Best 0.45 Micron Membrane Filter Options for Lab Work
Finding reliable 0.45 micron membrane filters is essential for precise microbial analysis, filtration, and sample preparation in water, beverage, pharmaceutical, and environmental testing. The following selections represent commonly used MCE, PES, Nylon, PTFE, and polyamide-based membranes with varying formats and specifications. This guide highlights key features to help you compare materials, pore consistency, and compatibility with your workflow.
Summary Table of Chosen Products
| Product | Brand | Pore Size | Diameter | Type | Approx. Quantity |
|---|---|---|---|---|---|
| Membrane Solutions MCE Gridded Membrane Filter | Membrane Solutions | 0.45 µm | 47 mm | MCE, Gridded | 100/Pack |
| Membrane Filter Papers 100 pcs, 0.45 Micron Nelone | BEXCO | 0.45 µm | 47 mm | Filter Paper | 100 |
| Labfil Nylon Disc Membrane Filters | Labfil | 0.45 µm | 47 mm | Nylon, Hydrophilic | 50 |
| Syringe Filters Hydrophobic Nylon Membrane | zoomto | 0.45 µm | 25 mm | Nylon, Hydrophobic | 100 |
| Syringe Filters PES Membrane, 0.45 µm | ftpuresci | 0.45 µm | 13 mm | PES | 100 |
Membrane Solutions MCE Gridded Membrane Filter
These mixed cellulose ester (MCE) filters combine cellulose acetate and cellulose nitrate to create a biologically inert, hydrophilic membrane suitable for microbial analysis in water, wastewater, cosmetics, pharmaceuticals, and beverages. The sterile, gridded format helps with accurate colony counting and straightforward sterility testing. The product complies with ISO 9001 standards and aligns with ISO 7704 for quality and performance. A notable feature is the grid lines spaced at 3.1 mm, enhancing counting accuracy without grid-line inhibition. This makes the filter a solid choice for routine plating and microbiological checks in modern labs.
The 47 mm diameter fits common filtration manifolds and screen holders. The combination of inert materials minimizes sample interaction, helping preserve integrity during analysis. The sterile packaging reduces contamination risk, which is important for downstream analytics and documentation. Users should note that while ideal for colony counting, the MCE membrane may not be best for all solvent systems due to material composition, so compatibility with your solvent and assay should be checked before use.
Membrane Filter Papers 100 pcs, 0.45 Micron Nelone
The BEXCO 0.45 micron filter papers are designed for laboratory filtration with a 47 mm diameter. This pack includes 100 pieces and is described as Millipore-inspired in some listings, with a 13 cm square footprint approximating the 47 mm disc size. The filters are intended for general lab filtration tasks, including sample prep and filtering for microbial testing. The note of 0.45 micron confirms suitability for capturing bacteria-sized particulates and some colloids, making them useful for routine sterility checks and preliminary sample clarification in various matrices.
Users should consider paper-based membranes versus membrane discs when selecting for compatibility with downstream assays or when needing a hydrophilic surface. The paper format can offer cost-effective options for bulk use but may have different handling characteristics compared to pure disc membranes. If your workflow relies on robust mechanical stability during filtration, compare the physical dimensions and stackability to your existing filtration units.
Labfil Nylon Disc Membrane Filters Hydrophilic
The Labfil 47 mm nylon hydrophilic membrane offers strong chemical compatibility and resistance to a range of organic solvents. It is suitable for high pH samples and is known to bind proteins, which can limit its use in protein recovery work. This membrane is widely used for aqueous samples, filtration in chromatography workflows, and general environmental testing. The hydrophilic nylon surface supports efficient wetting and faster filtration, with good particle retention at 0.45 µm. Labs should be mindful of potential protein interactions depending on the application and consider alternative membranes if protein recovery is required for their assay.
Syringe Filters Hydrophobic Nylon Membrane
This set features 0.45 µm nylon syringe filters with 25 mm disc diameter, designed for high-throughput filtration. The hydrophobic nylon membrane provides broad chemical compatibility and robust chemical stability, making it suitable for non-polar solvent systems and sample clarification in HPLC and GC work. The housing is designed for a tight seal and minimal leakage, with a Luer lock connection ensuring consistent flow and reduced dead volume. Because nylon membranes can exhibit hydrophobicity, they are not ideal for aqueous protein recovery processes. Consider solvent compatibility and sample type when selecting these for your workflow.
Syringe Filters PES Membrane, 0.45 Micron
The PES (polyethersulfone) membrane syringe filters provide ultra-efficient micro-filtration with ready-to-use hydrophilic properties. PES membranes typically offer good chemical resistance and quick wettability, making them suitable for a range of aqueous samples, including biological fluids and environmental samples. The 0.45 µm pore size supports general filtration needs where particulate removal is required before analyses like HPLC or UV-Vis. The 13 mm format is compact for tight spaces and high-throughput workflows. Consider chemical compatibility and any potential adsorption of analytes when choosing PES filters for specific assays.
Deschem PTFE Membrane Filter
The Deschem 90 mm PTFE membrane filter runs at 0.45 µm pore size and is designed for robust chemical resistance and compatibility with a wide range of solvents. PTFE membranes are known for low protein binding and excellent chemical inertness, making them suitable for both aqueous and organic samples. The larger 90 mm diameter can be used in bigger filtration setups or as a part of a multi-filter assembly. PTFE membranes may be more expensive but offer broad solvent compatibility and sterile or non-sterile options depending on the product line. Verify your solvent and assay requirements to ensure PTFE aligns with your test parameters.
StonyLab Nylon Membrane Filters
The StonyLab nylon membrane filters provide hydrophilic nylon discs suitable for aqueous samples, HPLC, and multiple solvent systems. The 94 mm diameter and 0.45 µm pore size offer a larger filtration area while maintaining a fine filtration level. These filters are suitable for a variety of laboratory uses, including sample preparation, vacuum degassing, and particle retention. The nylon membrane tends to be compatible with many organic solvents but should be tested for specific solvent interactions. A 50-pack configuration supports mid-volume lab use and process consistency across batches.
Omicron Nylon Membrane Circle
The Omicron 170090X nylon membrane circle is a hydrophilic 90 mm disc intended for applications requiring a larger filtration area. It is suitable for microbiological media filtration, sera, and other additives, with capacity for multiple uses in serial tests. The product emphasizes stability through autoclaving and suitability for high-temperature cycles, along with compatibility for HPLC solvent filtration. Hydrophilic surfaces promote easier wetting and consistent flow. Consider the trade-off between disk size and the mechanical fit into your filtration apparatus when integrating this membrane into established workflows.
Buying Guide
- Membrane material: MCE, nylon, PES, PTFE, and other polymers each have distinct chemical compatibilities, protein interactions, and solvent resistance. Choose based on your sample type and downstream analysis.
- Hydrophilic vs hydrophobic: Hydrophilic membranes wet more easily with aqueous samples; hydrophobic membranes may be preferred for non-polar solvents but can cause wetting challenges.
- Pore size and consistency: 0.45 µm is a common compromise for bacteria capture and particulate removal. Verify lot-to-lot consistency and grid patterns if colony counting is essential.
- Diameter and format: 47 mm discs fit standard manifolds; 13 mm and 25 mm syringe filters suit compact or high-throughput setups. Ensure the unit dimensions integrate with your filtration system.
- Sterile vs non-sterile: Sterile discs prevent contamination in sensitive microbiological workflows. For nonsterile processes, validate with your QA procedures.
- Intended use: Some membranes bind proteins or particulates, affecting recovery for certain assays. If protein recovery is required, avoid materials prone to binding and consider alternatives.
- Cost-per-use: Filter papers offer bulk cost savings; disc membranes may provide better durability and handling in repetitive filtration tasks. Calculate per-sample cost for budgeting.
- Storage and handling: Store filters in clean, dry environments to preserve performance and prevent contamination. Check shelf life and packaging integrity upon receipt.
- Compatibility checks: Review solvent compatibility, sample pH, and organic content to ensure the membrane maintains structural integrity and performance.