GD/XP 25 Syringe Filter, 0,45 µm, 25 mm Whatman™ GD/XP disposable syringe filters are suitable for use with samples that require inorganic ion analysis, as levels of ion extractables are minimized. They are also an alternative choice for users requiring a filter that exhibits extremely low protein binding characteristics. GD/XP syringe filters contain a two-layer prefilter stack comprised of 20 μm and 5 μm polypropylene filters. The last stage of filtration is by membrane, which is positioned below the prefilter stack.
Grade 202 Qualitative Filter Paper Circles, 15 - 19 µm, 100/pk A general qualitative filter with creped surface. Faster than grade 201 and retain large crystalline coarse particles. Widely used in industrial laboratories and students laboratories for routine filtration. Filters coarse particles.The filter is wet-strengthened with a small amount of chemically stable resin to extend the life of the filter and improve handling. Normal qualitative applications will not introduce any significant impurities into the filtrate. However it is not recommended for Kjeldahl nitrogen analysis.
WCN Membrane Circles, Cellulose Nitrate, White Plain Recommended for most routine applications, this membrane is manufactured under strictly controlled conditions. Whatman™ nitrocellulose membranes are known for higher strength and flexibility, low extractables and narrow pore size distribution.
Filter Funnel Plate, polypropylene, 90 mm Polypropylene Plate: Optional extra. Recommended for most acids (except concentrated nitric acid and fuming sulfuric acid) at room temperatures. Suitable also for most alcohols, glycols, ethers, and ketones. Maximum working temperature 100°C.
Grade 54 Quantitative Filter Papers, 22 µm, 100/pk Very fast filtration and high wet strength makes this grade very suitable for vacuum assisted fast filtration of difficult coarse or gelatinous precipitates. The maximum ash content of these grades is intermediate between ashless and qualitative grades. They are particularly suitable for Büchner filtrations where it is desirable to recover the precipitate from the filter surface after filtration. Other characteristics include high wet strength and chemical resistance, which are similar to the acid hardened ashless filter papers.
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