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Whatman™ Qualitative Filter Papers: Grade 4 Sheets

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

Manufacturer: whatman™  1004917

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Catalog No. 09-825P

  • / Pack of 100 Each

Description & Specifications


Quantity 100Pack
Grade 4
Length (Metric) 570mm
Width (Metric) 460mm
Thickness (Metric) 210μm
Pore Size (Metric) 20 to 25μm
Particle Retention Coarse particles and gelatinous precipitates
Flow Rate Fast
Format Sheet
Dimensions (L x W) 570 x 460mm


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: 09825P

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