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Used commonly in quantitative and qualitative analysis, filter papers must be closely matched to the application according to the physical characteristics of the filter paper. There are many sizes, materials, types, and grades of filter paper available for a variety of applications. Whatman® filter papers use only the highest quality raw materials for high reproducibility and high uniformity. Whatman® cellulose filter papers are manufactured from high-quality cotton liners that are treated to achieve an α-cellulose content >98%. A wide selection of Whatman® filter papers are available to suit numerous laboratory applications. Pre-pleated (folded) filter paper is also available for convenience.
Filter housings are used in conjunction with cut disc membrane filters providing structural support and creating a seal around the membrane to prevent filtrate contamination. Reusable syringe filter holders are suited for filtering or clearing small amounts of liquid where a replaceable or removable filter is desired. Filter holders for vacuum and pressure filtration are available in a variety of formats and sizes to accommodate a range of filter diameters. Filter holder selection is dependent on the following criteria:
We provide bottle-top vacuum filtration and pressure filtration units for routine filtration of buffers, solvents and culture media, syringeless filters for HPLC and UHPLC sample preparation, pressure filter funnels for solute and compound drying, and analytical filter funnels for microbiological testing. Vacuum manifolds and in-line filter devices to help confine and isolate contaminants in vacuum systems are also available for convenience.