Product introduction of Black carborundum 24# for SiC segment
Black carborundum 24# for SiC segment is manufactured from high grade petrolem coke and silica sand. The smleting process is occured at high temperature above 2300 degree. The silicon carbide grain is get from airflow milling and reshape process. The particle size is controlled strictly under FEPA size standard. The high bulk density assure carborundum grain suitable for making abrasive segment. That means more grains packed in the mold of abrasive tools. Thus it can improve quality and performance of silicon carbide tools like segments working on marble and ceramic flooring.
Typical physical properties of Black carborundum 24# for SiC segment
| Hardness: | Mohs:9.2 |
| Melting Point: | dissociated at about 2300 °C |
| Maximum service temperature: | 1900℃ |
| Specific Gravity: | 3.2-3.45 g/cm3 |
| Bulk density(LPD): | 1.2-1.6 g/cm3 |
| Color: | Black |
| Particle shape: | Hexagonal |
| Modulus of Elasticity | 58-65×106 psi |
| Coefficient of Thermal Expansion | 3.9-4.5 x10-6/ ℃ |
| Thermal Conductivity | 60-200 W/MK |
Typical physical properties of Black carborundum 24# for SiC segment
| Content | Guarantee value | Typical value |
| SiC | ≥98% | 98.62% |
| Fe2O3 | ≤0.2% | 0.18% |
| F.C | ≤0.2% | 0.12% |
| Magnetic content | ≤0.02% | 0.011% |
Product Feature of Black silicon carbide Grit
- High purity, the purity of black silicon carbide after pickling can reach 99%. The production process of black silicon carbide powder is hydraulic classification, with less impurities and high purity.
- Superior oxidation resistance and chemical stability: when heated to 1000 ℃ in the air, silicon carbide only oxidizes on the surface, forming a layer of silicon dioxide film, which can protect silicon carbide material from oxidation. When heated to above 1627 ℃, the oxidation resistance of silicon carbide will decline rapidly.
- High hardness: Mohs hardness of black silicon carbide is 9.2-9.3, slightly lower than that of green silicon carbide.
- The toughness of black silicon carbide is higher than that of green silicon carbide.
- The packing density is high, and the black silicon carbide particles produced by the shaping process are more rounded.
- It has high cleanliness and is washed twice after crushing, reducing the dust in the abrasive.
Application of Black carborundum:
- Silicon carbide fiber disc.
- Whetstone, abrasive brick, abrasive rob,abrasive segment.
- Resin bonded silicon carbide abrasive grinding wheels.
- Vitrified bonded silicon carbide abrasive mounted-point, cup wheel, bowl wheel,etc.
- Sanding wheel and sanding sheet for ceramic tiles and granite,etc.
- Silicon carbide abrasive brushes.
- Other bonded abrasive tools.
Other available Grit Sizes:
| Macro Grit Size | Average particle size（mm） | Basic particle size（mm） |
| 8# | 2.460 | 2.000-2.360 |
| 10# | 2.085 | 1.700-2.000 |
| 12# | 1.765 | 1.400-1.700 |
| 14# | 1.470 | 1.180-1.400 |
| 16# | 1.230 | 1.100-1.180 |
| 20# | 1.040 | 0.850-1.000 |
| 22# | 0.885 | 0.710-0.850 |
| 24# | 0.745 | 0.600-0.710 |
| 30# | 0.625 | 0.500-0.600 |
| 36# | 0.525 | 0.425-0.500 |
| 40# | 0.438 | 0.355-0.425 |
| 46# | 0.370 | 0.300-0.355 |
| 54# | 0.310 | 0.250-0.300 |
| 60# | 0.260 | 0.212-0.250 |
| 70# | 0.218 | 0.180-0.212 |
| 80# | 0.185 | 0.150-0.180 |
| 90# | 0.154 | 0.125-0.150 |
| 100# | 0.129 | 0.106-0.125 |
| 120# | 0.109 | 0.090-0.106 |
| 150# | 0.082 | 0.063-0.075 |
| 180# | 0.069 | 0.053-0.075 |
| 220# | 0.058 | 0.045-0.063 |
| Grit designation | Mean grain size ds50-value in μm |
| F 230 | 53.0 ± 3 |
| F 240 | 44.5 ± 2 |
| F 280 | 36.5 ± 1.5 |
| F 320 | 29.2 ± 1.5 |
| F 360 | 22.8 ± 1.5 |
| F 400 | 17.3 ± 1 |
| F 500 | 12.8 ± 1 |
| F 600 | 9.3 ± 1 |
| F 800 | 6.5 ± 1 |
| F 1000 | 4.5 ± 0.8 |
| F 1200 | 3.0 ± 0.5 |
| F 1500 | 2.0 ± 0.4 |
| F 2000 | 1.2 ± 0.3 |
| F 3000 | 0.8±0.2 |
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