Hawach BIO 44 cellulose filter paper is a star product equivalent to Whatman Grade 44 with a more competitive price, pore size 3 micron, which has a high retention rate and a slow flow rate. Regardless of the size, BIO-44 has lower ash than others in this series. The efficiency of collecting small particles is slightly lower than that of 2.5 micron filter paper BIO-42, but the flow rate is faster.
Because the cotton fiber in the filter paper has a good affinity with water, it can absorb about 22% of water, of which 6% to 7% of water is combined with cellulose in the form of hydrogen bonds. In general, it is very difficult to remove. Compared with the affinity with water, the affinity of the cotton fiber in the cellulose filter papers with the organic solvent is weaker.
Therefore, in most cases, the paper chromatography method uses the bound water in the filter paper fibers as the stationary phase, and the mobile phase is based on organic solvents. When the mobile phase of the organic solvent passes through the sample, it will continuously distribute the water and the organic phase, and then as the mobile phase continues to move, the substances of various components are continuously redistributed, which further enables the substances to be separated and purified. This use of filter paper is generally common in chemical laboratories.
Features of Cellulose Filter Paper
Pore size: 3 micron;
Equivalent to Whatman Grade 44;
High-purity filters contain 0.009% maximum ash content.
Advantages of Lab Filter Paper Grade 44
Passed by ISO9001 & CE double approved.
3 micron filter paper is manufactured from alpha-cellulose and high-cotton linters.
Laboratory apparatus filter paper.
Lowest ashless content: < 0.007%.
Keep very fine particles.
High purity and consistent performance, the quality is equivalent to Whatman, and the price is more competitive.
Use for laboratory apparatus;
Particularly useful for gravimetric analysis;
Ideal for a variety of important analytical filtration steps.
Hawach Scientific Co., Ltd
Guide for Filter Paper
Ash Content (%)
Basis Weight (g/m2)
Wet Burst (mm H2O)
Grade 44, Slow flow rate
Enter your email address and our sales staff will contact you as soon as possible.