Borserini

Categories

Search product

Understanding ISO Codes

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.
      ISO Code Example:
13 / 10 / 6
      4?[C]                 6?[C]                14?[C]
     Channel            Channel          Channel

 

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

 

Understanding_ISO_Codes_Catalog_4.0.6_6-11

Download