China 'GB/T 25915.9-2018
' standard english version:
NATIONAL STANDARD OF THE PEOPLE'S REPUBLIC OF CHINA
GB/T 25915.9-2018
Cleanrooms and associated controlled environments—Part 9: Classification of surface cleanliness by particle concentration 洁净室及相关受控环境 第9部分:按粒子浓度划分表面洁净度等级
Issued Date:2018
Implemented Date:2018
Issued by:
The Standardization Administration of the People's Republic of China