page_title: Syringe filter
section_title: Forms
hierarchical_section_title: Syringe filter / Forms
caption_attribution_description: English: B-D 5 micron filter needle with Luer-Lock type screw in base for syringe attachment. If you look close, you will see a round white patch inside of the translucent purple hub - this is the “filter.” http://en.wikipedia.org/wiki/Syringe_filter
context_page_description: A syringe filter is a single-use filter cartridge. It is attached to the end of a syringe for use. Syringe filters may have Luer lock fittings, though not universally so. The use of a needle is optional; where desired it may be fitted to the end of the syringe filter.
  A syringe filter generally consists of a plastic housing with a membrane that serves as a filter. The fluid to be purified may be cleaned by drawing it up the syringe through the filter, or by forcing the unfiltered fluid through the filter.
context_section_description: In scientific applications, the most common sizes available are 0.2 or 0.22 µm and 0.45 µm pores. These sizes are sufficient for HPLC use. The smallest known sterile syringe microfilter have pore sizes of 0.02 µm. Membrane diameters of 10 mm, 13 mm, 25 mm are common as well. Some syringe filters for small volumes may not resemble a wheel at all.
  The syringe filter body may be made of such materials as polypropylene and nylon. The filter membrane may be of PTFE, nylon, or other treated products for specific purposes. Most manufacturers publish compatibility wallcharts advising users of compatibility between their products and organic solvents or corrosive liquids (e.g. trifluoroacetic acid).
caption: Close up view of a 5 µm filter needle. The filter is visible as the white, round disk on the left hand side.
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