Introduces the 20 Micron Filter Paper in a Comprehensive Way

To understand the role of 20 micron filter paper, you must first understand what lab filter paper is. Generally, cotton filters are the main materials, which can be made in different ways to meet different purposes.

Because its material is made of fiber, there are countless small holes on its surface for liquid particles to pass through, but larger solid particles cannot pass. This property allows the mix of liquid and solid materials to separate. Today HAWACH will provide a brief introduction to the role of 20 micron filter paper, classifications, and some other basic properties.

The role of 20 micron filter paper

Because the cotton fiber in the lab 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. In most cases, paper chromatography is to remove the lab filter paper fiber. Bound water is used as the stationary phase, and the mobile phase is dominated by organic solvents. When the mobile phase of the organic solvent passes through the sample, the water, and the organic phase are continuously distributed, and then as the mobile phase continues to move, the substances of various components are continuously redistributed, further separating and purifying the substances. This is commonly used in chemical laboratories.

In addition to the application of 20 micron filter paper in chemical experiments, there are also lab filter paper applications in our lives. Under normal circumstances, this 20 micron filter paper has a high degree of softness. In industry, 20 micron filter paper is generally used to adsorb suspended particles in the air.

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Basic properties of 20 micron filter paper

There are four factors to consider if you want to find a suitable 20 micron filter paper.

The first is the hardness. The 20 micron filter paper will be wetted during filtration. Therefore, in the long-term filtration process, you should choose a tougher lab filter paper.

The second is its filtration efficiency. The filtration efficiency is mainly determined by the tightness of the water seepage holes on the 20 micron filter paper and the size of the holes.

The third one is capacity. The capacity is mainly determined by the density of the small holes that seep water. The denser the holes, the higher it’s capacity. The last is applicability. Some lab filter paper production steps are very special, so you must pay attention to it when applying.

Selection factors of 20 micron filter paper

The following factors should be considered when purchasing the filter pater.
1. The effective area: the effective area is in direct proportion to the dust holding capacity and service life, and is inversely proportional to the resistance. The cost will be higher than the others.
2. To achieve a better interception effect and higher filtration efficiency, the fiber diameter should be small.
3. The higher the binder content and tensile strength of the paper, so the higher the filtration efficiency, the less lint phenomenon, and the less dust accumulate in the filter material.

20 micron filter paper operation process

1. You should press the folded 20 micron filter paper into three layers on one side and one layer on the other side to form a funnel.
2. The edge of the lab filter paper should be lower than the edge of the funnel. Pour some clean water into the funnel mouth to make the soaked lab filter paper abut the inner wall of the funnel, then pour out the remaining clean water and set aside.
3. Place the beaker or test tube that receives the filtrate under the funnel neck and make the tip of the funnel neck lean against the wall of the receiving container.
4. The lower end of the glass rod is close to the lower surface of the third layer of the funnel, so that the cup mouth is close to the glass rod, and along with the cup, mouth flows out the filtered liquid. And then tilt along the glass rod and flow into the funnel.
5. As the liquid flows down the neck of the funnel through the 20 micron filter paper, check whether the liquid flows down the side of the cup and into the bottom of the cup.

Otherwise, you should move the beaker or rotate the funnel so that the tip of the funnel is firmly connected to the wall of the beaker so that the liquid can flow slowly onto the inner wall of the beaker.


  1. Particle Filtration:
    • The primary application of 20 micron filter paper is the filtration of particles from liquids. It is effective in capturing particles with dimensions larger than the nominal pore size.
  2. Clarification:
    • 20 micron filter paper is commonly used for the clarification of liquids by removing suspended solids. This is important in processes where a clear filtrate is required.
  3. Quality Control:
    • In laboratories, 20 micron filter paper can be used in quality control processes to ensure the removal of particulate matter from liquids used in experiments or analyses.
  4. Environmental Monitoring:
    • Filter papers with a 20 micron pore size can be employed in environmental monitoring to filter water samples and analyze particulate content.
  5. Oil Filtration:
    • In some industrial applications, 20 micron filter paper is utilized for the filtration of oils to remove contaminants and extend the life of machinery.
  6. Chemical Filtration:
    • For chemical processes, 20 micron filter paper can be used to filter chemical solutions, ensuring that only the desired components pass through.

The above is the introduction of the relevant knowledge of the role of 20 micron filter paper and the correct use of classified 20 lab filter paper. Hawach also provides filter papers of 2.5um, 3um, 8um, 11um, 10um, 16um, 20um, 30umd, and other sizes. For more filter paper information, welcome to visit