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The ISO 4406 classification system was initially developed for hydraulic oils as a way for quantifying the contamination of an oil sample. ISO cleanliness codes give a three-numbered "score" for the cleanliness of a lubricant - these scores are widely used across industry as a standard measurement. Understanding how to read and interpret ISO cleanliness codes are an essential skill for any mechanical engineer, fitter, or lubricant technician, and this video explains how to do it.
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