For a clean, low-particle sample, a 13 mm disc can be a practical starting point for a small aliquot, while 25 mm, 47 mm, and 90 mm discs offer progressively more filtration area for larger volumes. These are starting points, not fixed volume limits: suspended solids, viscosity, membrane type, pore size, and the filter holder can change how much sample a disc processes before flow slows or the membrane clogs. Choose the smallest diameter that provides sufficient usable area and fits your holder, then confirm it with a representative sample when filtration performance matters. The geometric area of a disc is calculated from its diameter using A = πd²/4.
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Use the table as an initial planning guide for relatively clear, water-like samples. The volume bands are practical examples rather than guaranteed capacities, because a clean sample and a particle-rich sample of the same volume can behave very differently. Always confirm that the selected diameter matches the filtration device and the membrane’s intended use.
| Sample volume to evaluate | Starting disc diameter | Typical reason to consider it |
|---|---|---|
| Up to about 10 mL | 13 mm | Small aliquots and limited sample volumes, if the sample is not heavily loaded with particles |
| About 10–100 mL | 25 mm | Routine small-volume filtration where a 13 mm disc may have insufficient working area |
| About 100–500 mL | 47 mm | General laboratory batches that benefit from a larger membrane area |
| Above about 500 mL | 90 mm or a suitable larger-capacity setup | Higher-volume processing, particularly when the sample and holder support a larger disc |
A larger membrane disc provides more geometric area for liquid to pass through. For example, a 13 mm disc has an approximate geometric area of 1.33 cm², a 25 mm disc about 4.91 cm², a 47 mm disc about 17.35 cm², and a 90 mm disc about 63.62 cm². These figures are calculated from nominal diameter and describe the full circular area, not necessarily the usable filtration area inside a particular holder.
More area can help distribute particle loading and may delay clogging, but it does not guarantee a specific flow rate or processing capacity. Actual performance also depends on the membrane’s pore structure, sample properties, pressure or vacuum conditions, and the filter assembly. A larger disc is useful only when the holder seals it correctly and the sample volume justifies the additional material and equipment size.
Start with the volume you need to filter in one run, not just the total quantity collected. Record whether the sample is clear, visibly turbid, particulate-rich, viscous, or prone to forming a surface layer. If the sample is variable, use the most demanding representative condition for initial sizing rather than assuming every batch will filter like a clean water sample.
Confirm which disc diameters your filter holder accepts and whether the holder’s exposed area is smaller than the disc itself. The membrane must sit flat, form a proper seal, and avoid unsupported edges that could compromise the assembly. When comparing suppliers or formats, check whether a stated diameter refers to the nominal disc size or to the active area available during filtration.
For low-solids samples and small aliquots, a smaller disc may be convenient and help limit membrane use. If filtration slows noticeably, the sample contains more suspended material, or repeated runs become impractical, evaluate the next diameter that fits your equipment. For very high particle loads, increasing diameter may not be enough; prefiltration or another process adjustment may be worth assessing.
Diameter determines the disc’s footprint, but it does not determine what the filter retains or whether the membrane is compatible with the sample. Select the membrane material based on chemical compatibility and intended application, then select pore size according to the required separation. Do not choose a finer pore size simply to compensate for an undersized disc, because finer filtration may change flow behavior and should match the process objective.
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One common mistake is treating sample volume as the only sizing variable. A 100 mL clear solution may be easier to process than a much smaller suspension with a high particle load, so a volume-only rule can lead to poor flow or premature clogging. The table’s volume bands should therefore be used to shortlist a diameter, not as a promise of capacity.
Another mistake is ordering a disc based on nominal diameter without checking the holder. A disc that is too small or too large for the support may not seal or seat as intended. Buyers should also avoid comparing membrane area alone when material, pore size, holder geometry, and process conditions differ.
When the correct diameter is uncertain, test the candidate sizes with a representative sample and the intended holder. Record the filtered volume, approximate filtration time, operating conditions, and any visible clogging or leakage. A simple comparison across two suitable disc sizes can reveal whether added area improves the workflow enough to justify a larger format.
If the sample varies from batch to batch, evaluate the more challenging expected condition and establish an internal acceptance criterion, such as a maximum filtration time or a required processed volume. Keep pore size, membrane material, and operating conditions consistent during the comparison so that diameter is the principal variable. Where sample volume is large, ask whether staged filtration, prefiltration, or a larger format is compatible with the process rather than assuming one disc must handle every condition.
For a B2B purchase, share the intended volume per run, sample type, particle loading if known, required pore size, membrane material preference, and current holder model. This information helps a supplier assess whether a standard disc diameter is a sensible starting point and identify compatibility questions before quotation. Also confirm packaging, quantity requirements, lead time, and whether the requested dimensions and specifications are available for the project.
At YuFen, we can discuss membrane filter disc selection around your sample volume, filtration setup, and application requirements. Provide your target diameter or holder details together with the sample conditions, and our team can help review suitable options for your inquiry. Any final selection should be checked against your process requirements and evaluated with representative samples where performance is critical.
For a first selection, consider 13 mm discs for small, relatively clean aliquots, 25 mm for modest volumes, 47 mm for larger laboratory batches, and 90 mm or a suitable larger-capacity setup for higher volumes. Treat these diameter-to-volume pairings as starting points, because particle loading, viscosity, membrane choice, holder area, and operating conditions can change the result. The geometric areas—approximately 1.33 cm² at 13 mm, 17.35 cm² at 47 mm, and 63.62 cm² at 90 mm—show how substantially available area can increase with diameter, but do not establish a guaranteed filtration capacity.
To move forward, identify your per-run volume, sample characteristics, required pore size and membrane material, and holder model. Shortlist a compatible diameter, then confirm it with a representative filtration test or discuss the application with YuFen before requesting a quotation. This approach gives your team a practical basis for selecting a disc size without relying on volume alone.
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