SHM grit sizes and marks of superhard materials

Under controlled synthesis SHM with different physical and mechanical properties (strength, structure and shape of the crystals) are produced.
Synthetic diamond polishing powders of marks AC6-AC20, grit size 250/200-50/40.
Synthetic diamond micro-polishing powders of marks ACM and ACH, grit size 40/28-1/0.
Cubic boron nitride polishing powders of marks CBN30, CBN50, grit size 250/200-50/40.
Cubic boron nitride micro-polishing powders of mark CBN30, grit size 40/28-1/0.
* See grit sizes correspondence table

Grit sizes correspondence table for domestic and foreign SHM powder

Old Russian standard GOST 9206-80	New Russian standard GOST Р 53922	FEPA		US-standard (АСТМЕ-11)	ISO-standard (6106-2005)
micron	micron	Diamond	CBN	Mesh	micron
250/200	251	D251	В251	60/70, 70/80	251/212
200/160	213, 181	D181	В181	80/100	212/180,180/150
160/125	151	D151	В151	100/120	150/125
125/100	126	D126	В126	120/140	125/106
100/80	107, 91	D107, D91	В107, В91	140/170, 170/200	106/90, 90/75
80/63	76	D76	В76	200/230	75/63
63/50	64	D64	В64	230/270	63/53
50/40	54, 46	D54, D46	В54, В46	270/325, 325/400	53/45,45/38

Tool grit size is chosen according to the processing conditions and the workpieces quality requirement.