"SS 397 PART 6-1997 Test Methods for cement, Part 6: Determination of fineness" is a Singapore standard that specifies a method for determining the fineness of cement. The standard uses a sieve method to sieve cement samples through 45 μm and 80 μm square well standard sieves. The mass percentage of residue on sieve indicates the fineness of cement. It is applicable to a variety of cement types such as silicate cement and ordinary silicate cement. The method also involves the cleaning and calibration of test sieves to ensure the accuracy of measurement results. The standard provides a scientific basis for cement production, quality control and performance evaluation, and is widely used in the field of building materials.