To List the Features and Use Notes of the Hawach Filter Papers

About Hawach
Hawach takes “focusing on life sciences and developing scientific research technology” as the central concept to provide scientists, reagents, consumables, antibodies, instruments, etc. in the fields of molecular biology, cell biology, immunology, proteomics, clinical diagnosis, etc.

Whether it is in an ordinary laboratory or a research laboratory, the filtration device is an indispensable instrument in chemical analysis, and its accuracy directly affects the test results. During the operation process, the operator first thinks of a high-precision, full-featured, and easy-to-use appliance. The following shows the features of Hawach 20 micron filter paper BIO-4, which is well-known for its high quality and reliability. Welcome to contact Hawach team to learn more.


Hawach filter paper
As a specialized grade BIO-4 micron filter manufacturer, Hawach has an extensive grade 4 micron filter paper production line, and each 20 micron filter paper BIO-4 has its own unique features, so that customers can choose the most optimized one according to their own filtration requirements.

Hawach uses the highest quality natural materials to ensure that each micron filter paper produced maintains consistent high quality, reproducibility and uniformity. Each filter paper undergoes rigorous testing before leaving the factory, including weight, thickness, gas flow rate and mechanical strength. In addition, individual parameters, such as particle retention, capillary action rate, filtration characteristics and apparent characteristics, can also be determined as needed.

Qualitative filter paper
Standard grade qualitative filter paper
Hawach qualitative filter paper is used to identify the nature of substances in qualitative analysis techniques. Compared with the flat 20 micron filter paper of the same model, the folded qualitative filter paper accelerates the flow rate and increases the load.

Wet strength qualitative filter paper
This type of filter paper is very tough and has a high wet strength. In ordinary qualitative applications, no obvious impurities will be introduced. Note that it cannot be used for Kjeldahl determination.


Quantitative filter paper
Quantitative filter paper is an ordinary qualitative micron filter paper that is acidified to remove inorganic salts contained in the paper. After burning, the amount of residue is less than that of ordinary filter paper. In quantitative analysis, the weight of filter paper residue can be ignored.

Ashless quantitative filter paper
The ash content is extremely small, for example the grade 40 ~ 44 <0.007% very pure filter paper, which is the ideal paper for most of the main analysis filtration process.

Ash-free hardening quantitative filter paper
This series of filter paper has high strength and extremely low ash content (<0.006%). It is known as the cleanest analytical filter paper in the world. The tough surface makes this type of filter paper suitable for various strict filtration steps, and each level takes into account the filtration speed and particle retention.

Low gray hardening quantitative filter paper
The ash content is between ashless filter paper and qualitative filter paper (<0.015%). After strong acid treatment, trace metals are removed, resulting in high wet strength and chemical resistance. These filter papers are particularly suitable for Buchner funnels. The smooth surface makes it easy to recover the sediment.