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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.

$16.48 - $387.13

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™
1004-090
90mm Pack of 100 Each for $26.00

09-825A

  Accessories
whatman™
1004-070
70mm Pack of 100 Each for $21.19

09-825C

  Accessories
whatman™
1004-110
110mm Pack of 100 Each for $32.92

09-825D

  Accessories
whatman™
1004-125
125mm Pack of 100 Each for $42.44

09-825E

 
whatman™
1004-150
150mm Pack of 100 Each for $54.02

09-825F

  Accessories
whatman™
1004-185
185mm Pack of 100 Each for $80.08

09-825L

 
whatman™
1004-270
270mm Pack of 100 Each for $178.94

09-825G

  Accessories
whatman™
1004-240
240mm Pack of 100 Each for $136.52

09-825J

  Accessories
whatman™
1004-042
42.5mm Pack of 100 Each for $16.48

09-825K

  Accessories
whatman™
1004-055
55mm Pack of 100 Each for $21.19

09-825H

  Accessories
whatman™
1004-320
320mm Pack of 100 Each for $257.08

09-825M

  Accessories
whatman™
1004-400
400mm Pack of 100 Each for $387.13
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