Brief Introduction of Filter Paper

Filter paper is a kind of special paper with excellent water-absorbing quality and filtration performance. The filter paper commonly used in the analytical laboratory is taken as a filter medium to separate the solution from the solid. Most filter paper is made of cotton fibers. But, generally speaking, filter paper for different purposes will be made in different ways. Because its material is made of fibers, it has many holes in the surface through which liquid particles can pass, whereas larger solid particles cannot. This property allows the separation of liquid and solid mixtures.

Hawach Filter paper is a kind of semi-permeable shield that is vertical to the liquid or airflow. It is commonly used to separate the subtle object from the fluid and air or remove solids from liquid in the science laboratory.

There are many characteristics of the key indexes of filter paper, such as wet strength, porosity, particle retention, volume flow, compatibility, efficiency, and capacity.

There are two mechanisms of paper filtration which are volume and surface respectively. Particles would be absorbed in the main body of filter paper through volume filtration, while on the paper surface through surface filtration. The general filter paper is commonly considered as the qualitative filter paper which is widely used both inside and outside the laboratory.

Hawach Filter paper is often used in laboratories, and many people are familiar with it. Most filter papers are made of cotton fibers, but filter papers for different purposes are made in different ways. It is mainly used for separating liquid and solid substances mixed together. Here is a brief introduction to some of the basic concepts of filter paper.

filter paper for laboratory use hawach-filter-papers-bio-41 ashless filter paper garde 41

Knowledge of Filter Paper

Filter paper is a common filtration tool in the chemical laboratory. Filter paper provided by our company is characterized by excellent quality, high purity, and good performance. The quality is guaranteed because all filter paper has passed the ISO9001 & CE certificate and is produced under tightly controlled manufacturing conditions, the purity is ensured because all filter paper is made from pure cotton linter and the ash content is less than 0.006%, the performance is good because retention and flow rate is moderate.

Types of Filter Paper

Now, domestic filter papers can generally be divided into three types–qualitative analysis, quantitative analysis, and chromatographic qualitative analysis. The two concepts of quantitative filter paper and qualitative are all available in cellulose filter paper and are not suitable for other types of filter paper such as glass microfiber filter paper.

Hawach Filter paper can be divided into qualitative filter paper and quantitative filter paper. In the application of analytical chemistry, when inorganic compounds are filtered and separated from sediments, the residues collected on filter paper can be used to calculate the loss rate in the experimental process. Qualitative and quantitative are completely compatible with the prior art and overcome more complicated structures in the existing technology. The former is subdivided into two kinds, that is, standard qualitative filter papers and wet-strengthened qualitative filter papers.

Qualitative filter paper is frequently adopted in qualitative chemical analysis and corresponding filtration separation. It is generally used to filter the solution in a qualitative test that does not require the calculation of chloride, sulfate, etc. Qualitative filter paper has more cotton fibers after filtration, so it is only suitable for qualitative analysis.

Quantitative filter paper is used for the precision calculation of numerical values, such as the determination of residue, insoluble matter, etc. After the general quantitative filter paper is filtered, it needs to enter the high-temperature furnace for processing.

The main difference between quantitative filter paper and qualitative filter paper is its impurity content. Hawach qualitative filter papers are commonly used for qualitative chemical analysis and corresponding filtration separations. The quantitative filter paper is used for gravimetric analysis and corresponding analysis tests in quantitative chemical analysis.

Ashless grade hardened low ash grade, hardened ashless grade

The essential difference lies in the content and hardness of impurities. Hardening low ash grade and hardening ashless grade are based on quantitative filter paper surface pickling to increase the surface bursting resistance of filter paper. Quantitative analysis of the retained substances is needed after filtration with the sample. The ash content of the ash-free grade is lower than that of the low ash grade.

The level of qualitative filter paper that is more suitable for normal use compared to quantitative filter paper is based on all sorts of properties including particle retention, thickness, and weight.

Chromatographic qualitative analysis filter paper is mainly used as a support in paper chromatography analysis with fast, medium, and slow speeds. Quantitative filter paper, especially ashless filter paper, can resist chemical reactions more effectively through special processing procedures, so the impurities generated are less and can be used for quantitative analysis.

Besides, when in practical use, the qualitative filter paper is suitable for qualitative analysis, and the quantitative filter paper is used for quantitative analysis. The difference between quantitative filter paper and qualitative filter paper is mainly due to the amount of ash produced after ash.

In addition to the filter paper used in general laboratories, there are many applications of filter paper in daily life and engineering.

Hawach provides Qualitative Filter Paper Disc Grade: BIO-1, Qualitative Laboratory Filtration Filter Paper Grade: BIO-2, Qualitative 20 Micron Filter Paper Grade: BIO-4, Qualitative Filter Paper Biology Grade: BIO-6, Quantitative Ashless Filter Paper Grade: BIO-41, Quantitative Roll Filter Paper Grade: BIO-43, Quantitative Cellulose Filter Paper Grade: BIO-44, Wet Strengthened 10 Micron Filter Paper Grade: BIO-91, and other filter papers for your choice.