The GB/T 16913.5-1997 standard specifies a method for determining the angle of repose in dust physical property tests, using the injection-defined bottom surface method. This test is used to determine the flowability and accumulation characteristics of dust under static conditions, reflecting the possible behavior of dust during storage and handling. The standard provides specific operating procedures for Dust Physical PropertyAnalysis, which helps to evaluate dust handling and storage performance, thereby guiding dust management and equipment design in industrial applications.