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Z241318 Aldrich

Whatman® quantitative filter paper, ashless, Grade 40

circles, diam. 150 mm, pack of 100

Synonym: Whatman filter, Whatman paper, filter papers, paper filter

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Properties

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., 28417995 (US reference)
  Whatman, 1440-150
parameter   0.29 psi wet burst
  340 sec/100 mL speed (Herzberg)
diam.   150 mm
thickness   210 μm
ash   ≤0.007%
pore size   8 μm (Particle retention)
basis weight   95 g/m2

Description

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.

Ashless:
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 40: 8 μm (medium flow filter paper)

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.

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 WHA1440150-ALDRICH | Whatman quantitative filter paper, ashless, Grade 40, circles, diam. 150 mm, pack of 100

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Whatman is a registered trademark of GE Healthcare

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WHA1440150 Whatman® quantitative filter paper, ashless, Grade 40, circles, diam. 150 mm, pack of 100

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