Syringeless Filters and Syringe Filters
Syringeless filters and syringe filters are commonly constructed from PVDF or PTFE. They are used to filter impurities such as fine particles from small to medium sample volumes prior to use and are suitable for both aqueous and aqueous-organic samples.
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FAQ
Syringeless filters integrate the sample chamber and membrane in one device, so you can filter by pressing, often faster with fewer components. Syringe filters attach to a syringe and offer more flexibility for solvents and volumes. Popular options include Whatman, Merck Millex, Sartorius Minisart, Thermo Scientific and Fisherbrand ranges.
Match membrane chemistry to your solvent and analytes. PES is a common choice for aqueous samples; PTFE handles aggressive solvents and many organics; nylon is versatile for many aqueous/organic mixes; PVDF can suit low protein-binding needs. Check compatibility guidance from brands like Merck, Sartorius and Whatman before ordering.
Use 0.45 µm when you need general particulate removal and faster flow for cleaner samples. Use 0.22 µm when you need finer clarification or sterile filtration goals. Many product lines (Fisherbrand, Merck Millex, Thermo Scientific and Sartorius) offer both pore sizes across multiple diameters.
Diameter affects filtration area and throughput. Smaller diameters like 13 mm are suited to low volumes and rapid checks, while 25–33 mm provides more area for higher volumes or more particulate-heavy samples. Consider your sample volume, viscosity and clogging risk, then choose from Whatman, Merck or Sartorius formats.
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