GB/T 21782.5-2010 "Powder coatings - Part 5: Determination of flow properties of a powder/air mixture" specifies the method for determining this flow property, aligning with the practical application scenarios of the powder coating industry. The test requires the use of a fluidization container made of transparent polymethyl methacrylate, a test container for powder collection, and an air conditioning unit equipped with a flowmeter. By controlling the flow rate of dry air, the flow characteristics of the powder/air mixture are evaluated, providing a technical basis for optimizing the spraying process and controlling the quality of the coating.