ISO 8573-1: … 9:

Attention is drawn to the possibility that some of the elements of this part of ISO 8573 may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights.
International Standard ISO 8573-5 was prepared by Technical Committee ISO/TC 118, Compressors, pneumatic tools and pneumatic machines, Subcommittee SC 4, Quality of compressed air.

ISO 8573 consists of the following parts, under the general title Compressed air:

Part 1: Contaminants and purity classes
Part 2: Test methods for aerosol oil content
Part 3: Test methods for measurement of humidity
Part 4: Test methods for solid particle content
Part 5: Test methods for oil vapour and organic solvent content
Part 6: Test methods for gaseous contaminant content
Part 7: Test methods for viable micro biological contaminant content
Part 8: Test methods for solid particle content by mass concentration
Part 9: Test methods for liquid water content

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