The Basics and Types of Filter Paper

Types of Filter Paper

Generally, the filter paper types are qualitative filter paper and quantitative filter paper. Qualitative filter paper is often used in qualitative analysis. The reason is that the qualitative filter paper produces more cotton fibers if it is filtered. The quantitative one is dealt with the particular process, which makes the paper not react with the common chemicals, in the production. As a result, it produces fewer impurities and is filter paper used in laboratory quantitative analysis. Hawach provides Wet Qualitative Laboratory Filtration Filter Paper Grade: BIO-2, Qualitative Filter Paper Biology Grade: BIO-6, Qualitative 20 Micron Filter Paper Grade: BIO-4, Quantitative Ashless Filter Paper Grade: BIO-41, Quantitative Cellulose Filter Paper Grade: BIO-44, Quantitative Laboratory Filter Paper Grade: BIO-42, and other filter papers for your choice.


What is Filter Paper?

The filter paper used in laboratory is one of the common lab consumables. It is normally round in shape and made from cotton fiber and used to filter components. In chemistry, we call the separation of solids and liquids filtration. In infiltration operation, filter paper is indispensable to filter out solids and liquids.

The functional principle of the filter paper is separating the substances through them. They are normally made from fiber, which is the reason that there are keyholes on them. The keyholes resist the big solid particles and provide pathways for the liquid particles. The different kinds of filter papers having different characters are made by different technics. So, what are the main factors in filter paper selection? There exist four: hardness, capacity, filtration efficiency, and applicability.

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Filter Paper Structure

The filter paper is directional. The front side of the filter paper has loose fibers; the mesh surface of the filter paper has tight fibers. The front pores are in the shape of a bell mouth, and the pores become smaller along with the thickness of the filter paper. The thickness of the filter paper is about 0.35~0.5mm, and the particle size of dust particles varies from ranging from a few microns to tens of microns.

Filter paper filtration not only has the function of a screen but also has the function of deep filtration; the side magnification shows that the filter paper is a multi-layer structure.

The front of the filter paper should face the direction of airflow, the screen surface should be in the direction of the gas flow. Color lines are drawn on the screen surface to facilitate user identification and prevent mistakes; if the front and back directions are wrong, the filter element is in use, and dust is stored. Ability is reduced by 30%.

Features of Filter Paper

Different filter paper types marketed by Hawach provide increasing degrees of purity, hardness, and chemical resistance. Filter paper used in laboratory filtration and is associated with high standards, good quality, reliability, and complete customer service. The unique features of our filter papers make them the best choice for customers.

Easy and efficient clarification of liquids containing low to medium levels of fine particulates, fast flow rates with high loading capacity is combined with the retention of very fine particles. The smooth surface is beneficial to offer high filtration speed and good retention for small particles. What’s more, the particle loading capacity of a filtration system can be greatly increased by using it.

Attractive Aspects of Filter Paper

In comparison with traditional filter paper, Hawach filter paper has some attractive aspects. Special parameters such as flow rate, pore size, filtration performance, and mechanical strength can be measured as required.

A fine capillary structure can absorb significantly larger quantities of water, and the uniform micro-pore structure of the membrane increases the velocity of flow. In addition, all filter paper is free of imperfections and contaminations which would affect their performance.

Hawach also prepared two other articles for you to introduce How to Fold Filter Paper, Filter Paper Grade Comparison between Hawach and Whatman and How to Use Filter Paper