Home / Product / Filtration / Filter Papers / Qualitative Filter Paper / Standard
Filtration_banner

Standard Qualitative Filter Paper

Standard qualitative filter papers are used for gravity filtration due to the high level of alpha cellulose content. This means that the paper will weaken when wet. This makes this grade of filter paper unsuitable for any form of vacuum filtration.

Grade
Whatman Equivalent
301
= No.5
  • SpeedSlow
  • Filteration Speed (sec) 100
  • Thickness (mm) 0.17
  • Retention Capacity 2 - 3
  • Weight (g/m2) 75
  • Burst Strength (kg/cm2) Light
Grade 301
Grade 301 is a slow filtering paper with a high particle retention capacity. This makes this paper an excellent choice for clarifying liquids from precipitates such as Barium sulphate or Cuprous oxide. Grade 301 is also suitable for filtration applications in soil analysis.
Sizes (Diameter/mm)
Product Code
302
= No.3
  • SpeedMedium
  • Filteration Speed (sec) 22
  • Thickness (mm) 0.32
  • Retention Capacity 4 - 6
  • Weight (g/m2) 140
  • Burst Strength (kg/cm2) Light
Grade 302
Grade 302 is thicker than grade 304 and has a slightly higher retention capacity. This makes this paper slightly stronger when wet, making it particularly useful for the filtration of large volumes of liquid. Ideally suited for the filtration of dyes.
Sizes (Diameter/mm)
Product Code
303
= No.2
  • SpeedMedium / Slow
  • Filteration Speed (sec) 55
  • Thickness (mm) 0.20
  • Retention Capacity 4 - 7
  • Weight (g/m2) 85
  • Burst Strength (kg/cm2) Light
Grade 303
Grade 303 is slightly more retentive than grade 304 but has a slower filtration speed. This filter paper has a much higher absorbency which makes it suitable in environmental laboratories for plant growth trails.
Sizes (Diameter/mm)
Product Code
304
= No.1
  • SpeedMedium
  • Filteration Speed (sec) 22
  • Thickness (mm) 0.16
  • Retention Capacity 4 - 12
  • Weight (g/m2) 70
  • Burst Strength (kg/cm2) Light
Grade 304
The most used filter paper in laboratories or educational settings. A medium retention capacity and flow rate makes this filter paper ideal for many filtering applications.
Sizes (Diameter/mm)
Product Code
305
= No.4
  • SpeedFast
  • Filteration Speed (sec) 9
  • Thickness (mm) 0.20
  • Retention Capacity 7 - 12
  • Weight (g/m2) 85
  • Burst Strength (kg/cm2) Light
Grade 305
Grade 305 is an extremely fast filtering paper used for the filtration of coarse particles or gelatinous precipitates such as aluminium or magnesium hydroxides. Grade 305 can also be used for air or gas monitoring where high flow rates are required.
Sizes (Diameter/mm)
Product Code
306
= No.6
  • SpeedSlow
  • Filteration Speed (sec) 140
  • Thickness (mm) 0.17
  • Retention Capacity 2 - 4
  • Weight (g/m2) 85
  • Burst Strength (kg/cm2) Light
Grade 306
Grade 306 is slower than grade 301 but maintains a similar particle retention capacity.
Sizes (Diameter/mm)
Product Code
Grade Whatman
Equivalent		 Speed Filteration Speed
(sec)		 Thickness
(mm)		 Retention Capacity Weight
(g/m2)		 Burst Strength
(kg/cm2)
301 + = No.5 Slow 100 0.17 2 - 3 75 Light
302 + = No.3 Medium 22 0.32 4 - 6 140 Light
303 + = No.2 Medium / Slow 55 0.20 4 - 7 85 Light
304 + = No.1 Medium 22 0.16 4 - 12 70 Light
305 + = No.4 Fast 9 0.20 7 - 12 85 Light
306 + = No.6 Slow 140 0.17 2 - 4 85 Light