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Understanding ISO Codes
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The ISO Cleanliness Code (per ISO 4406-1999) is used to quantify particulate contamination levels per milliliter of fluid at 3 sizes – 4?[C], 6?[C], and 14?[C]. It is expressed in 3 numbers (example 19/17/14) where each number represents a contaminant level code for the correlating particle size. The code includes all particles of the specified size and larger.
It is important to note that each time a code increases, the quantity range of particles is doubling. Inversely, as a code decreases by one the contaminant level is cut in half.
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ISO Code Example:
13 / 10 / 6
4?[C] 6?[C] 14?[C]
Channel Channel Channel
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| ISO Code | Particles per Milliliter (PPM) | Sample Values Before Filtration | |||||
| Lower Limit | Upper Limit | Particle Size | PPM | ISO 4406 Code Range | ISO Code | ||
| 24 | 80000 | 160000 | 4µm | 151773 | 80000-160000 | 24 | |
| 23 | 40000 | 80000 | 4.6µm | 87210 | |||
| 22 | 20000 | 40000 | 6µm | 38363 | 20000-40000 | 22 | |
| 21 | 10000 | 20000 | 10µm | 8229 | |||
| 20 | 5000 | 10000 | 14µm | 3339 | 2500-5000 | 19 | |
| 19 | 2500 | 5000 | 21µm | 1048 | |||
| 18 | 1300 | 2500 | 38µm | 112 | |||
| 17 | 640 | 1300 | 68µm | 2 | |||
| 16 | 320 | 640 | |||||
| 15 | 160 | 320 | Sample Value After Filtration | ||||
| 14 | 80 | 160 | Particle Size | PPM | ISO 4406 Code Range | ISO Code | |
| 13 | 40 | 80 | 4µm | 69 | 40-80 | 13 | |
| 12 | 20 | 40 | 4.6µm | 35 | |||
| 11 | 10 | 20 | 6µm | 7 | 5-10 | 10 | |
| 10 | 5 | 10 | 10µm | 5 | |||
| 9 | 2.5 | 5 | 14µm | 0.4 | 0.32-0.64 | 6 | |
| 8 | 1.3 | 2.5 | 21µm | 0.1 | |||
| 7 | 0.64 | 1.3 | 38µm | 0.0 | |||
| 6 | 0.32 | 0.64 | 68µm | 0.0 | |||
Fluid Cleanliness Code Comparison
| ISO/DS 4406 BS 5540/4 Codes |
NAS 1638 | SAE 749 | Defence Standard 05/42 | |
| Table A | Table B | |||
| 25/23/17 | 100000 | |||
| 24/22/15 | 21000 | |||
| 23/21/18 | 12 | |||
| 23/21/14 | 15000 | |||
| 22/20/17 | 11 | |||
| 22/20/13 | 6300 | |||
| 21/19/16 | 10 | |||
| 21/19/13 | 4400 | 6300F | ||
| 20/18/15 | 9 | 6 | ||
| 20/18/13 | 4400F | |||
| 20/18/12 | 2000 | |||
| 19/17/14 | 8 | 5 | ||
| 19/17/11 | 1300 | 2000F | ||
| 18/16/13 | 7 | |||
| 18/16/11 | 1300F | |||
| 18/16/10 | 800 | |||
| 17/15/12 | 6 | 3 | ||
| 17/15/10 | 800F | |||
| 17/15/09 | 400 | |||
| 16/14/11 | 5 | 2 | ||
| 16/14/09 | 400F | |||
| 15/13/10 | 4 | 1 | ||
| 14/12/09 | 3 | 0 | x | |
| 13/11/08 | 2 | |||
