China 'GB/T 20504-2006
' standard english version:
NATIONAL STANDARD OF THE PEOPLE'S REPUBLIC OF CHINA
GB/T 20504-2006
Anodizing of aluminium and its alloys - Visual determination of image clarity of anodic oxidation coatings - Chart scale method 铝及铝合金阳极氧化 阳极氧化膜影像清晰度的测定 条标法
Issued Date:2006-09-26
Implemented Date:2007-02-01
Issued by:
The Standardization Administration of the People's Republic of China