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Whatman™ Qualitative Filter Paper: Grade 4 Circles

Filters and retains course particles for monitoring air pollution. Whatman™ Qualitative Filter Paper: Grade 4 Circles are used when high flow rates in air pollution monitoring are required and the collection of fine particles is not critical.

Manufacturer: whatman™  WHT1004070

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Catalog No. 09-825A

  • / Pack of 100 Each

Description & Specifications


Porosity Medium
Quantity 100Pack
Pore Size (Metric) 20 to 25μm
Material Cellulose
Flow Rate Fast
Thickness (Metric) 210μm
Particle Retention Coarse particles and gelatinous precipitates
Format Circle
Grade 4
Diameter (Metric) 70mm


These cellulose filters are used in qualitative analytical techniques to determine and identify materials and for clarifying liquids. 
  • Particle Retention: 25μm
  • Porosity: Coarse
  • Filtration speed: Herzberg, 37 sec.
  • Surface: smooth
  • Extremely fast filtering  with excellent retention of coarse particles and gelatinous precipitates such as ferric hydroxide and aluminum hydroxide
  • Useful as a rapid filter for routine clean-up of biological fluids or organic extracts during analysis


Accessories for Catalog Number: 09825A

Item Mfr. No. Item Description Price Per Unit Quantity  
Fisherbrand™ Filter Forceps
Easy, effortless handling of membranes and glass fiber filters Each for $11.07