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.

Brand: Whatman™

Manufacturer Part Number: 1004-047

UNSPSC: 41104921

Additional Details:
Additional Details: Weight: 1.36080kg

Product Code. 11390444

Quantity Price
1 £ 4.640000000000001 / Pack of 100
Estimated Shipment
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Description and Specification


Particle Retention Coarse particles and gelatinous precipitates
Quantity 100Pack
Flow Rate Fast
Thickness (Metric) 210μm
Porosity Medium
Material Cellulose
Format Circle
Grade 4
Pore Size (Metric) 20 to 25μm
Diameter (Metric) 47mm


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