How to Choose the Hawach Right Filter Papers?

Choosing the right filter for your filtration will be a big help to make sure that you can get the desired results for your applications. You can select a suitable filter material and size after you consider whether you need a vacuum or gravity filtration. Since there are so many types and sizes of filter papers available, you should know how to choose the right one.

When you choose the filter material, you need to consider chemical compatibility, pore size, and your filtration method upon the different filter types suitable for different methods. In addition to the material and method, you should consider the amount of your filtration and select the filter of the right size.

Hawach provides qualitative and quantitative filter papers. The qualitative filter paper is perfect to identify the properties of substances in qualitative analysis. And the quantitative filter paper is for filtration after the filtration. Hawach’s full lines of different filter paper products can always meet your needs for different levels of purity, hardness, flow rate, loading capacity, and chemical resistance. In general, filter paper can be divided into two types, one is qualitative, and one is quantitative. Qualitative filter paper generally refers to the generation of cotton fiber on its surface after filtration, which is generally only suitable for qualitative analysis.

While the quantitative filter paper is generally for the non-ash filter paper, in the process of use must go through a special processing program, to a certain extent, it can effectively resist some chemical reactions, so the generated impurities on its surface will be much less, it is generally used in quantitative analysis.

In addition to the application of filter paper in chemical experiments, there are also applications of filter paper in our daily life. For example, coffee filter paper is one of the most widely used. In general, this filter paper has high softness, while in industry, the filter paper is generally used to absorb suspended particles in the air.

Knowledge of Technical Index

The technical index of the filter paper can be divided into two aspects, one is the filter characteristic of the filter paper and the other is the physical property. The filter characteristics include air permeability, gas resistance, maximum pore size, and average pore size. Physical properties include quantitative, thickness, stiffness, corrugation depth, durability, resin content, etc.

Classification Factor

The filter paper can be divided into two types, one is qualitative, and one is quantitative. Qualitative filter paper generally refers to the formation of cotton fibers on its surface after filtration, which is generally only suitable for qualitative analysis. While quantitative filter paper is generally used for filter paper with an ash-free stage, a special treatment program must be adopted in the process of use so that it can effectively resist certain chemical reactions, and reduce the impurities generated on the surface of the filter paper. Qualitative Filter Paper Disc Grade: BIO-1Qualitative 20 Micron Filter Paper Grade: BIO-4, Qualitative Chromatography Filter Paper Grade: BIO-5. Quantitative Medium Flow Filter Paper Grade: BIO-40, Quantitative Ashless Filter Paper Grade: BIO-41Quantitative Cellulose Filter Paper Grade: BIO-44, Wet Strengthened 10 Micron Filter Paper Grade: BIO-91, Wet Strengthened Chemistry Filter Paper Grade: BIO-113.

The Function of Filter Paper

Most of the filter paper is made of cotton fiber and processed with different methods according to different purposes. As one kind of fiber product, there is countless micropore on the surface of filter paper to let liquid particle go through. On the other hand, the solid particle with larger sizes cannot go through the filter paper. With this feature, filter paper can be used to separate solid matter from liquid matter.

Qualitative Filter Papers
Quantitative Filter Papers

To be specific, the function of filter paper is to filter paper chromatography. As inert support, the filter paper fiber has a strong affinity with water and it can absorb 22% of the water. On the contrary, the filter paper fiber has a weak affinity with organic solvent.

In general, filter paper chromatography uses bound water in the fiber as the immobile phase and the organic solvent as the mobile phase. When the mobile phase flows through the sample on filter paper, the solute on the sample is distributed continually between water and organic solvent. Part of the sample moves with the mobile phase and flows into the non-solute area and some other solute will flow into the immobile phase with the mobile phase. With the continuous movement of the mobile phase, separation and purification of matters can be achieved through filter paper.

Basic properties of filter paper

The selection of suitable filter paper must be determined by the following four factors. First, the hardness. Filter paper will be wetted during filtration. The second is its filtration efficiency, which is mainly determined by the tightness of the seepage holes on the filter paper and the size of the holes. Then there is the capacity, which is mainly determined by the density of the holes through which water seeps. The denser the holes, the higher the capacity. Finally, applicability, some filter paper production steps are very special, so the application must pay attention to it.

Filter paper selection factor

In the selection of filter paper should consider the following points:
1. Effective area is large, that is, filter paper use area is large, dust capacity is large, resistance is small, and service life is long, of course, the cost is also increased accordingly.

2. The thinner the fiber diameter, the better the interception effect and the higher the filtration efficiency.
3. The binder content in the filter material binder content is high, the paper’s tensile strength is high, the filtration efficiency is high, the shedding phenomenon is less, and the filter material background dust is small, with good resistance, but the corresponding increase in resistance.

Quality Guarantee

All HAWACH filter papers are produced with high-purity α-cellulose and cotton fiber, with low ash content, is low background value, and low impurity dissolution rate; HAWACH adopts ISO9001 management system and has strict quality control links, which ensures high consistency of filter paper between batches and different batches. What’s more, its quality is proved by certification of safety test reports on heavy metal ions, etc. with CE certification and GTS third parties.

Other advantages

1. A wide range of product, including qualitative and quantitative filter papers; also, qualitative filter paper includes standard grade and wet strength grade; quantitative include ashless grade, hardened low ash grade, etc., which is convenient for customers with different needs;
2. Different product diameters:55, 70, 90, 110, 125, 150, 180, 185, 240, 270, and 300mm, easy to choose for different customers;
3. Wet strength grade qualitative filter paper shows superior compressive performance under high pressure and vacuum test conditions and not easy to break.

In addition to filter paper, HAWACH is able to provide you with one-stop shopping for lab consumables. Welcome to contact us.