The Difference Between Filter Papers, Why Use Filter Paper?

What is filter paper?

Filter paper filtration is actually the function of chromatography. Paper chromatography is based on filter paper as support. Filter paper fiber and water have a strong affinity, can absorb about 22 percent of the water, and 6 to 7 percent of it is hydrogen-bonded to the hydroxide group of cellulose, which is difficult to remove under normal conditions.

And filter paper fiber and organic solvent affinity are very weak, so the general paper chromatography, in fact, with the combined water of filter paper fiber as the stationary phase, with organic solvent as mobile phase, when the flow down the paper after sample, the sample point between solute in water and organic phase in the continuous distribution, part of the sample with the mobile phase, into the area of the solute, at this time and redistribution, part of the solute from the mobile phase to stationary phase (water). With the continuous movement of the mobile phase, the different parts are continuously distributed according to their respective distribution coefficients and move along the mobile phase, so that the substances are separated and purified.

Difference between filter paper and normal paper

Different from ordinary filter paper, most paper is made of cotton fibers and is made in different ways for different purposes. Because it is made of fiber, the surface has numerous holes through which liquid particles can pass, while larger solid particles cannot, so the filter paper has the function of a filter. This property allows the mixing of liquid and solid substances to separate. The common shapes are filter paper disc and filter paper roll, mostly made of cotton fiber. Ordinary filter paper can only absorb 23% of the water, can not achieve the filtering effect. Paper, on the other hand, is a thin sheet made of plant fibers.
Filter Paper Suppliers Filter paper equivalent to Whatman

Filter paper is an effective filter medium, filter paper has been widely used in various fields. According to the composition of different types of filter paper fiber, filter paper performance, use is not the same, there are ordinary occasions for the ordinary filter paper, for high-temperature glass fiber filter paper, there is ultra-clean polypropylene filter paper. Paint filter paper is also known as v-type dry filter paper, organ type spray cabinet filter, paint mist filter paper (folding filter board). It is used in the dry spray room of new environmental protection products, it uses environmental protection filter paper; It makes spray oil/paint no more water, no more pollution! Can effectively filter paint, oil, glass raw materials, epoxy resin, asphalt, iron dragon, liquefied work-piece, plastic, porcelain, dye, coating class.

Why use filter paper?

Filter paper for laboratory use is a common tool with researchers. Filter paper can be divided into qualitative and quantitative two kinds. In the application of analytical chemistry. After the inorganic compound precipitate is separated by filtration, the residue is collected on the filter paper, and the loss rate in the experiment can be calculated. Qualitative filter papers after filtration more cotton fiber generation, so only suitable for qualitative analysis; The quantitative filter papers, especially the non-ash filter paper, can resist the chemical reaction more effectively after special processing procedures, so the impurities generated are less, which can be used for quantitative analysis.

In addition to the chemical experiment use, there is also frequent use of filter paper in daily life and engineering. Coffee filter paper is one of the widely used in daily life, and the filter paper on the outer layer of the teabag provides high softness and high wet strength. Other common filter papers are air filter paper for testing suspended particles in the air, and fiber filter paper for industrial applications.

How to select filter paper correctly?

When selecting filter paper, the main considerations should be:
1. The effective area is large, that is, the filter paper use area is large, can accommodate the dust volume is large, its resistance is small, its service life is long, relative to the cost is also increased accordingly.
2. The smaller the fiber diameter, the better the interception effect of the experimental components, so the filtration efficiency is correspondingly higher.
3. The higher the binder content in the filter material, the higher the tensile strength of the filter paper, the higher the efficiency during filtration, and the less the shedding. If the filter material background dust is small, its resistance is good, but the resistance will increase accordingly.

Click here to know Precautions When Using Qualitative and Quantitative Filter Paper