Page 3 - DFF-series

CONTAMINANTS AND PURITY CLASSES

The normative document establishing the procedure for the classification of the main types of contaminants in
compressed air systems is ISO 8573-1:2010 Compressed air -Part 1: Contaminants and purity classes.
This standard specifies purity classes of compressed air practice, manufacturers of compressors and compressed
in respect of particles, water and oil regardless of the air treatment equipment, combine the three tables into
source of the compressed air. one for ease of use, as shown below:
The standard specifies purity classes for each type of
contamination in the form of three separate tables. In

Combined table Compressed air purity classes Water Oil
Solid Particulate
ISO8573-1:2010 CLASS of particulates per Concentration Dewpoint Liquid Total Oil (aerosol
Mass
Vapour
Maximum number
liquid and
Pressure
g/m³
vapour)
mg/m³
m³
0,1 - 0,5
1 - 5
0,5 - 1
micron micron micron mg/m³
0 As specified by the equipment user or supplier and more stringent than Class 1
1 ≤20.000 ≤400 ≤10 - ≤-70 °C - 0,01
2 ≤400.000 ≤6.000 ≤100 - ≤-40 °C - 0,1
3 - ≤90.000 ≤1.000 - ≤-20 °C - 1
4 - - ≤10.000 - ≤+3 °C - 5
5 - - ≤100.000 - ≤+7 °C - -
6 - - - ≤ 5 ≤+10 °C - -
7 - - - 5−10 - ≤ 0,5 -
8 - - - - - 0,5−5 -
9 - - - - - 5−10 -
Х - - - ›10 - ›10 ›10

Determination of the purity class of compressed air
according to ISO 8573-1:2010

The combined table «Compressed air purity classes» is Essentially, the purity classes characterize the quality
grouped according to three main types of contamination: of the compressed air. When using ISO 8573-1:2010 to
Solid particulates, Water and Oil. The different levels determine the required purity class for compressed air,
of contamination, contained in one cubic meter of the following designation is used:
compressed air, are assigned purity classes. ISO 8573-1:2010 Class A: B: C

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