According to the query of official website of Zhengbao Medical Education Network, the standard of coarse powder in China Pharmacopoeia 22 refers to the powder that can pass through the No.2 sieve, but mixed with no more than 4% powder that can pass through the No.4 sieve.
The Pharmacopoeia of the People's Republic of China (22 Edition) is a pharmaceutical reference book published by China Medical Science and Technology Press in May 22. It is also an important part of national drug standards, and it is a legal technical standard that relevant units such as drug development, production (import), management, use, supervision and management should follow.