"GB/T 19816.5-2005 Test method for metal abrasive for spray cleaning of steel surface preparation before coating Coatings, Part 5: Determination of the percentage of defective particles and microstructure" specifies the determination method for the percentage of defective particles and microstructure of metal abrasive for jet cleaning. The standard equivalent adopts ISO 11125-5:1993, which is suitable for evaluating the mass and conformity of metal abrasive. The proportion of defective particles and microstructural characteristics in abrasive are detected by equipment such as Metallurgical Microscopy to ensure that it can effectively remove impurities on the surface of steel without damaging the substrate during the spray cleaning process. The standard is proposed by the Chinese shipbuilding industry group company, the national Coating and pigment standardization technical committee, issued on September 14, 2005, and officially implemented on April 1, 2006.