Alpha Alumina (α-Al₂O₃)
High-purity alpha aluminum oxide powder — three purity grades, four particle-size ranges
Alumina (Al₂O₃) material overview
Alumina is a versatile engineering ceramic used across electronics, machinery, medical, laboratory and high-temperature systems. Khat Group supplies alpha aluminum oxide in multiple purity grades and supports custom tubes, rods, plates, substrates, insulators and machined components.
Key material advantages
- Excellent electrical insulation
- Good hardness and wear resistance
- Good chemical stability
- Wide range of purity and forming options
Common ceramic components
- Alumina tubes, rods and plates
- Ceramic insulators and spacers
- Substrates and heat-resistant parts
- Custom precision alumina components
Typical application fit
- Electrical insulation
- Wear and guide components
- Laboratory and furnace fixtures
- Semiconductor and industrial equipment
Grade system — three purities, four particle sizes
Alpha alumina is available in three purity levels and four particle-size ranges, giving twelve selectable grade combinations. Each grade carries a structured product code:
| Purity | > 80 µm | < 80 µm | < 20 µm | < 5 µm | < 1 µm (nano) |
|---|---|---|---|---|---|
| ≥ 99.5% | — | KG-ALO99-80 | KG-ALO99-20 | KG-ALO99-5 | KG-ALO99-nano |
| ≥ 98% | — | KG-ALO98-80 | KG-ALO98-20 | KG-ALO98-5 | KG-ALO98-nano |
| ≥ 95% | — | KG-ALO95-80 | KG-ALO95-20 | KG-ALO95-5 | KG-ALO95-nano |
High-purity grade — ≥ 99.5%
The high-purity series is intended for applications where minimal impurities, excellent dielectric performance and high sintered density are critical.
| Grade code | Purity | Particle size |
|---|---|---|
| KG-ALO99-80 | ≥ 99.5% | < 80 µm |
| KG-ALO99-20 | ≥ 99.5% | < 20 µm |
| KG-ALO99-5 | ≥ 99.5% | < 5 µm |
| KG-ALO99-nano | ≥ 99.5% | < 1 µm (submicron) |
Component-grade — ≥ 98%
The 98% series balances purity with cost and is suited to ceramic part fabrication (pressing, slip casting, extrusion, CIM) where good mechanical strength and insulation are required.
| Grade code | Purity | Particle size |
|---|---|---|
| KG-ALO98-80 | ≥ 98% | < 80 µm |
| KG-ALO98-20 | ≥ 98% | < 20 µm |
| KG-ALO98-5 | ≥ 98% | < 5 µm |
| KG-ALO98-nano | ≥ 98% | < 1 µm (submicron) |
Component-grade — ≥ 95%
The 95% series is intended for part fabrication where slightly lower strength is acceptable, offering a cost-effective option for general-purpose ceramic components.
| Grade code | Purity | Particle size |
|---|---|---|
| KG-ALO95-80 | ≥ 95% | < 80 µm |
| KG-ALO95-20 | ≥ 95% | < 20 µm |
| KG-ALO95-5 | ≥ 95% | < 5 µm |
| KG-ALO95-nano | ≥ 95% | < 1 µm (submicron) |
Why Khat Group?
- Technology license holder — member of Tehran University Science & Technology Park
- Expert team — Tehran University graduates with specialized materials engineering experience
- Grade flexibility — twelve selectable purity/particle-size combinations
- Competitive pricing — core principle of our commercial policy
- Standards compliance — products manufactured to customer-required specifications
Contact us for technical consultation, grade selection guidance, feasibility studies and quotations.
Specifications
| Material | Alpha Aluminum Oxide (α-Al₂O₃) |
|---|---|
| Chemical Formula | Al₂O₃ |
| CAS Number | 1344-28-1 |
| Crystal Structure | Corundum / Alpha |
| Purity Grades | ≥95%, ≥98%, ≥99.5% |
| Particle Sizes | <80 µm, <20 µm, <5 µm, <1 µm (nano) |
| Density | ~3.98 g/cm³ |
| Hardness | ~9 Mohs |
| Modulus of Elasticity | ~350–400 GPa |
| Flexural Strength | ~300–500 MPa (dense) |
| Compressive Strength | >2,000 MPa (dense) |
| Fracture Toughness | ~3–5 MPa·m½ |
| Dielectric Strength | ~10–15 kV/mm |
| Dielectric Constant | ~9–10 @ 1 MHz |
| Volume Resistivity | >10¹⁴ Ω·cm |
| Thermal Expansion (CTE) | ~8.0 × 10⁻⁶ K⁻¹ |
| Thermal Conductivity | ~25–35 W/m·K |
| Specific Heat Capacity | ~0.75–0.90 J/g·K |
| Max Working Temperature | ~1,700–1,800 °C |
| Refractive Index | ~1.76–1.77 |
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