ISO-4406 Solid Contamination Code

International Standards Organization (ISO) specifies the code to be used in defining the quantity of solid particles in the fluid used in a given hydraulic fluid power system. Method for coding the level of contamination by solid particles. The purpose of this code is to simplify the reporting of particle count data by converting the numbers of particles into broad classes or codes, where an increase in one code is generally a doubling of the contamination level. The code for particle count comprises the following two-(2) part scales:

> 5 µm

> 15 µm

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