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Hardened Ashless Quantitative Filter Paper

Hardened ashless grade filter papers are further wet strengthened to ensure maximum working rigidity. These filter papers are specifically suited for applications that require filtered samples to be removed from the filter, for example with a jet of water.

Grade
Whatman Equivalent
371
= No.50
  • SpeedSlow
  • Filteration Speed (sec) 200
  • Thickness (mm) 0.14
  • Retention Capacity < 2
  • Weight (g/m2) 90
  • Burst Strength (kg/cm2) Light
Grade 371
Grade 371 has a slow speed, high retention capacity and high chemical resistance making it ideally suited for the most demanding applications.
Sizes (Diameter/mm)
Product Code
372
= No.52
  • SpeedMedium
  • Filteration Speed (sec) 170
  • Thickness (mm) 0.16
  • Retention Capacity 4 - 12
  • Weight (g/m2) 90
  • Burst Strength (kg/cm2) Light
Grade 372
Grade 372 is the most suited paper for general purpose applications where filtration speed is not important. With a high chemical resistance, this paper is frequently used in gravimetric analysis of metals from acid/alkali solutions.
Sizes (Diameter/mm)
Product Code
373
= No.54
  • SpeedFast
  • Filteration Speed (sec) 50
  • Thickness (mm) 0.17
  • Retention Capacity 12 - 25
  • Weight (g/m2) 88
  • Burst Strength (kg/cm2) > 0.3
Grade 373
Grade 373 is very fast and best suited for filtering coarse particles or gelatinous precipitates.
Sizes (Diameter/mm)
Product Code
Grade Whatman
Equivalent		 Speed Filteration Speed
(sec)		 Thickness
(mm)		 Retention Capacity Weight
(g/m2)		 Burst Strength
(kg/cm2)
371 + = No.50 Slow 200 0.14 < 2 90 Light
372 + = No.52 Medium 170 0.16 4 - 12 90 Light
373 + = No.54 Fast 50 0.17 12 - 25 88 > 0.3