A Brief Introduction to Hawach Qualitative Filter Papers

Qualitative filter papers usually apply to filter at atmospheric pressure, which uses the ability of the material to remove particles to separate the liquid and solid of the sample. It covers most of the laboratory applications, is used commonly for liquid clarification and, sometimes, for qualitative analysis and purification of the deposits.

In the industrial filtration, it is commonly used to separate solids or extract liquids from solution as a filter material, not as chemical analysis filter paper. The Hawach qualitative filter paper has two categories: standard grade products and wet strength grade products. Users can select from either product depending on their requirements.

Standard Grade qualitative filter papers

Standard grade qualitative filter paper is frequently used in conventional filtration. There are several models of its different particle retentions and filtration speeds.

Usually, the slow filtration speed ones which have stronger separation ability by high adsorption are suited for the chemical analysis. In industrial, medium particle retention, medium filtration Speed models are especially suits to the analysis. Besides, the fast filter paper is thicker and has a higher load which can be used for filtering culture media and colloid substances.

Product parameters of standard grade qualitative filter paper

Qualitative Filter Paper Disc Grade: BIO-1, Qualitative Laboratory Filtration Filter Paper Grade: BIO-2, Qualitative 20 Micron Filter Paper Grade: BIO-4, Qualitative Chromatography Filter Paper Grade: BIO-5, Qualitative Filter Paper Biology Grade: BIO-6

Wet Strength grade qualitative filter papers

The wet strengthened qualitative filter paper belongs to the qualitative filter paper but the one with high wet strength. The surface of it is either smooth or wrinkled. There are two or three different flow rates provided for selection. Unlike all the other kinds of filter papers, it contains a very small amount of chemically stable resin, which would not bring any obvious impurities into the sample solutions.

Considering some special requirements of users, Hawach developed wet strength qualitative filter paper on the basis of standard grade products. The chemical stabilizer was added to the materials of this kind of filter paper to improve the breaking resistance significantly. However, wet strength is not recommended for Kjeldahl nitrogen determination for the nitrogen elements from the chemical stabilizer. Users can select any model to meet your specific needs.

The wet strengthened qualitative filter paper could ensure an excellent filtration performance. However, it is not supposed to be used for Kjeldahl nitrogen determination, due to the nitrogen content included in its resin. Since it is strongly resisted to high humidity, the filter paper could be applied for the filtration of acidic and alkaline solutions. What’s more, considering its high mechanical strength under the wet environment, it can be used for the operations that need to rinse the residue with spatula or water on the filter papers applied.

Hawach wet strengthened qualitative filter paper has different specifications for different samples with specific features. With its special characteristics, it is widely used in the laboratories for filtration of certain samples.