![]() Using the table below, the ISO code number to the left is used to represent the number of particles per ml. ISO 4406 measures the number of particles larger than 4µm, 6µm, and 14µm within the 100ml fluid sample. To make contamination levels easier to digest, a 100ml fluid sample is taken to analyze. ![]() Since contaminants come in a variety of shapes and sizes, the ISO cleanliness standard specifies measuring the size of particles in microns. The numbers in the ISO 4406 cleanliness code are used as the industry standard to measure contamination in various liquids, such as fuels and hydraulics. Since its inception, the charter has established a minimum cleanliness level for each of the diesel fuels under various available categories around the world. Fuel cleanliness levels using the ISO 4406 method was officially documented as a global standard only as recently as 1998 with the development of the Worldwide Fuels Charter (WWFC).
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