Material Testing Laboratory Equipment

Whatman Filter Paper – Grade 40 Circles (Whatmans Grade 40)

SKU: WHATMANS GRADE 40 Categories: ,

Whatman quantitative filters are designed for gravimetric analysis and the preparation of samples for instrumental analysis.

CodeWhatmans Grade 40
  • They are available in three formats designed to meet your specific needs.
  • Ash-less: 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 ash-less: 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):

  • The classic general-purpose ash-less 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.

Available in the following Sizes:

  • 32mm (100 P/Box)
  • 47mm (100 P/Box)
  • 55mm (100 P/Box)
  • 70mm (100 P/Box)
  • 90mm (100 P/Box)
  • 110mm (100 P/Box)
  • 125mm (100 P/Box)
  • 150mm (100 P/Box)
  • 185mm (100 P/Box)
  • 240mm (100 P/Box)

Due to the continuous development of our products, the goods supplied may vary in detail to that illustrated on this Website.

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