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: 1004-185

UNSPSC: 41104929

Code: 69

Additional Details:
Additional Details: Weight: 0.30000kg

Product Code. 10419691

Quantity Price
1 £ 43.75 / Pack of 100
10 £ 35.0 / Pack of 100
In Stock 17
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  • Description and Specification
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  • Documentation
Description and Specification


Porosity Medium
Pore Size (Metric) 20 to 25μm
Quantity 100Pack
Flow Rate Fast
Thickness (Metric) 210μm
Material Cellulose
Particle Retention Coarse particles and gelatinous precipitates
Diameter (Metric) 185mm
Format Circle
Grade 4


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

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