The paper of the filter paper is loose and has strong absorption of liquid. Analytical laboratories often use filter paper as a filter medium to separate the solution from the solids.
What’s more, quantitative analysis filter paper in the manufacturing process, the pulp treated by hydrochloric acid and hydrofluoric acid, and washed by distilled water, will remove most of the impurities in the paper fiber, so the residual ash after burning is very small, almost no impact on the analysis results, suitable for precise quantitative analysis.
At present, the quantitative analysis filter paper produced in China can be divided into three categories: fast, medium and slow. On the filter cartons, the white band (fast), the blue band (medium speed) and red band (slow speed) are used as the markers for classification.
The shape of the filter paper has two kinds: round and square. According to the diameter, the specifications of circular fixed paper can be divided into d9cm, d11cm, d12.5cm, d15cm and d18cm. Quadrate quantitative filter paper has 60 cm x 60 cm and 30 cm x 30 cm.
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