high differential pressure applications as they are durable and feature extra strength.
Alkali Scientific ProCycle™ Pre-cut Sealing Membranes, Non-Sterile, qPCR Optical (sticky adhesive film) Bio-Rad™ Type, 10 bags of 10 membranes
RNase, DNase, DNA, and PCR inhibitor free Evaporation rates ≤ 5% Inner packs of 10 membranes PureAmp™ Sealing Membranes are compatible with all standard PCR plates. Membrane options include pierceable aluminum, standard transparent, optically clear sticky adhesive, optically clear pressure-sensitive adhesive, and low-adhesive EZ-peel, all of which are guaranteed to keep evaporation rates below 5%.
MDI Membrane FLT MDI EHCN 47MM .45 EO 100PK
mdi Cellulose Nitrate membrane filters with Hydrophobic Edge for Antibiotics, 47 mm, 0.45 µm, EO-sterile, 100 PK
Ace Glass, Inc. 25mm ID x 30cm chromatography column, 24/40 outer top, 250mL reservoir, without filter disc
25mm I.D. x 30cm chromatography column with 250mL reservoir at top and 2mm bore 1:5 PTFE stopcock plug at bottom. Opening at top is for a 24/40 outer joint.
Meissner STyLUX Hydrophilic PES Filter
Meissner STyLUX Hydrophilic PES Filter, 47mm Disc, 0.2µm, 12.4cm² EFA, Non-Sterile