Filter papers are generally qualitative and quantitative. Most filter papers are composed of cotton fibers, and there are countless small holes on their surface for liquid particles to pass through, while larger solid particles cannot pass through. Here are some brief introductions of filter papers:
Brief introductions of filter papers:
The types of filter paper:
Filter paper can generally be into two types: qualitative and quantitative.
When after filtration, qualitative filter paper will produce some cotton fibers, so it is often for qualitative analysis;
And quantitative filter paper, especially ashless filter paper, has undergone special treatment procedures, which can effectively resist chemical reactions, so fewer impurities are generated and can be used for quantitative analysis.
And other air filter paper is for testing suspended particles in the air, and fiber filter paper is for different industrial applications.
Hawach filter paper is often qualitative and quantitative filter paper, like the No. 41 filter paper.
And Hawach No. 41 filter paper has good permeability to gas or liquid and is often for chemical qualitative analysis
How to use filter papers:
In experiments, filter paper is often for together with equipment such as filter funnels and Buchner funnels.
And when using the filter paper, should fold the paper into a suitable shape.
People often fold the filter papers in a flower-like shape
The folding degree of the filter paper is much higher, the surface area is higher, and the filtering effect is better, but remember not to over-fold the filter paper
Some tips about how to choose filter papers:
How to choose filter papers:
Avoid wet during filtration, should choose the use of tougher filter paper after wet water when doing some experimental procedures for long-term filtration
And want filtration efficiency is high, and the density and size of the seepage pore should choose suitably. Often high-efficiency filter paper provides fast filtration and high resolution.
When using paper, may block the pores on the filter paper in the solid particles, so we should choose the denser the water seepage pores and the higher the capacity.
And should make some filter papers by special production steps, for example, should use filter paper in testing medicine for measuring nitrogen content in blood, nitrogen-free.
Note that the filter paper cannot filter zinc chloride, otherwise, will corrode and damage the filter paper zinc chloride
The effective area is large:
And when people use it in a large area, the dust-holding capacity of filter paper is large, and the resistance is small
The finer the fiber diameter:
Filter paper has a better interception effect and correspondingly filtration efficiency of paper will high
The binder content in the filter paper material:
And the binder content in the filter paper material is high, the tensile strength of the filter paper is high, the filtration efficiency of the paper is high, and gradually the lint is less