The following section will discuss the differing Classifications or Rating of Filter Element Media. Typically a DOP (Dispersed Oil Particulate) Test is performed that challenges the Media with a Aerosol of varying Particulate Sizing which is measured by a Photometer for:
- Arrestance Efficiency: Simply this is the measure of how efficient the Filter Media is in removing Particulate or Fibre from the Aerosol Challenge- the higher the efficiency the Higher the rating Class / Rating.
- Volumetric Penetration: This is the reverse of Arrestance Efficiency which can be expressed as Volumetric Penetration- that is if a Filter media is 99.97% Efficient then the Volumetric Penetration (percentage that got through the media) would stated as 0.03%.
Typically (according to EN1822) a DOP Testing Unit is utilised that uses a Aerosol Generator and a Photometer that measures the results.