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2The Grit-Number and Granule-size of Synthetic Diamond or CBN(Cubic Boron Nitride):
    (1).Original criterion of Industry Department(JB2808-79)

Grit-Number

Size()

Grit-Number

Size ()

36#

500400

W40

4028

46#

400315

W28

2820

60#

315250

W20

2014

70#

250200

W14

1410

80#

200160

W10

107

100#

160125

W7

75

120#

125100

W5

53.5

150#

10080

W3.5

3.52.5

180#

8063

W2.5

2.51.5

240#

6350

W1.5

1.50.5

280#

5040

W1.0

1.0 following

W0.5

0.5 following

    (2).Criterion of China(GB6405-86)

Grit-Number

Size()

Grit-Number

Size()

30/35

600500

0-0.5

00.5

35/40

500425

0-1

01

40/45

425355

0.5-1

0.51

45/50

355300

0.5-1.5

0.51.5

50/60

300250

0-2

02

60/70

250212

1.5-3

1.53

70/80

212180

2-4

24

80/100

180150

2.5-5

2.55

100/120

150125

3-6

36

120/140

125106

4-8

48

140/170

10690

5-10

510

170/200

9075

6-12

612

200/230

7563

8-12

812

230/270

6353

10-20

1020

270/325

5345

12-22

1222

325/400

4538

20-30

2030

Wider range

22-36

2236

30/40

600425

36-54

3654

40/50

425300

60/80

250180


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