GB/T 617-2006 is a general method standard for the determination of the melting point range of chemical reagents. It is suitable for all kinds of chemical reagents, and the melting point range is accurately determined through a standardized process. The standard specifies the equipment, such as the melting point tester, to clarify its accuracy and other requirements. Samples need to be prepared and filled according to the regulations. During operation, the heating rate is strictly controlled, and the physical state changes of the reagents are closely observed. The melting point range is determined according to the temperature at which the reagents begin to melt and completely melt. This standard provides a unified specification for the determination of the melting point range of chemical reagents, which helps to accurately evaluate the purity and mass of reagents and ensure the accuracy and Reliability of chemical experiments and related production activities.