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Absolute filter rating

Particles larger than the specified size rating of the filter media will not pass through that filter media (e.g. particles larger than 0.2 µm will not pass through a filter with an absolute rating of 0.2 µm). This rating refers to the size of particles retained by the filter at 100% efficiency.

FAQ
Particles larger than the specified size rating of the filter media will not pass through that filter media (e.g. particles larger than 0.2 µm will not pass through a filter with an absolute rating of 0.2 µm). This rating refers to the size of particles retained by the filter at 100% efficiency.
The absolute rating of a filter is the largest spherical glass particle diameter, which then passes, in labatory conditions through a filter. A nominal rating is a filter that is capable of blocking off a specific minimum percentage through a weight of solid particles that are of a specific contaminant.
Microns are units of measurement in a metric system that are equal to 1 millionth of a meter in length. Micron ratings are used to specify the capability of a liquid filter to get rid of contaminants by the size of the particles. For a micron rating to be effective, you need to know the filters’ removing effectiveness of the particle size.
It describes the ratio of the number of particles of a minimum given size upstream of a filter thus in comparison to the particle number of the same size or larger downstream of the filter.
Particles larger than the specified size rating of the filter media will not pass through that filter media (e.g. particles larger than 0.2 µm will not pass through a filter with an absolute rating of 0.2 µm). This rating refers to the size of particles retained by the filter at 100% efficiency.