At present, the quantitative analysis filter paper produced in China can be divided into three categories: fast, medium speed and slow speed. The white band (fast), the blue band (medium speed) and red band (slow speed) are used as markers to classify the filter paper box. The shape of the filter paper has two kinds: round and square. According to the diameter, the specifications of circular 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.
In addition, the difference between quantitative filter paper and qualitative filter paper is that qualitative filter paper is used for qualitative chemical analysis and corresponding filtration separation, and quantitative filter paper is used for gravimetric analysis test and corresponding analysis test in quantitative chemical analysis.
The quantitative filter paper is mainly used for ashing weighing analysis experiments after filtration. The ash weight of each filter paper after ashing is a fixed value. The qualitative filter paper is used for general filtration.
The main difference between quantitative filter paper and qualitative filter paper is the amount of ash produced after ashing. The main difference between quantitative filter paper and qualitative filter paper is the amount of ash produced after ashing. Qualitative filter paper does not exceed 0.13%, quantitative filter paper does not exceed 0.0009%. Ashless filter paper is a kind of quantitative filter paper, its ash content is less than 0.1 mg, this weight can be neglected in the analytical balance. Note that both quantitative filter paper and qualitative filter paper are concepts of cellulose filter paper.
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