Black Silicon Carbide 60/90 Grit Rock Tumbling Polishing Media
Black Silicon Carbide 60/90 Grit – High-efficiency Coarse Grinding Tumbling Media for Raw Stone Shaping. It’s the first step for the rock & pebble stone polishing.
Black Silicon Carbide 60/90 grit serves as professional rock tumbling polishing media tailored for rough grinding and shaping all kinds of hard stones, jade, agate, crystal and mineral specimens. Featuring ultra-high hardness, sharp cutting edges and stable self-sharpening performance, this silicon carbide abrasive efficiently removes rough outer skin, deep scratches, bumps and irregular contours on raw stones in the coarse grinding stage. The mixed 60/90 dual grit formula balances fast stock removal and uniform surface texture; coarser 60 grit delivers powerful cutting for heavy shaping work, while 90 grit refines surface marks to shorten subsequent medium and fine grinding procedures. Chemically inert and free of free iron contaminants, it will not leave dark stains or discoloration on light-colored jade, crystal and translucent gemstones, effectively protecting the original color and luster of rocks. With moderate particle toughness, it does not break down into excessive fine dust during long-cycle tumbling, extending service life and lowering overall processing costs. Widely used in rotary rock tumblers and vibration polishing barrels for rough shaping of jade, agate, quartz, obsidian and decorative mineral stones, it is the ideal coarse grinding media for rock tumbling workshops and jewelry processing factories.
Features:
- High hardness & sharp cutting edges, fast removal of stone rough surfaces and uneven edges
- 60/90 mixed grit balances high grinding efficiency and uniform surface finish
- Iron-free composition, no staining or discoloration on light jade and crystal
- Good particle toughness, low pulverization rate, long recycling service life
- Ideal coarse stage media for tumbling jade, agate, quartz and various mineral rocks
Physical properties of Black Silicon Carbide 60/90 Grit Rock Tumbling Polishing Media:
| 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 | 71-130 W/MK |
Typical chemical composition of Black Silicon Carbide 60/90 Grit Rock Tumbling Polishing Media:
| Chemical Item | Guarantee Value(%) | Typical Value(%) |
| SiC | ≥98.1% | 98.42 |
| Free C | ≤0.20 | 0.12 |
| Fe2O3 | ≤0.30 | 0.16 |
Particle size distribution of Black Silicon Carbide 60/90 Grit Rock Tumbling Polishing Media:
| Grit | Mesh# | Mesh size(um) | Weight Standard(%) | Typical Value(%) |
| Coarsest Grit | +50 | 300 | 0 | 0 |
| Coarse Grit | +70 | 212 | Max. 25 | 4.0 |
| Basic Grit | +80 | 180 | Min. 40 | 56.4 |
| Mixed Grit | +80 +100 | 180 150 | Min. 65 | 87.5 |
| Fine Grit | -120 | 125 | Max. 3 | 0.8 |
Application of Black Silicon Carbide 60/90 Grit Rock Tumbling Polishing Media:
- Sandblasting, etching, and carving of materials such as stone and marble.
- Surface cleaning and passivation of materials such as stainless steel semiconductor components and alloy steel.
- Ceramic products and electronic ceramics sandblasting and grinding.
- Polishing and grinding marble, granite, jade, jadeite, gemstones, etc.
- Glass artworks, glass products polishing and grinding, etc.
- Production of grinding tools such as grinding stones, steel paper sand discs, silicon carbide abrasive brushes, black diamond drawing wheels, sponge grinding blocks, and oilstones.
- Reaction-sintered silicon carbide ceramics: silicon carbide ceramic filters, silicon carbide ceramic membrane tubes, silicon carbide wear-resistant products, silicon carbide ceramic water pumps, bent pipes, silicon carbide wear-resistant plates, etc.
- Composite materials such as foam glass, modified resin, lubricating oil, anti-corrosion mastic, and other materials are added.
- Wear-resistant products such as brake pads, and wear-resistant sandpaper with added materials.
- Refractory materials such as silicon carbide refractory aggregates, and metallurgical carbonization materials.
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 |
Production of black silicon carbide：
Package：
FAQ:
Q: Is your company a manufacturer?
A: Yes, Haixu Abrasives is a manufacturer of black silicon carbide abrasives with over 20 years of production experience. The company also produces black silicon carbide sand, green silicon carbide micro powder, and green silicon carbide sand.
Q: What quality grades of black silicon carbide sand does your company produce?
A: Our company produces two qualities of black silicon carbide sand: unwashed and washed silicon carbide.
Q: Is black silicon carbide sand the same as black corundum?
A: Corundum is a general term for non-metallic abrasives. Black silicon carbide sand, also known as black corundum, is a type of artificial abrasive.
Q: What grade of black silicon carbide grinding sand does your company produce?
A: The raw material for the black silicon carbide sand produced by our company comes from first-grade black silicon carbide. Its silicon carbide purity is over 98%.
