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(¦Ì) | Grit-Number | Size (¦Ì) | 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(¦Ì) | Grit-Number | Size(¦Ì) | 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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