"DB13/T 1234-2010 Method for determination of fineness of chemical products, sieving method" is a local standard in Hebei Province, which stipulates the method for determination of fineness of powdered chemical products by manual sieving method. The standard is applicable to the quality control of powdered chemical products, and the fineness is expressed by calculating the mass percentage of residue on sieve or under sieve. Its content includes method summary, equipment requirements, operation steps and result calculation. The standard provides a scientific basis for the production, testing and mass evaluation of chemical products to ensure that the product performance meets the requirements.