Table of ISO 4406 Particle Counts

NAS GRADE 1638

ISO Code

Number of Particles per 1ml > 5 Micron in Size

Number of Particles per 1ml > 15 Micron in Size

14

23/20
23/19
23/18
23/17

40,000 - 80,000
40,000 - 80,000
40,000 - 80,000
40,000 - 80,000

5,120 - 10,400
2,560 - 5,200
1,280 - 2,600
640 - 1,300

13

22/19
22/18
22/17
22/16

20,000 - 40,000
20,000 - 40,000
20,000 - 40,000
20,000 - 40,000

2,560 - 5,200
1,280 - 2,600
640 - 1,300
320 - 640

12

21/18
21/17
21/16
21/15

10,000 - 20,000
10,000 - 20,000
10,000 - 20,000
10,000 - 20,000

1,280 - 2,600
640 - 1,300
320 - 640
160 - 320

11

20/17
20/16
20/15
20/14

5,000 - 10,000
5,000 - 10,000
5,000 - 10,000
5,000 - 10,000

640 - 1,300
320 - 640
160 - 320
80 - 160

Normal Unfiltered Oil In Operation

10

19/16
19/15
19/14
19/13

2,500 - 5,000
2,500 - 5,000
2,500 - 5,000
2,500 - 5,000

320 - 640
160 - 320
80 - 160
40 - 80

9

18/15
18/14
18/13
18/12

1,300 - 2,500
1,300 - 2,500
1,300 - 2,500
1,300 - 2,500

160 - 320
80 - 160
40 - 80
20 - 40

 New OIL

8

17/14
17/13
17/12
17/11

640 - 1,300
640 - 1,300
640 - 1,300
640 - 1,300

80 - 160
40 - 80
20 - 40
10 - 20

7

16/13
16/12
16/11
16/10

320 - 640
320 - 640
320 - 640
320 - 640

40 - 80
20 - 40
10 - 20
5 - 10

6

15/12
15/11
15/10
15/9

160 - 320
160 - 320
160 - 320
160 - 320

20 - 40
10 - 20
5 - 10
2.5 - 5

5

14/11
14/10
14/9
14/8

80 - 160
80 - 160
80 - 160
80 - 160

10 - 20
5 - 10
2.5 - 5
1.3 - 2.5

Kleenoil Bypass Filter Range

4

13/10
13/9
13/8
13/7

40 - 80
40 - 80
40 - 80
40 - 80

5 - 10
2.5 - 5
1.3 - 2.5
0.6 - 1.3

3

12/9
12/8
12/7
12/6

20 - 40
20 - 40
20 - 40
20 - 40

2.5 - 5
1.3 - 2.5
0.6 - 1.3
0.3 - 0.6