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  • Z241091 - Whatman® quantitative filter paper, ashless, Grade 42

Z241091 Aldrich

Whatman® quantitative filter paper, ashless, Grade 42

circles, diam. 90 mm, pack of 100

Synonym: Whatman paper, filter papers, paper filter

  •  eCl@ss 32110215



Related Categories Filtration Supplies, Labware, Manufacturer Browser, Paper Filters, Quantitative,
material   circles
  cotton filters (high-quality cotton linters)
packaging   pack of 100
mfr. no.   Whatman Article No., 28418042 (US reference)
  Whatman, 1442-090
parameter   0.40 psi wet burst
  1870 sec/100 mL speed (Herzberg)
diam.   90 mm
thickness   200 μm
ash   ≤0.007%
pore size   2.5 μm (Particle retention)
basis weight   100 g/m2


General description

Whatman quantitative filters are designed for gravimetric analysis and the preparation of samples for instrumental analysis. They are available in three formats designed to meet your specific needs.

: 0.007% ash maximum for Grades 40 to 44 and a maximum of 0.01% for the 589 Grades - very pure filters suitable for a wide range of critical analytical filtration procedures.

Hardened low ash
: 0.015% ash maximum - treated with a strong acid to remove trace metals and produce high wet strength and chemical resistance. These filters are particularly suitable for Büchner filtration where the tough smooth surface of the filter makes it easy to recover precipitates.

Hardened ashless:
0.006% ash maximum - acid hardened to give high wet strength and chemical resistance with extremely low ash content. The tough surface makes these filters suitable for a wide range of critical filtration procedures.

Grade 42: 2.5 μm (slow filter paper)

A world standard 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.

Other Notes

Global SIAL customers (excluding Japan) can now order any product from the GE Healthcare Life Sciences consumables portfolio (prepack only) using GE′s product numbering system.

The legacy GE Whatman products that use the SIAL "Z" product numbering system will be discontinued and directly replaced with a product number using a "WHA" prefix plus the GE product code. For reference, the legacy "Z" product number is identified as a synonym on the "WHA" product number listing.

This product has been replaced by WHA1442090-ALDRICH | Whatman quantitative filter paper, ashless, Grade 42, circles, diam. 90 mm, pack of 100

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Whatman is a registered trademark of GE Healthcare

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WHA1442090 Whatman® quantitative filter paper, ashless, Grade 42, circles, diam. 90 mm, pack of 100

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