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ABRASIVE GRAINS OF WHITE CORUNDUM SIZING F22 – F220
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| White Corundum is produced by fusing of clean Al2O3 in electrical arc furnace. After crushed it and milled it on ball mills, arised corundum grains are several times magnetized and sieved according to the sizes. Chemical compound is made at grain F40.
| | guaranteed analysis | typical analysis |
| Al2O3 | 99,20 % min. | 99,50 % |
| Fe2O3 | 0,12 % max. | 0,07 % |
| SiO2 | 0,10 % max. | 0,056 % |
| CaO | 0,10 % max. | slight |
| Na2O | 0,28 % max. | 0,21 % |
| loss by ignition | 0,20 % max. | 0,15 % |
| | F22 – F90 | F100 – F150 | F180 – F220 |
| magnetic separation | 0,10 % max. | 0,20 % max. | 0,20 % max. |
| metal particulares | 0,001 % max. | 0,002 % max. | 0,008 % max. |
| granulation | g/dm3 min. | granulation | g/dm3 min. |
| F22 | 1710 | F70 | 1590 |
| F24 | 1710 | F80 | 1570 |
| F30 | 1700 | F90 | 1530 |
| F36 | 1680 | F100 | 1510 |
| F40 | 1680 | F120 | 1500 |
| F46 | 1660 | F150 | 1480 |
| F54 | 1660 | F180 | 1460 |
| F60 | 1640 | F220 | 1440 |
Granulation compound of grains 99 A I b F22 to F 220 has to meet requirements FEPA standard 42-D-1984. After agreement there is also a possibility to supply grainmixtures in framework of technological possibilities. Mehr auf:
KORUND Benátky s.r.o. |
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| WHAT TO GRIND? |
| Mohs | Material |
| 1 |
talc |
| 2 |
rock-salt |
| 3 |
calcite |
| 4 |
fluorite |
| 5 |
apatite |
| 6 |
feldspar |
| 7 |
flint |
| 8 |
topaz |
| 9 |
corundum |
| 9,5-10 |
silicon carbide |
| 10 |
diamond |
| HARDNESS (MOHS) |
| Material | Hardness |
| Tin |
1,8 |
| Graphite |
1,2 |
| Aluminium |
2,9 |
| Chromium |
9 |
| Cobalt |
5,5 |
| Silicon |
7 |
| Copper |
3 |
| Brass |
3,5-4 |
| Marble |
3-4 |
| Nickel |
3,8 |
| Steel |
5-8,5 |
| Lead |
1,5 |
| Wax 0°C |
0,2 |
| Zinc |
2,5 |
| Gold |
2,5 |
| Iron |
4,5 |
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