Silicon Carbide
Wafer slicing · GC800# – GC10000#
SiC ≥99.0% · Mohs hardness 9.5
WFA
White Corundum
Industrial alumina powder fused at high temperature, cooled, crystallised and crushed. White, dense and over 99% α-phase — high purity, high hardness and strong cutting power with excellent chemical stability and electrical insulation.
Al₂O₃ 99.81%Mohs hardness 9.0True density 3.90 g/cm³Melting point 2250 °C
Specification
Chemistry and physical properties
Typical production values. Batch certificates are issued against your own specification on request.
| Constituent | Value (%) |
|---|---|
| Al₂O₃ | 99.81 |
| Na₂O | 0.08 |
| SiO₂ | 0.02 |
| Fe₂O₃ | 0.01 |
| Form | Range |
|---|---|
| Grit sand | F16 – F80 (coarse) · F90 – F220 (fine) |
| Segment sand | 1–3 mm · 3–5 mm |
| Polishing sand | 240# · 280# and adjacent meshes |
| Micropowder | Narrow-distribution shaped micron powders |
| Property | Value |
|---|---|
| Crystal system | Trigonal |
| True density | 3.90 g/cm³ |
| Hardness | Knoop 2000–2200 kg/mm² · Mohs 9.0 |
| Colour | White (deep blue after calcination) |
| Melting point | 2250 °C |
| Max service temperature | 1900 °C |
| Specific heat | 0.26 Cal/g·°C (20–90 °C) |
| Refractive index | e = 1.760 · ω = 1.768 (Na line) |
| Linear expansion | (7–9) × 10⁻⁶ /K (0–1600 °C) |
Applications
Where WFA is used
- Piezoelectric crystal, semiconductor, stainless steel and aluminium precision lapping and polishing
- Sandblasting, polishing and lapping of metals and glass
- Filler for paints, coatings and ceramic glazes
- Oil stones, honing stones, grinding wheels, sandpaper and abrasive cloth
- Ceramic filter membranes, ceramic tubes and ceramic plates
- Polishing liquids, solid wax and liquid wax
- Wear-resistant flooring
Gallery
White Corundum in production
Also available
Other material families
Platelet Alumina
Scratch-free CMP · hexagonal platelets
Al₂O₃ 99.72% · Mohs hardness 9
Brown Fused Alumina
Tough workhorse · F4 – F320
Al₂O₃ 95.0–97.0% · Microhardness HV 1800–2200
Next step
Quote White Corundum to your specification
Tell us the grading standard, particle size band, chemistry limits and monthly tonnage for your WFA requirement and we will confirm the closest grade or quote a custom one.
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