Form and Classification of diamonds
Classification of Diamond according to Bond Type
| Bond type | Diamond Type | Grit size range, μm |
| Resin | Diamond grain: АС4; АС5С; АС6 Micropowder: АСН |
200/160 to 50/40 60/40 to 5/3 |
| Metal | Diamond grain: АС6; АС15; АС20; АС32; АС50; АС65 Micropowder: АСН |
250/200 to 50/40 400/315 to 50/40 60/40 to 5/3 |
| Electroplated | Diamond grain: АС15-Н; АС20-Н; АС32-Н; АС50-Н; АС65-Н Micropowders: АСН-Н |
630/500 to 50/40 60/40 to 10/7 |
Conversion of Ukrainian Size Standards (DSTU 329295) to International Size Standards and their Applications by Operation
| Type of Operation | Ukrainian Standard DSTU 3292 µm |
ISO 565 International Standard, µm |
U.S. Standard ANSI В 74 |
FEPA International Standard |
| Rough Grinding |
400/315
|
425/355
|
40/45
|
D426
|
|
315/250
|
300/250
|
50/60
|
D301
|
|
|
250/200
|
250/212
|
60/70
|
D251
|
|
|
200/160
|
212/180
|
70/80
|
D213
|
|
|
160/125
|
180/150
|
80/100
|
D181
|
|
| Finish Grinding |
150/125
|
100/120
|
D151
|
|
|
125/100
|
125/106
|
120/140
|
D126
|
|
|
100/80
|
106/90
|
140/170
|
D107
|
|
| Fine Grinding |
80/63
|
90/75
|
170/200
|
D91
|
|
75/63
|
200/230
|
D76
|
||
|
63/50
|
63/53
|
230/270
|
D64
|
|
|
50/40
|
53/45
|
270/325
|
D54
|
|
|
45/38
|
325/400
|
D46
|
||
| Fine grinding,Polishing | 60/40 |
500
|
М63
|
|
| 40/28 |
550
|
М40
|
||
| 28/20 |
650
|
М25
|
||
| 20/14 |
1100
|
М16
|
||
| 14/10 |
1500
|
М16
|
||
| 10/7 |
1700
|
М10
|
||
| 7/5 |
3000
|
М6.3
|
||
| 5/3 |
4000
|
М4.0
|
Diamond paste
Diamond pastes are used for the finishing and polishing of ferrous and nonferrous metals, steels and semiconductors, alloyed steels, cast irons, ceramics, metal ceramics, carbide, sapphire, glass, semiconductors, and drawing dies.
Diamond pastes act on the workpiece surface chemically and mechanically. They form fine-dispersion emulsions that allow for a smoother distribution of diamonds over the workpiece surface. The paste also contains active surface agents, which make washing easier and help to remove slightly flammable liquids, chips and slag generated by the lapping process.
Pastes are produced with normal (N), higher (H) and extra-high concentration (E), depending on the volume content of diamonds and their grit size.
see also Conversion of Ukrainian Size Standards (DSTU 329295) to International Size Standards and their Applications by Operation
Volume content of diamond powder in diamond pastes.
|
Diamond size |
content of diamond in pastes (carat weight) in 1 kg. | ||
|
N |
H |
E |
|
|
60/40 |
400 |
1000 |
2000 |
|
40/28 |
400 |
1000 |
2000 |
|
28/20 |
300 |
750 |
1500 |
|
20/14 |
300 |
750 |
1500 |
|
14/10 |
300 |
750 |
1500 |
|
10/7 |
200 |
500 |
1000 |
|
7/5 |
200 |
500 |
1000 |
|
5/3 |
200 |
500 |
1000 |
|
3/2 |
100 |
250 |
500 |
|
2/1 |
100 |
250 |
500 |
|
1/0 |
100 |
250 |
500 |
|
0,5/0 |
100 |
250 |
500 |
Depending on grit size, pastes can be used for different finishes:
| Diamond powder grit sizes | Surface rough less Ra µm | Operation | |
| Before | After | ||
| D126-D54 | – | – | Rough finishing |
| M63-M40 | 0,4-0,2 | 0,195-0,155 | |
| M25-M16 | 0,16-0,1 | 0,12-0,075 | Semi- finishing |
| M10-M4 | 0,08 – 0,05 | 0,06 – 0,038 | Fine finishing |
| M2.5-M1 | 0,04 – 0,025 | 0,03 – 0,02 | Preliminary polishing |
| 1/0,5-0,1/0 | – | – | Polishing |