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Whatman
Quantitative Filter Paper-Grade 540: 8 μm
Grade 540: 8 μm
A general purpose hardened ashless filter paper with medium retention and flow rate.
Extremely pure and strong with a hard surface. High chemical resistance to strong acid and alkali.Frequently used in the gravimetric analysis of metals in acid/alkali solutions
and in collecting hydroxides after precipitation by strong alkalis.SKU: n/a -
Whatman
Quantitative Filter Papers-Grade Grade 50: 2.7μm
Grade 50: 2.7 μm*
Retention of very fine crystalline precipitates.The thinnest of all Whatman filter papers with a slow flow rate, these filters have a hardened and highly glazed surface, which also keeps the paper free from loose surface fibers.
Highly suitable for
qualitative or quantitative filtrations requiring vacuum assistance on Büchner
or 3-piece filter funnels.Very strong when wet and will withstand wet handling and
precipitate removal by scraping.In the electronics industry, the virtual absence of
fiber shedding is utilized in carriers for integrated circuits.This grade is also available in Smear Tab format for wipe testing (e.g. testing of
surfaces for radionuclide contamination).SKU: n/a -
Whatman
Quantitative Filter Papers-Grade 43: 16μm
Grade 43: 16 μm*
Intermediate in retention between Grades 40 and 41, and twice as fast as Grade 40.Typical applications include foodstuffs analysis, soil analysis, particle collection in
air pollution monitoring for subsequent analysis by XRF techniques, and inorganic
analysis in the construction, mining, and steel industries.SKU: n/a -
Whatman
Quantitative Filter Papers-Grade 42: 2.5μm
Grade 42: 2.5 μm*(Ashless Grades)
Used for critical gravimetric analysis with the finest particle retention of all
Whatman cellulose filter papers.Typical analytical precipitates include barium sulfate, metastannic acid, and finely precipitated calcium carbonate.
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Whatman
Quantitative Filter Papers-Grade 41: 20μm
Grade 41: 20 μm*
The fastest ashless filter paper, recommended for analytical procedures involving coarse particles or gelatinous precipitates (e.g. iron or aluminum hydroxides).Also used in quantitative air pollution analysis as a paper tape for impregnation when
determining gaseous compounds at high flow rates.SKU: n/a -
Whatman
Quantitative Filter Papers-Grade 40: 8μm
Grade 40: 8 μm*
The classic general purpose ashless filter paper with medium speed and retention.
Typical applications include gravimetric analysis for numerous components in cements,clays, iron, and steel products; as a primary filter for separating solid matter from aqueous extracts in general soil analysis; quantitative determination of sediments in milk, and as a pure analytical grade clean-up filter for solutions prior to AA
spectrometry.Also used as a high-purity filter in the collection of trace elements and radionuclides from the atmosphere.
SKU: n/a -
Whatman
Mixed Cellulose Ester Membranes-Plain ME 24, Gridded
Whatman gridded filters have clearly defined grid lines spaced at 3.1 or 5 mm intervals.
The special ink used is nontoxic and completely
free from bacterial growth inhibitors.Whatman black mixed cellulose esters are available plain for automatic colony
counting applications, as well as gridded to assist in manual counting procedures.Black membranes provide contrast between residue or cell colors and the filter
without having to counter-stain the membrane.SKU: n/a -
Whatman
Nuclepore Track-Etched PC Membranes
Nuclepore track-etched polycarbonate membranes are manufactured from high-quality polycarbonate film and have sharply defined pore sizes, high flow rates, and excellent chemical and thermal resistance.
The membranes have a smooth flat surface and exhibit very low levels of extractables.
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Whatman
Qualitative Filter Papers-Grade 93: 10 μm
Grade 93: 10 μm*
This filter paper is intermediate in speed and retention between Grades 1 and 4.Available in a dispenser pack, which can be attached to the wall or bench, placed on a
shelf either upright or flat, and used as a normal carton or as a convenient dispenser.The envelopes are released individually for easy one-at-a-time removal.
Package and envelopes are clearly marked for size and content.
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