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™ PES (Polyethersulfone) Membrane Filter, 100/Pk, 25 mm, 0.45 μm
CellPro™ Polyethersulfone (PES) membrane filters are hydrophilic, high performance laboratory filters designed for fast flow rates, low extractables, and minimal protein binding. They are ideal for sterile filtration, clarification of biological fluids, cell culture media preparation, and pharmaceutical or analytical sample processing. PES membranes are preferred when high throughput and low sample loss are critical, especially with protein rich or sensitive biological solutions. The membrane offers broad chemical compatibility with aqueous solutions, alcohols, and dilute acids or bases. Hydrophilic construction eliminates the need for pre wetting, allowing immediate use with water based samples while maintaining consistent filtration performance and reliable particle retention in laboratory workflows.
Sterlitech Corporation Polyester (PETE) Membrane Filters, Hydrophobic, Nonwoven Support, 0.2 Micron, 13mm, 100/Pk
Hydrophobic PETE membrane filters are a great option for venting applications where PTFE or polyolefin membrane filters have traditionally been utilized.Applications:* Vent filters for electrical enclosures* Vent filters for microbial retention in medical devices* Air/gas filtration while repelling liquid water* Air/gas filtration while repelling oils and solvents with surface tension >25 dynes/cm
MilliporeSigma EMD Millipore Capsule Filter, Durapore PVDF, 0.22 μm, 4 in. Length
The EMD Millipore Opticap XL Capsule is a Durapore 0.22 μm filter with hydrophilic PVDF media, designed for sterile filtration in bioprocessing applications. It is non-sterile and gamma compatible.
- Constructed from PVDF membrane, polyester/polyethylene support, and gamma-stable polypropylene housing.
- Meets FDA indirect food additive requirements (21 CFR 177-182).
- 0.22 μm pore size for effective microorganism retention.
- Low bacterial endotoxin levels (≤0.5 EU/mL).
- Bubble point ≥3450 mbar (50 psig) at 23 °C.
- Nominal length: 4 in. (10 cm); filtration area: 0.18 m2.
- Max operating pressure: 80 psi at 25 °C.
- Sterilization compatible via autoclaving or 45 kilogray gamma exposure.
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.
Sterlitech Corporation Aluminum Oxide Membrane Filters, 0.02 Micron, 25mm, 10/pk
Aluminum oxide membranes feature uniform, densely-packed honeycomb pore structures that contribute to precise retention and high porosity characteristics.Applications:* HPLC sample and mobile phase filtration* Filtration of aggressive organic solvents* Virus concentration and analysis* Analysis of micro plastic in water* Epifluorescence microscopy* Synthesis of nanostructures (e.g. nanotubes)Features:* Fast filtration, efficient separation and high purity* High number of tightly controlled pores in honeycomb shape* Free of organic extractables and leachables* Minimum adsorption* Transparent when wet
Alkali Scientific ProCycle™ Pre-cut Sealing Membranes, Non-Sterile, Aluminum membrane, 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%.
