Iso 4406 To Nas 1638 Conversion
NAS 1638 Code. The NAS system was originally developed in 1964 to define contamination classes for the contamination contained within aircraft components.
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ISO 4406 The ISO Cleanliness Code, ISO 4406, 1987 is the perhaps the most widely used International standard for representing the contamination level of industrial fluid power systems. Under ISO 4406 cleanliness is classified by a two number code, e.g. 16/13, based on the number of particles greater than 5 µm and 15 µm respectively in a known volume of fluid. However some manufacturers have expanded the code to three numbers by the addition of a code number representing the number of particles greater than 2 µm, e.g. Using the table below, we can see a cleanliness rating of 18/16/13 would mean that there were 1300 - 2500 particles greater than 2 micron in size 320 - 640 particles greater than 5 micron in size, and 40 - 80 particles greater than 15 microns in size. The full table of ranges for ISO 4406 is shown below Range Number No of Particles per ml More Than Up to and including 24 80 000 160 000 23 40 000 80 000 22 20 000 40 000 21 10 000 20 000 20 5 000 10 000 19 2 500 5 000 18 1 300 2 500 17 640 1 300 16 320 640 15 160 320 14 80 160 13 40 80 12 20 40 11 10 20 10 5 10 9 2.5 5 8 1.3 2.5 7 0.64 1.3 6 0.32 0.64 NAS 1638 The NAS 1638 cleanliness standard was originally developed for aerospace components in the US but is still widely used for industrial and aerospace fluid power applications.
It is used widely in the UK North Sea industries. NAS 1638 is comprised of fluid cleanliness classes, each class defined in terms of maximum allowed particle counts for designated particle size ranges. Class Maximum Number of Particles / 100 ml 5 - 15 15 - 25 25 - 50 50 - 100 >100 00 125 22 4 1 0 0 250 44 8 2 0 1 500 89 16 3 1 2 1000 178 32 6 1 3 2000 356 63 11 2 4 4000 712 126 22 4 5 8000 1425 253 45 8 6 506 90 16 7 1012 180 32 8 0 2025 360 64 9 10 4050 720 100 1440 200 0 2880 500 10 5760 1024.