The selection of suitable filter paper can be determined by considering the following four factors.
Hardness: the filter paper will get wet when it is filtered. For some long-term filtration test steps, it is necessary to consider the use of tough filter paper after wet water.
Filtration efficiency: the density and size of the water seepage holes on the filter paper affect its filtration efficiency. High efficiency filter paper has high filtering speed and resolution.
Capacity: the solid particles accumulated during filtration may block the small holes on the filter paper. Therefore, the denser the small water seepage holes are, the higher the capacity is, the more filter materials are allowed to be filtered.
Applicability: some filter papers are made with special manufacturing steps, for example, nitrogen free filter paper must be used for the determination of nitrogen content in blood in testing medicine.
Pay attention that the filter paper cannot filter zinc chloride, otherwise the filter paper will be corroded and damaged by zinc chloride
