Cleanliness Classes as per ISO 4406:1999
Cleanliness levels are defined by three numbers separated by slashes (/). These numbers correspond to 4, 6 and 14 micron, in that order. Each number refers to an ISO Range Code, which is determined by the number of particles for that size (4,6, & 14 Microns) and larger present in 1ml of fluid. Each range is double the range below. Refer to the chart below to see the actual ranges.
The contamination class of 18/16/13 or lower is recommended for high quality / high pressure hydraulic equipment.
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ISO Codes