Filter paper is the abbreviation of filter paper, which is a special filter paper media material. If you subdivide it in detail, it includes chemical analysis filter paper, three-clean (removing air, fuel oil, lubricating oil) filter paper, edible oil filter paper, beer filter paper, high temperature filter paper, viscous liquid filter paper, gasoline filter paper and so many varieties.
The filter paper is made of fibers (plant fibers and other kinds of fibers) interwoven, which are mutually staggered to form many small holes, so they have good gas or liquid permeability. The thickness of the paper can be large or small, the shape is easy to process, and it is convenient to fold and cut. At the same time, in terms of production costs, transportation, and storage, the expenditure is relatively small.
Filter paper can be used for separation, purification, concentration, decolorization, deodorization, and recycling. This is of great significance for environmental protection, human health, equipment maintenance, and resource saving. The raw materials used in the filter paper are all plant fibers (chemical wood pulp, cotton pulp, mulberry pulp, etc.), such as chemical analysis filter paper; some are glass fiber, synthetic fiber, and aluminum silicate fiber. Even including metal fibers.
In addition to the above mixed fibers, some fillers should be added according to the formula, such as titanium dioxide, perlite, activated carbon, diatomaceous earth, ion exchange resin, etc. After a series of process treatments, the paper drawn from the paper machine must be processed again as needed: it can be sprayed, or impregnated, and can also be lined with other materials (such as non-woven fabrics, chemical fiber cloth, etc.). In order to improve or improve other properties of the filter material.
The most commonly used chemical analysis filter paper in chemical experiment classes in schools or in factories is divided into two types: one is called qualitative filter paper disc and the other is called quantitative medium flow filter paper. Quantitative medium flow filter paper is similar in appearance to qualitative filter paper, except that its basis weight is 85g/m2, but its internal quality is much higher than the qualitative filter paper disc. The most important thing is that after burning, the ash content left in the paper must not exceed one ten thousandth (0.01%), so that the weight of the filter can be accurately obtained during analysis and measurement, without causing errors.
Because of this, in the process of making quantitative filter paper, other technological measures (such as mixed acid treatment, ion exchange, etc.) need to be used to ensure the quality of the finished paper. Similarly, the quantitative filter paper is also divided into fast, medium, and slow speed.
About chemical analysis filter paper: 1. Chemical analysis filter paper, divided into qualitative filter paper disc and quantitative medium flow filter paper; they appear white; 2. Chemical analysis filter paper is divided into different specifications according to the size of the diameter; 3. The filter paper used as a general filtering operation guide is a “large sheet” specification and can be cut into small pieces for the experiment.