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Appendix D
68 SAE AS4059 REV.E Cleanliness Classification For . . .
SAE AS4059 REV.E Cleanliness
Classification For Hydraulic Fluids
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This SAE Aerospace Standard (AS) defines cleanliness levels for particulate cont-
amination of hydraulic fluids and includes methods of reporting data relating to the
contamination levels. Tables 1 and 2 below provide the Maximum Contamination
Limits (Particles/100ml) of differential and cumulative particle counts respectively
for counts obtained by an automatic particle counter, e.g. ICM.
Size range μm(c): 6 - 14 14 - 21 21 - 38 38 - 70 >70
Class
00 125 22 4 1 0
0 250 44 8 2 0
1 500 89 16 3 1
2 1,000 178 32 6 1
3 2,000 356 63 11 2
4 4,000 712 126 22 4
5 8,000 1,425 253 45 8
6 16,000 2,850 506 90 16
7 32,000 5.700 1,012 180 32
8 64,000 11,400 2,025 360 64
9 128,000 22,800 4,050 720 128
10 256,000 45,600 8,100 1,440 256
11 512,000 91,200 16,200 2,880 512
12 1,024,000 182,400 32,400 5,760 1,024
Table D.1 AS4059E Table 1 - Cleanliness Classes for Differential Parti-
cle Counts
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The information reproduced on this and the previous page is a brief extract from SAE AS4059 Rev.E,
revised in May 2005. For further details and explanations refer to the full Standard.