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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.

$16.88 - $397.15

Specifications

Grade 4
Pore Size (Metric) 20 to 25μm
Particle Retention Coarse particles and gelatinous precipitates
Format Circle
Material Cellulose
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Products
Catalog Number Mfr. No. Diameter (Metric) Price Quantity    

09-825B

  Accessories
whatman™
1004090
90mm Pack of 100 Each for $26.65

09-825A

  Accessories
whatman™
1004070
70mm Pack of 100 Each for $21.71

09-825C

  Accessories
whatman™
1004110
110mm Pack of 100 Each for $33.71

09-825D

  Accessories
whatman™
1004125
125mm Pack of 100 Each for $43.46

09-825E

 
whatman™
1004150
150mm Pack of 100 Each for $55.29

09-825F

  Accessories
whatman™
1004185
185mm Pack of 100 Each for $82.00

09-825L

 
whatman™
1004270
270mm Pack of 100 Each for $183.19

09-825G

  Accessories
whatman™
1004240
240mm Pack of 100 Each for $139.75

09-825J

  Accessories
whatman™
1004042
42.5mm Pack of 100 Each for $16.88

09-825K

  Accessories
whatman™
1004055
55mm Pack of 100 Each for $21.71

09-825H

  Accessories
whatman™
1004320
320mm Pack of 100 Each for $263.17

09-825M

  Accessories
whatman™
1004400
400mm Pack of 100 Each for $397.15
Description & Specifications

Specifications

Grade 4
Pore Size (Metric) 20 to 25μm
Particle Retention Coarse particles and gelatinous precipitates
Format Circle
Material Cellulose

 

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