The national standard has clear regulations on the content of solid polymeric iron sulfate, which is mainly divided into two categories: TPF and TPF-I type. Among them, the content of TPF type drugs should not be less than 20%, while the content of TPF-I type drugs should not be less than 18%. In addition, the national standard also provides detailed provisions for other indicators of the drug, such as color, insoluble substances, pH value, etc.

The preparation process of solid polymeric ferric sulfate is relatively complex, requiring multiple steps such as grinding, mixing, and drying to obtain the ideal product. Therefore, standardized management of drug content is crucial for improving product quality.