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This air quality is most frequently encountered in the industry
ISO 8573-1:2010
General compressed air specification
The ISO 8573 -1:2012 specifies purity classes of compressed air for the presence of particles, water and oil, whatever the sampling point is located  in the compressed air distribution line for which the air quality is specified or measured.
The main pollutants are particles, water, and oil respectively describe in parts 4and 8, parts 3and 9 and parts 2 and 5. Part 5 is also related to organic solvants.
Part 6 refers to gaseous contaminants and part 7 to microbiological contaminants.
Additionnaly  the table describes below which refers to class definition, part 1 also provides glossary and term definition.
The designation of the purity class of compressed air at the specified measuring point shall include the information in the order given ;

ISO 8573-1:2010[ A:B:C]  where A is a figure from table 1, B form table 2 et C from table 3

 Table 1 solid particles classes (1)
class Maximum number of particles according to their size (dia µm)
0,1 0,5 1,0
0 as defined by user or supplier and more stringent than class 1
1   < or =400 < or =10
2 < or =400 000 < or =6000 < or =100
3 Not specified < or =90 000 < or =1000
4 Not specified Not specified < or =10 000
5 Not specified Not specified < or =100 000  
















other classes are determined by volumic mass

 Table 2 humidity classes
class Pressure Dew point expressed in °C
 
0 as defined by user or supplier and more stringent than class 1
1 < or = -70
2 < or = -40
3 < or= -20
4 < or = +3
5 < or = +7
6 < or = +10 


















Other classes are defined by mass of liquid water content par cubic meter.(1)

 Table 3  oil classes(1)
class conncentration total oil (liquid, aerosol, vapor) in mg/m3
 
0 as defined by user or supplier and more stringent than class 1
1 < or = 0,01
2 < or = 0,1
3 < or = 1
4 < or = 5
X > 5  
 















(1): All values refer to :
  • air temperature 20°C
  • absolute air pressure 100 kPa = [1bar] (a)


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