This standard specifies the quality grades of industrial compressed air for general use. This standard applies to general industrial compressed air. This standard does not apply to compressed air for direct breathing and medical use.
GB/T 13277-1991 history
2008GB/T 13277.1-2008 Compressed air.Part 1:Contaminants and purity classes
1991GB/T 13277-1991 Compressed air for general use--Quality classes