Subtlety Comparison Table of Synthetic Diamond with Foreign Standards

China

ISO

FEPA

America ANSI B74.16-1971

Japan JIS4130-1988

Germany DIN848-1988

Russia OCT9206-80

Grit

Size

Subtlety Ⅰ

Subtlety Ⅱ

Size

Grit

Size

Grit

Size

Grit

Size

Subtlety

Size

Grit

Size

40/45

425/355

426

—-

425/355

D426

425/355

40/50

425/300

40/50

425/300

D426

425/355

630/500

630/500

45/50

355/300

356

—-

355/300

D356

355/300

D356

355/300

500/400

500/400

50/60

300/250

301

50/60

300/250

D301

300/250

50/60

300/250

50/60

300/250

D301

300/250

400/315

400/315

60/70

250/212

251

—-

250/212

D251

250/212

60/80

250/180

60/80

250/180

D251

250/212

315/250

315/250

70/80

212/180

213

—-

212/180

D213

212/180

D213

212/180

250/200

250/200

80/100

180/150

181

80/100

180/150

D180

180/150

80/100

180/150

80/100

180/150

D181

180/150

200/160

200/160

100/120

150/125

151

100/120

150/125

D151

150/125

100/120

150/125

100/120

150/125

D151

150/125

160/125

160/125

120/140

125/106

136

120/140

125/106

D136

125/106

120/140

125/106

120/140

125/106

D136

125/106

125/100

125/100

140/170

106/90

107

140/170

106/90

D107

106/90

140/170

106/90

140/170

106/90

D107

106/90

100/80

100/80

170/200

90/75

91

170/200

90/75

D91

90/75

170/200

90/75

170/200

90/75

D91

90/75

80/63

80/63

200/230

75/63

76

200/230

75/63

D76

75/63

200/230

75/63

200/230

75/63

D76

75/63

63/50

63/50

230/270

63/53

64

230/270

63/53

D64

63/53

230/270

63/53

230/270

63/53

D64

63/53

50/40

50/40

270/325

53/45

54

270/325

53/45

D54

53/45

270/325

53/45

270/325

53/45

D54

53/45

—-

—-

325/400

45/38

46

325/400

45/38

D46

45/38

325/400

45/38

325/400

45/38

D46

45/38

—-

—-