Material Testing Laboratory Equipment

Whatman Filter Paper – Grade 1 Circles (Whatmans Grade 1)

SKU: WHATMANS GRADE 1 Categories: ,

These cellulose filters are used in qualitative analytical techniques to determine and identify materials.

CodeWhatmans Grade 1
  • Pre-pleated qualitative filters are also available, which give improved flow rate and increased loading capacity compared to equivalent flat filters.

Grade 1 (11 µm):

  • The most widely used filter paper for routine applications with medium retention and flow rate.
  • Extended range of sizes includes 10 to 500 mm diameter circles and 460 x 570 mm sheets.
  • This filter is also available in the Filter Cup, this is a convenient, disposable 70 mm filter funnel with a 250 ml capacity moulded from polypropylene with an integral, heat bonded filter (catalogue number 1600-001).
  • This grade covers a wide range of laboratory applications and is frequently used for clarifying liquids.
  • Traditionally the grade is used in qualitative analytical separations for precipitates such as lead sulphate, calcium oxalate (hot), and calcium carbonate.
  • In agriculture, it is used for soil analysis and seed testing procedures.
  • In the food industry, Grade 1 is used for numerous routine techniques to separate solid foodstuffs from associated liquid or extracting liquid and is widely used in education for teaching simple qualitative analytical separations.
  • In air pollution monitoring, using circles or rolls, atmospheric dust is collected from airflow and the stain-intensity measured photometrically.
  • For gas detection, the paper is impregnated with a chromogenic reagent and colour formation quantified by optical reflectance.

Available in the following Sizes:

  • 18mm (100 P/Box)
  • 20mm (100 P/Box)
  • 25mm (100 P/Box)
  • 30mm (100 P/Box)
  • 47mm (100 P/Box)
  • 55mm (100 P/Box)
  • 70mm (100 P/Box)
  • 85mm (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)
  • 270mm (100 P/Box)
  • 320mm (100 P/Box)
  • 400mm (100 P/Box)
  • 500mm (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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