ISO 12500-3

ISO 12500-3
Filters for compressed air— Test methods—Part 3: Particulates
First edition (2009)
ISO 12500-3 specifies test and inlet (challenge) conditions for compressed air filters for particle separation. ISO 12500-3 determines the (fractional) efficiency and the according differential pressure of a compressed air filter at the standardized test and inlet conditions:

  • nominal volume flow at 7 bar and 20°C, alternatively at atmospheric conditions
  • inlet challenge agent
    • fine: NaCl (solid) or DEHS (liquid) particles according to EN 1822-1, EN 1822-2
    • coarse: test dust according to ISO 12103-1, A4
  • determination of the efficiency
    • fine: particle counter according to EN 1822-2 and EN 1822-5
    • coarse: suitable particle counter or microscopic analysis
  • three examples of each filter shall be tested


ISO 12500-3 allows to determine the efficiency of a compressed air filter either at pressure or at atmospheric conditions while efficiency depends on the working pressure. Thus for comparison it is important to pay attention if the test was carried out at 7 bar or 0 bar working pressure, respectively.