Extractables found in the Filtrate of a Syringe Filter (or other devices) is any chemical / foreign body present in your sample after filtering that wasn’t there before. This would indicate the Filter as the source and usually it’s the Filter Membrane.
Occasionally, Extractables from the polypropylene housing can occur depending on the solvent being Filtered.
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MicroSolv Filters Equivalency to Market Leaders pdf 26.9 Kb Download File