GB/T 34905-2017 specifies the determination method of the cleanliness of powder metallurgy parts in sintered metal materials. The standard is applicable to all kinds of powder metallurgy parts and specifies the cleanliness determination process. First determine the appropriate pollutant collection method, such as washing, wiping, etc.; then analyze the collected contaminants, including particle count, component identification, etc.; finally determine the cleanliness grade according to the test results. Following this standard can accurately evaluate the cleanliness of powder metallurgy parts, which helps to improve product mass, reduce failures caused by pollution, ensure the stable operation of related equipment, and promote the standardized development of the powder metallurgy industry.