240

45

57

57

Micro grits

Grit sizes finer than 220 are no longer classified in terms of mesh size; they are the result of a complex sedimentation process.

280

48

37

320

29

40

29

360

35

23

400

17

30

17

500

13

25

13

600

9

20

9

700

17

800

7

14

7

1000

5

12

4

1200

3

10

3

1500

2

8

2000

1

7

2500

5

3000

4

4000

3

6000

2

8000

1