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.
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 |
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