QUANTITATIVE FILTER PAPER

Whatman quantitative filter paper and Pall quantitative filter paper

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VWRbrand®

Grade No. 454 - Medium porosity, medium fast flow rate, with a 10µm size particle retention. For use in filtration of coarse and gelatinous precipitates. Available diameter sizes range from 5.5cm to 18.5cm in packs of 100.

Grade No. 474 - Medium fine porosity, medium slow flow rate, with a 2µm size particle retention. For general quantitative analyses. Available diameters range from 5.5cm to 15cm in packs of 100.

Grade No. 494 - Fine porosity, slow flow rate, with a 1µm size particle retention. Used in the filtration of very fine metallic precipitates. Available diameters are 9cm and 12.5cm in packs of 100.

WHATMAN©

Grade No. 40 Ashless - Medium porosity, medium flow rate, with an 8µm size particle retention. Often used for the filtration of rare earth metals and gravimetric analyses. Available diameter sizes range from 4.25cm thru 32cm, in packs of 100.

Grade No. 41 Ashless - Coarse porosity, fast flow rate, with a 20µm-25µm size particle retention. Suited for air pollution analysis, metal oxide analyses and gelatinous precipitate analyses. Available diamters range from 4.25cm to 24cm, in packs of 100.

Grade No. 42 Ashless - Fine porosity, slow flow rate, with a 2.5µm size particle retention. Widely used for colloidal precipitate analyses, suction filtartion, and gravimetric analyses. Available diamter sizes range from 4.25cm to 24cm, in packs of 100.

Grade No. 43 Ashless - Fine porosity, fast flow rate, with a 16µm size particle retention. Widely used in food, soil, and air analyses. Also used in inorganic analyses in the mining and steel industries. Retention is median between No. 40 and No. 41, with twice the flow rate of No. 40. Available diameter sizes range from 11cm to 18.5cm, in packs of 100.

Grade No.44 Ashless - Fine porosity, medium flow rate, with a 3µm size particle retention. A thinner version of Grade No. 42, yet with higher flow rate. Available diameter sizes range from 11cm to 18.5cm, in packs of 100.

Grade No. 50 - Fine porosity, slow flow rate, with a 2.7µm size particle retention. Hardened with low ash. Well suited for the filtration of biological solutions. Has a smooth hard surface.Available diameter sizes range from 4.25cm to 50cm, in packs of 100.

Grade No. 54 - Coarse porosity, fast flow rate, with a 20-25µm size particle retention. Well suited for coarse and gelatinous precipitates. Available diameter sizes range from 5.5cm to 24cm, in packs of 100.

Grade No. 541 Hardened Ashless - Coarse porosity, fast flow rate, with a 20-25µm size particle retention. Used for gelatinous and coarse particle precipitates from alkaline solutions. Manufactured for high resistance to acidic and alkaline solutions. High wet strngth and high purity. Available diameter sizes range from 4.25cm to 50cm, as well as 46cm x 57cm sheets, in packs of 100.

No. 1 PS Water Repellent Phase Separating - Medium porosity, medium flow rate, with medium particle retention. Well suited for use as a phase separator, separating aqueous solutions from water immiscible solutions without the need for waiting for separations to occur. Available diameter sizes range from 9cm to 27cm, in packs of 100.

Grade No. 540 Hardened Ashless ~ For Gooch Crucibles- Medium porosity, medium flow rate, with an 8µm size particle retention. Routinely used for the gravimetric analyses of metals in acidic and alkaline solutions. Highest purity and strength. Available diameter sizes range from 2.1cm to 32cm, in packs of 100.

EPM 2000 High Volume Air Sampling Filter Paper- 99.99% efficiency in air for 0.3µm particles at 5cm/sec flow rate. Manufactured specifically for use in high volume air samplers (220m³/min). Sheets are individually numbered. Available as 4.7cm diameter circular discs or as a 20.32cm x 25.4cm (8" x 10") sheet, both in packs of 100.