Annex
Cleanliness class - SAE AS 4059
Like ISO 4406, SAE AS 4059 describes particle concentrations in fluids. The
analysis methods can be applied in the same manner as ISO 4406:1999.
An additional feature in common with ISO 4406:1999 is that cleanliness
classes are grouped on the basis of cumulative number of particles (i.e. all
particles that are larger than a certain limit value are > 4 µm, for example).
As opposed to ISO, SAE AS 4059 uses different limit values among the
various particle sizes for contamination classes.
For this reason, the corresponding designation of the particle size being
examined in the SAE cleanliness classes always has to be added, e.g.:
AS 4059 Class 6B
-> 9731 – 19500 particles >6 µm
AS 4059 Class 8A/7B/6C
-> 3-value ISO code >4µm/>6µm/>14µm
If an SAE class is given acc. to AS 4059 without a letter, then it is always
particle size B (> 6 µm).
The following table shows the cleanliness classes in relation to the particle
concentration determined.
Table - SAE AS 4059
Maximum particle count / 100 ml
Size ISO 4402
> 1 µm
> 5 µm
> 15 µm
> 25 µm
> 50 µm
> 100 µm
Size ISO 11171
> 4 µm
(c)
> 6 µm
(c)
> 14 µm
(c)
> 21 µm
(c)
> 38 µm
(c)
> 70 µm
(c)
Size coding
A
B
C
D
E
F
C
lasses
000
195
76
14
3
1
0
00
390
152
27
5
1
0
0
780
304
54
10
2
0
1
1,560
609
109
20
4
1
2
3,120
1,220
217
39
7
1
3
6,250
2,430
432
76
13
2
4
12,500
4,860
864
152
26
4
5
25,000
9,730
1,730
306
53
8
6
50,000
19,500
3,460
612
106
16
7
100,000
38,900
6,920
1,220
212
32
8
200,000
77,900
13,900
2,450
424
64
9
400,000
156,000
27,700
4,900
848
128
10
800,000
311,000
55,400
9,800
1,700
256
11
1,600,000
623,000
111,000
19,600
3,390
512
12
3,200,000
1,250,000
222,000
39,200
6,780
1,020
ContaminationSensor CS1000
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