Web Reference: The two most likely to be encountered in the oil & gas, and process industries are The ISO Cleanliness Code (ISO 4406), and The NAS 1638 cleanliness standard. An introduction to each of these allowable particle contamination standards is provided below. Jan 26, 2023 · Oil cleanliness is generally defined by two different particle count rating systems: the National Aerospace Standard (NAS) 1638 and the International Standards Organization (ISO) 4406. The figures are differential counts, and the NAS class is usually reported as a single figure representing the maximum allowed particle counts (i.e. worst case) for designated particle size ranges.
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