A micron rating for a fluid filter is a generalized way of indicating the ability of the filter to remove contaminants by the size of the particles. The micron rating does not properly or fully
describe either the efficiency or the contaminant-holding capacity of the filter.
What does the word micron mean? It is a unit of linear measure in the metric system used to
measure distance from one point to another. It is used like the inch, foot, centimeter and millimeter
to measure the length, width, or diameter of objects.
The micron rating for fluid filters is the relationship of particle sizes by diameter:
1 Micron = 1 Millionth of a Meter
1 Micron = 1 Thousandth of a Millimeter
Beach sand is 700 microns so a filter that is marked “10 microns” has some capability in capturing particles as small as 10 microns. However, there is no one accepted method to measure and describe the size of particles that a filter can capture or the total amount of particles that the filter can hold. When you see the filter marked “10 microns”, you will not know exactly what this means unless you also have a description of the test and standards used to determine the filter rating. Filter micron ratings are often based on one of these methods, but with many possible variations.
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