Filtration Efficiency and Applicability of Filter Paper

In general, there are two types of filter paper in the laboratory: qualitative filter paper and quantitative filter paper. In the application of analytical chemistry, when sediment is separated after the inorganic compound is filtered, the residue which is collected on the filter paper can be used to figure up the wastage rate during the process of the experiment.

After filtration, many cotton fibers will be created on qualitative filter paper ( such as Qualitative Chromatography Filter Paper Grade: BIO-5), so it is only suitable for qualitative analysis. As for quantitative filter paper ( such as Quantitative Medium Flow Filter Paper Grade: BIO-40), especially ashless filter paper which is specially processed, it can effectively resist chemical reactions so that fewer impurities will be produced. Thus, it can be applied in quantitative analysis.

Apart from filter paper which is applied generally in the laboratory, it is also widely used in daily life or engineering. It can be used for testing suspended particles in the air or applied in different industrial applications.

Filtration Efficiency and Applicability of filter paper

1. Particle Retention:

  • One of the critical factors influencing filtration efficiency is the particle retention capacity of the filter paper. The appropriate choice of filter paper with a specific pore size or particle retention rating ensures efficient separation of particles from the liquid phase.

2. Filtration Speed:

  • Filtration speed, or the rate at which liquid passes through the filter paper, varies among different grades. Balancing the need for speed with the requirement for efficient filtration is essential. Faster filtration may be prioritized in some applications, while others demand a slower, more thorough process.

3. Chemical Compatibility:

  • Filter paper must be chemically compatible with the substances being filtered. Different filter papers exhibit varying resistance to chemicals and solvents, ensuring that the chosen filter paper does not degrade or react with the filtrate.

4. Moisture Resistance:

  • Some filter papers are treated to resist moisture, making them suitable for filtration in humid conditions or when dealing with moisture-sensitive samples. This characteristic ensures consistent filtration performance under varying environmental conditions.

5. Temperature Stability:

  • The stability of filter paper under different temperature conditions is crucial, especially in applications involving hot or cold liquids. Filter papers designed to withstand specific temperature ranges contribute to reliable filtration outcomes.

6. Application-Specific Filter Papers:

  • Specialized filter papers cater to specific applications, such as air monitoring filter paper designed for collecting airborne particles. Benchkote™ bench protection paper is employed to safeguard laboratory surfaces during weighing and other procedures.

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Tips for selection filter paper

Several points should be considered in the selection of filter paper:
1. The use area of the filter paper is large, the dust content is large, the resistance is small, the service life is long, and the cost is correspondingly increased.
2. The smaller the fiber diameter is, the better the interception effect is and the higher the filtration efficiency is.
3. The binder content of the binder in the filter material is high, the tensile strength of the paper is high, the filtration efficiency is high, the dust of the filter material is small, and the resistance is good, but the resistance is correspondingly increased.

Hardness and Capacity of filter paper

The selection of appropriate filter paper can be determined by taking into account the following factors. For the hardness factors, filter paper often becomes wetting in the filtering process, so some experimental steps of long-term filtration should consider the use of tough filter paper after wetting.

For the capacity factor, the solid particles accumulated during filtration may block the pores on the filter paper, therefore, the denser the seepage pores are, the higher the capacity is and the more filters are allowed.