particle counts can be accurately converted to contamination levels. Prior to 1999, ISO Codes were expressed as only two numbers, such as 14 / 11, which represented the number of particles greater than 5 microns and greater than 15 microns. Note that the comparison to ISO 4406 is necessarily an approximation. ISO 4406:1999 codes (hydraulic fluid contamination). The contamination classes are defined by a number (from 00 to 12) which indicates the maximum number of particles per 100 mL, counted on a differential basis, in a given size bracket. Contamination level classes according to NAS 1638 (January 1964) This convention is employed with laser particle size analyzers. #ISO 4406 TO NAS 1638 CONVERSION HOW TO#The NAS 1638 coding system defines the maximum numbers permitted of 100mL volume at various size intervals (differential counts) rather than using cumulative counts as in ISO 4406.Īlthough there is no guidance given in the standard on how to quote the levels, most industrial users quote a single code which is the highest recorded in all sizes. It is still referred to in some industries, although the ISO 4406 cleanliness codes are more commonly found. The table below shows the classification values that may still be in use for older specifications based on Hiac particle. Converting Oil Cleanliness Standards - ISO to NAS to ISO. The classes refer to maximum number the particles in 100mL in different size classes. Hydraulic fluid cleanliness codes & standards ISO 4406 and NAS 1638 comparison and charts. The application of this standard was extended to industrial hydraulic systems as nothing else existed at the time. NAS 1638 is an older standard developed in 1964 to define classes of contamination in aircraft components and hydraulic fluids. Iso 4406 To Nas 1638 Conversion Islamic Will Template South Africa Tiesto Club Life Volume Two Miami Zip Spore Galactic Adventures 5. The NAS system was originally developed in 1964 to define contamination classes for contamination contained in aircraft components. A Comparison of NAS 1638 and ISO 4406 Cleanliness Codes
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