Quantitative Ashless Filter Paper Grade: BIO-41

Grade: BIO-41
Filtration Speed: Fast flow
Product Appearance: Smooth
Particle Retention: 20 μm
Ash Content(%): <0.007
Basis Weight(g/m²): 84
Thickness(mm): 215
Wet Burst(psi): 0.3

Availability: In Stock


Description of Ashless Filter Paper Grade 41

Hawach BIO-41 ashless filter paper is a star product equivalent to Whatman’s Grade 41 with a more competitive price, which has a low retention rate and fast flow rate (20-25μm).

Ashless filter paper in the manufacturing process, the pulp is treated with hydrochloric acid and hydrofluoric acid and washed with distilled water to remove most of the impurities in the paper fiber, so there is little residual ash after burning, which has little effect on the analysis results. It is important to filter paper for laboratory use.

BIO-41 filter paper is the filtration of large particles or gel deposits. Ashless filter paper is also used for rapid flow rate determination of gaseous compounds in quantitative air pollution analysis. The difference between grade 40 medium flow filter paper, quantitative filter paper grade 41 has a fast filtration speed.

ashless filter paper garde 41

Features of Filter Paper Grade 41

  • Filter paper for laboratory use;
  • Ash-free (ash content < 0.007%);
  • The basic weight is 104 (g/m2);
  • Wet burst >108 (mm H2O);
  • Particularly useful for gravimetric analysis use;
  • Fast filtration speed and the nominal particle retention rating of 20-25μm;
  • Equivalent to Whatman filter paper 41.

Advantages of Ashless Filter Paper 41

  • ISO9001 & CE double approved;
  • High purity and consistent performance;
  • Full range of diameter, customized size, and shape are available;
  • Made of 100 % cotton linters, 5 different quantitative ashless filter paper grades for nearly every need;
  • With the fast flow rate.


  • Determination of gas compounds;
  • Precise quantitative analysis;
  • Quantitative determination of milk sediment;
  • Filter coarse particles and gel precipitates;
  • Filtration of large particles or gel deposits;
  • Environmental analysis of air pollution, waste, and water;
  • During the analysis of aluminum hydroxide or iron hydride;
  • Preparation of samples for instrumental analysis;
  • Recommended for analytical processes such as aluminum hydroxide or iron hydride;
  • Specific gravity analysis of air pollution when impregnated with slag for rapid;
  • Rapid flow rate determination of gaseous compounds in quantitative air pollution analysis.

Grade Comparison

Hawach Scientific Co., LtdWhatmanAdvantecMunktellAhlstromMacherey Nagel
BIO-41Grade 41700M/389n/a640m

Guide for Filter Paper


Technical Data

Ash Content
Basis Weight
Wet Burst
(mm H2O)
BIO-4120-25 μmSmoothFast< 0.007104> 180

Ordering Information

Item #DescriptionPore SizeDiameterPackage
BIO-41-055Grade 41, fast flow rate20-25 μm55mm100pcs/pk
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