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2、The Grit-Number and Granule-size of Synthetic Diamond or CBN(Cubic Boron Nitride):

(1).Original criterion of Industry Department(JB2808-79)

Grit-Number

Size(μ)

Grit-Number

Size (μ)

36#

500~400

W40

40~28

46#

400~315

W28

28~20

60#

315~250

W20

20~14

70#

250~200

W14

14~10

80#

200~160

W10

10~7

100#

160~125

W7

7~5

120#

125~100

W5

5~3.5

150#

100~80

W3.5

3.5~2.5

180#

80~63

W2.5

2.5~1.5

240#

63~50

W1.5

1.5~0.5

280#

50~40

W1.0

1.0 following

W0.5

0.5 following

(2).Criterion of China(GB6405-86)

Grit-Number

Size(μ)

Grit-Number

Size(μ)

30/35

600~500

0-0.5

0~0.5

35/40

500~425

0-1

0~1

40/45

425~355

0.5-1

0.5~1

45/50

355~300

0.5-1.5

0.5~1.5

50/60

300~250

0-2

0~2

60/70

250~212

1.5-3

1.5~3

70/80

212~180

2-4

2~4

80/100

180~150

2.5-5

2.5~5

100/120

150~125

3-6

3~6

120/140

125~106

4-8

4~8

140/170

106~90

5-10

5~10

170/200

90~75

6-12

6~12

200/230

75~63

8-12

8~12

230/270

63~53

10-20

10~20

270/325

53~45

12-22

12~22

325/400

45~38

20-30

20~30

Wider range

22-36

22~36

30/40

600~425

36-54

36~54

40/50

425~300

60/80

250~180


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