Finding reliable 0.45 µm membrane filters is essential for consistent microbial analysis, water testing, and sample preparation in lab workflows. The following selections represent commonly used 0.45 µm membranes in standard formats, including MCE discs, PTFE, PES, and PVDF materials. Each product listing highlights compatibility, sterility, and grid features to support colony counting, clarity in analysis, and robust performance across aqueous samples and viscous solutions.
| Product | Brand | Pore Size | Diameter | Pack Size |
|---|---|---|---|---|
| Membrane Solutions MCE Gridded Membrane Filter | Membrane Solutions | 0.45 µm | 47 mm | 100/pack |
| Biomed Scientific Syringe Filter PTFE | Biomed Scientific | 0.45 µm | 25 mm | 100/pack |
| Sterile Syringe Filter PES | PEKYBIO | 0.45 µm | 33 mm | 20/pack |
| Labfil PVDF Syringe Filter | Labfil | 0.45 µm | 33 mm | 20/pack |
| zoomto MCE Gridded Membrane Filter | zoomto | 0.45 µm | 47 mm | Pack of 50 |
Membrane Solutions MCE Gridded 47 mm Filter
The Membrane Solutions MCE gridded filter combines mixed cellulose esters with a hydrophilic surface suitable for microbiological analysis in water, wastewater, cosmetics, pharmaceuticals, and beverages. The product is sterile and packaged without a support layer, supporting clean colony counting and sterility testing. ISO 9001 certification and ISO 7704 alignment underscore quality control, while the 3.1 mm grid lines assist in accurate colony enumeration without counting interference. Applications span routine QC workflows to environmental monitoring, providing reliable performance for quick post-filtration analysis.
Biomed Scientific PTFE 25 mm Filter
The Biomed Scientific PTFE syringe filter features a hydrophobic PTFE membrane and a polypropylene housing, designed for non-sterile use with a 25 mm diameter and 0.45 µm pore size. The product is packaged as 100 per pack with inlet and outlet connectors specified as female Luer and male slip Luer, respectively. This configuration supports rapid filtration of aqueous solutions and organic solvents in applications such as sample preparation for HPLC or general filtering where chemical compatibility is important. The PTFE membrane offers chemical resistance and stable performance across a range of pH and solvent conditions.
PEKYBIO PES 33 mm Sterile Filter
This PEKYBIO sterile syringe filter uses a PES hydrophilic membrane noted for stability in acidic and basic conditions, low extractables, and low protein binding. It is suitable for numerous aqueous and some organic solvent workflows, featuring high flow rates and the ability to withstand elevated temperatures. The 33 mm diameter and sterile gamma-irradiated packaging suit HPLC sample preparation and other filtration tasks where consistent pore reliability and rapid filtration are required. The product is designed for single-use sterile workflows with precise Luer connections.
Labfil PVDF 33 mm Syringe Filter
The Labfil PVDF hydrophilic membrane is suitable for general biological sample filtration with broad chemical compatibility and low protein binding. The 33 mm diameter supports typical sample volumes, and the filter is packaged sterile with individual packaging. Inlet and outlet connections are female Luer Lock and male Luer slip respectively. PVDF membranes provide robust chemical resistance and stable performance across a variety of lab matrices, enabling efficient recovery of samples while maintaining filtration integrity under standard laboratory conditions.
zoomto MCE Gridded 47 mm Filter Pack
The zoomto MCE gridded membrane filter is a sterile, pre-sterilized disc filter featuring a 47 mm diameter and 0.45 µm pore size. Pack options include a 50-count, making it suitable for routine lab workloads that require a steady supply of sterile membrane discs. Material composition blends nitrocellulose and cellulose acetate, delivering high bacterial recovery and a flat, easy-to-count surface. The grid lines at 3.1 mm intervals help visualize colonies while preserving filter performance and structural integrity during filtration and counting processes.
Buying Guide: Key Considerations for 0.45 µm Membrane Filters
- Filter material and compatibility: Choose MCE for broad compatibility with water and aqueous samples; PTFE for chemical resistance to organic solvents; PES for stability across varied pH; PVDF for high protein recovery and robust chemical tolerance.
- Sterility and packaging: Sterile, pre-packaged options are essential for microbiological workflows and preventing cross-contamination. Consider gamma irradiation or ethylene oxide sterilization depending on downstream use.
- Diameter and format: 25 mm filters suit inline syringe filtration and compact setups; 33 mm and 47 mm discs accommodate larger sample volumes and higher flow rates. Gridded discs improve colony counting accuracy.
- Temperature and solvent tolerance: Some membranes tolerate high temperatures and certain solvents; verify maximum operating temperatures to match your sample prep protocol and storage needs.
- Flow rate and porosity: High flow rates reduce filtration time, while grid lines aid counting without introducing grid line inhibition. Balance flow with recovery requirements for your target analytes.
- Single-use vs. multi-pack: For high-throughput labs, pack size matters for cost efficiency and inventory management. Consider compatibility with existing lọwer-connection standards (Luer locks, slip fittings).
- Application scope: For environmental water testing, choose membranes with inert coatings and minimal extractables. For protein-rich samples, PVDF or PES membranes may offer improved recovery and reduced fouling.
- Quality certifications: ISO certifications and compliance with ISO 7704 can signal consistent manufacturing and quality control practices.
These selections provide a spectrum of 0.45 µm membrane options across common formats, helping laboratories align material properties with specific sample types, filtration workflows, and safety requirements. When selecting a membrane, prioritize compatibility with your solvents, the required sterility level, and the intended downstream analyses to ensure reliable, repeatable results.