JKINGS PRODUCTS
Black Aluminum Oxide Flap Disc
Product Description
Black Silicon Carbide Flap Discs - Hard & Brittle Material Specialist
Extreme Hardness for Non-Ferrous and Brittle Materials
Our Black Silicon Carbide (SiC) flap discs utilize the second-hardest synthetic abrasive (Mohs hardness 9.5, just below diamond). With extreme sharpness but controlled brittleness, these discs excel on materials that laugh at aluminum oxide—concrete, stone, glass, and hard cast iron. The "black fired" ceramic-grade SiC offers superior edge retention on brittle workpieces.
Key Features
- Black Silicon Carbide (98%+ SiC purity) for maximum hardness
- Extremely sharp crystalline structure cuts glass and stone without pressure
- Brittle fracture mechanism prevents loading on soft metals
- Ideal for grinding cast iron where Al₂O₃ loads and burns
- Conducts heat away from workpiece better than other abrasives
Technical Specifications
| Abrasive Grain | Black Silicon Carbide (Carborundum) - FEPA F grit |
| Hardness | Mohs 9.5 (vs 9.0 for Al₂O₃, 8.0 for Zirc) |
| Grain Shape | Needle-like, extremely sharp crystalline structure |
| Grit Sizes | 24 (extra coarse), 36, 40, 60, 80, 120, 180 (fine) |
| Diameter | 100mm, 115mm, 125mm, 150mm, 180mm |
| Backing | High-strength fiberglass (Black SiC generates less stress than cutting) |
| Best Speed | Medium speed (reduce RPM 15% vs steel grinding) |
Material-Specific Performance
Cast Iron: The classic choice. SiC's brittleness matches cast iron's brittleness, preventing the "gumming" that occurs with aluminum oxide.
Stone/Concrete: Excellent for smoothing concrete edges, shaping stone countertops, removing form marks.
Glass: For artistic edge work and smoothing cut glass edges (use water mist).
Hard Non-Ferrous: Tungsten carbide, ceramics, composites.
Critical Usage Warnings
DO NOT USE on soft steel or stainless steel. Black SiC will wear away 3-4x faster than Al₂O₃ on steel, wasting money. The sharp grains also embed in soft metals, causing rust points later. This is a specialty abrasive for hard/brittle materials only.
Unique Thermal Properties
Silicon carbide has higher thermal conductivity than other abrasives, meaning it draws heat away from the workpiece into the dust. This makes it safer for heat-sensitive glass and prevents thermal cracks in stone. However, the disc itself runs cooler, extending the resin bond life.
Detailed Applications
Automotive: Brake rotor finishing (cast iron). Construction: Concrete form cleaning, rebar grinding. Marine: Propeller deburring (bronze/brass). Art: Glass sculpting, ceramic finishing. Manufacturing: Titanium casting cleanup (intermittent contact).
Product Advantages
1. Cost-Effective Solution
Aluminium Oxide grains provide a balance of performance and affordability.
2. Consistent Grinding Performance
Even grain breakdown ensures smooth material removal.
3. Ideal for Light to Medium Grinding
Efficiently grinds mild steel, iron, and other ferrous metals.
4. Minimal Heat Build-Up
Reduces overheating for better surface finishing.
Applications
1. Metal Deburring
Smooths rough edges and removes burrs from steel and iron.
2. Surface Preparation
Prepares surfaces for painting, coating, or further finishing.
3. General Grinding & Polishing
Ideal for refining welds, shaping edges, and light stock removal.
4. Fabrication & Construction
Used in metal workshops, shipbuilding, and general manufacturing.
Black Aluminum Oxide Flap Disc
|
Diameter |
Grit Available |
PCS/BOX |
PCS/CTN |
M/S |
|
100x16 |
40#,60#,80#,100#,120# |
20 |
200 |
80m/s |
|
115x22.23 |
20 |
100 |
80m/s |
|
|
125x22.23 |
20 |
100 |
80m/s |
|
|
150x22.23 |
10 |
100 |
80m/s |
|
|
180x22.23 |
10 |
100 |
80m/s |
Certification
ONLINE MESSAGE
JKINGS is a global industrial brand committed to high-performance abrasives and tools. Built on advanced Industry 4.0 manufacturing and extensive OEM expertise, we deliver precision, durability, efficiency, and reliability for cutting, grinding, and beyond.
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