Micron, micrometer (µm)

a unit of length. One micron = 39 millionths of an inch (.000039″). Contaminant size is usually described in microns. Relatively speaking, a grain of salt is about 60 microns and the eye can see particles to about 40 microns. Many hydraulic filters are required to be efficient in capturing a substantial percentage of contaminant particles as small as 5 microns.

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